diff --git a/doc/connectivity/bluetooth/api/mesh/blob_cli.rst b/doc/connectivity/bluetooth/api/mesh/blob_cli.rst
index 2232153f549..25b90c281c4 100644
--- a/doc/connectivity/bluetooth/api/mesh/blob_cli.rst
+++ b/doc/connectivity/bluetooth/api/mesh/blob_cli.rst
@@ -25,7 +25,7 @@ The BLOB Transfer Client is instantiated on an element with a set of event handl
          .cb = &blob_cb,
    };
 
-   static struct bt_mesh_model models[] = {
+   static const struct bt_mesh_model models[] = {
          BT_MESH_MODEL_BLOB_CLI(&blob_cli),
    };
 
diff --git a/doc/connectivity/bluetooth/api/mesh/blob_srv.rst b/doc/connectivity/bluetooth/api/mesh/blob_srv.rst
index a76ac34d6fb..918b9493ff9 100644
--- a/doc/connectivity/bluetooth/api/mesh/blob_srv.rst
+++ b/doc/connectivity/bluetooth/api/mesh/blob_srv.rst
@@ -35,7 +35,7 @@ The BLOB Transfer Server is instantiated on an element with a set of event handl
        .cb = &blob_cb,
    };
 
-   static struct bt_mesh_model models[] = {
+   static const struct bt_mesh_model models[] = {
        BT_MESH_MODEL_BLOB_SRV(&blob_srv),
    };
 
diff --git a/include/zephyr/bluetooth/mesh/access.h b/include/zephyr/bluetooth/mesh/access.h
index 5272abe5645..aa623549814 100644
--- a/include/zephyr/bluetooth/mesh/access.h
+++ b/include/zephyr/bluetooth/mesh/access.h
@@ -30,6 +30,13 @@
 #define BT_MESH_MODEL_UUIDS_UNASSIGNED()
 #endif
 
+#ifdef CONFIG_BT_MESH_MODEL_EXTENSIONS
+#define BT_MESH_MODEL_NEXT_UNASSIGNED()				\
+	.next = (const struct bt_mesh_model *[]){ NULL },
+#else
+#define BT_MESH_MODEL_NEXT_UNASSIGNED()
+#endif
+
 /**
  * @brief Access layer
  * @defgroup bt_mesh_access Access layer
@@ -159,9 +166,9 @@ struct bt_mesh_elem {
 	const uint8_t vnd_model_count;
 
 	/** The list of SIG models in this element */
-	struct bt_mesh_model * const models;
+	const struct bt_mesh_model * const models;
 	/** The list of vendor models in this element */
-	struct bt_mesh_model * const vnd_models;
+	const struct bt_mesh_model * const vnd_models;
 };
 
 /**
@@ -370,7 +377,7 @@ struct bt_mesh_model_op {
 	 *
 	 *  @return Zero on success or (negative) error code otherwise.
 	 */
-	int (*const func)(struct bt_mesh_model *model,
+	int (*const func)(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf);
 };
@@ -403,7 +410,7 @@ struct bt_mesh_model_op {
  * This macro uses compound literal feature of C99 standard and thus is available only from C,
  * not C++.
  */
-#define BT_MESH_MODEL_NONE ((struct bt_mesh_model []){})
+#define BT_MESH_MODEL_NONE ((const struct bt_mesh_model []){})
 
 /**
  *  @brief Composition data SIG model entry with callback functions
@@ -425,6 +432,9 @@ struct bt_mesh_model_op {
 #define BT_MESH_MODEL_CNT_CB(_id, _op, _pub, _user_data, _keys, _grps, _cb)	\
 {										\
 	.id = (_id),								\
+	.elem_idx = (uint8_t []) { 0 },						\
+	.mod_idx = (uint8_t []) { 0 },						\
+	.flags = (uint16_t []) { 0 },						\
 	.pub = _pub,								\
 	.keys = (uint16_t []) BT_MESH_MODEL_KEYS_UNUSED(_keys),			\
 	.keys_cnt = _keys,							\
@@ -433,7 +443,8 @@ struct bt_mesh_model_op {
 	BT_MESH_MODEL_UUIDS_UNASSIGNED()					\
 	.op = _op,								\
 	.cb = _cb,								\
-	.user_data = _user_data,						\
+	BT_MESH_MODEL_NEXT_UNASSIGNED()						\
+	.user_data = (void *[]){ _user_data },					\
 }
 
 /**
@@ -458,6 +469,9 @@ struct bt_mesh_model_op {
 {												\
 	.vnd.company = (_company),								\
 	.vnd.id = (_id),									\
+	.elem_idx = (uint8_t []) { 0 },								\
+	.mod_idx = (uint8_t []) { 0 },								\
+	.flags = (uint16_t []) { 0 },								\
 	.op = _op,										\
 	.pub = _pub,										\
 	.keys = (uint16_t []) BT_MESH_MODEL_KEYS_UNUSED(_keys),					\
@@ -465,7 +479,8 @@ struct bt_mesh_model_op {
 	.groups = (uint16_t []) BT_MESH_MODEL_GROUPS_UNASSIGNED(_grps),				\
 	.groups_cnt = _grps,									\
 	BT_MESH_MODEL_UUIDS_UNASSIGNED()							\
-	.user_data = _user_data,								\
+	BT_MESH_MODEL_NEXT_UNASSIGNED()								\
+	.user_data = (void *[]){ _user_data },							\
 	.cb = _cb,										\
 }
 
@@ -505,6 +520,9 @@ struct bt_mesh_model_op {
 #define BT_MESH_MODEL_METADATA_CB(_id, _op, _pub, _user_data, _cb, _metadata)                    \
 {                                                                            \
 	.id = (_id),                                                         \
+	.elem_idx = (uint8_t []) { 0 },					     \
+	.mod_idx = (uint8_t []) { 0 },					     \
+	.flags = (uint16_t []) { 0 },					     \
 	.pub = _pub,                                                         \
 	.keys = (uint16_t []) BT_MESH_MODEL_KEYS_UNUSED(CONFIG_BT_MESH_MODEL_KEY_COUNT), \
 	.keys_cnt = CONFIG_BT_MESH_MODEL_KEY_COUNT,                          \
@@ -513,7 +531,8 @@ struct bt_mesh_model_op {
 	BT_MESH_MODEL_UUIDS_UNASSIGNED()                                     \
 	.op = _op,                                                           \
 	.cb = _cb,                                                           \
-	.user_data = _user_data,                                             \
+	BT_MESH_MODEL_NEXT_UNASSIGNED()					     \
+	.user_data = (void *[]){ _user_data },				     \
 	.metadata = _metadata,                                               \
 }
 #else
@@ -559,6 +578,9 @@ struct bt_mesh_model_op {
 {                                                                            \
 	.vnd.company = (_company),                                           \
 	.vnd.id = (_id),                                                     \
+	.elem_idx = (uint8_t []) { 0 },					     \
+	.mod_idx = (uint8_t []) { 0 },					     \
+	.flags = (uint16_t []) { 0 },					     \
 	.op = _op,                                                           \
 	.pub = _pub,                                                         \
 	.keys = (uint16_t []) BT_MESH_MODEL_KEYS_UNUSED(CONFIG_BT_MESH_MODEL_KEY_COUNT), \
@@ -566,7 +588,8 @@ struct bt_mesh_model_op {
 	.groups = (uint16_t []) BT_MESH_MODEL_GROUPS_UNASSIGNED(CONFIG_BT_MESH_MODEL_GROUP_COUNT), \
 	.groups_cnt = CONFIG_BT_MESH_MODEL_GROUP_COUNT,                      \
 	BT_MESH_MODEL_UUIDS_UNASSIGNED()                                     \
-	.user_data = _user_data,                                             \
+	BT_MESH_MODEL_NEXT_UNASSIGNED()					     \
+	.user_data = (void *[]){ _user_data },				     \
 	.cb = _cb,                                                           \
 	.metadata = _metadata,                                               \
 }
@@ -690,7 +713,7 @@ struct bt_mesh_model_op {
  */
 struct bt_mesh_model_pub {
 	/** The model the context belongs to. Initialized by the stack. */
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	uint16_t addr;          /**< Publish Address. */
 	const uint8_t *uuid;    /**< Label UUID if Publish Address is Virtual Address. */
@@ -735,7 +758,7 @@ struct bt_mesh_model_pub {
 	 *
 	 *  @return Zero on success or (negative) error code otherwise.
 	 */
-	int (*update)(struct bt_mesh_model *mod);
+	int (*update)(const struct bt_mesh_model *mod);
 
 	/** Publish Period Timer. Only for stack-internal use. */
 	struct k_work_delayable timer;
@@ -805,7 +828,7 @@ struct bt_mesh_model_cb {
 	 *
 	 *  @return 0 on success, error otherwise.
 	 */
-	int (*const settings_set)(struct bt_mesh_model *model,
+	int (*const settings_set)(const struct bt_mesh_model *model,
 				  const char *name, size_t len_rd,
 				  settings_read_cb read_cb, void *cb_arg);
 
@@ -821,7 +844,7 @@ struct bt_mesh_model_cb {
 	 *
 	 *  @return 0 on success, error otherwise.
 	 */
-	int (*const start)(struct bt_mesh_model *model);
+	int (*const start)(const struct bt_mesh_model *model);
 
 	/** @brief Model init callback.
 	 *
@@ -835,7 +858,7 @@ struct bt_mesh_model_cb {
 	 *
 	 *  @return 0 on success, error otherwise.
 	 */
-	int (*const init)(struct bt_mesh_model *model);
+	int (*const init)(const struct bt_mesh_model *model);
 
 	/** @brief Model reset callback.
 	 *
@@ -847,7 +870,7 @@ struct bt_mesh_model_cb {
 	 *
 	 *  @param model Model this callback belongs to.
 	 */
-	void (*const reset)(struct bt_mesh_model *model);
+	void (*const reset)(const struct bt_mesh_model *model);
 
 	/** @brief Callback used to store pending model's user data.
 	 *
@@ -857,7 +880,7 @@ struct bt_mesh_model_cb {
 	 *
 	 *  @param model Model this callback belongs to.
 	 */
-	void (*const pending_store)(struct bt_mesh_model *model);
+	void (*const pending_store)(const struct bt_mesh_model *model);
 };
 
 /** Vendor model ID */
@@ -878,9 +901,9 @@ struct bt_mesh_model {
 	};
 
 	/* Internal information, mainly for persistent storage */
-	uint8_t  elem_idx;   /* Belongs to Nth element */
-	uint8_t  mod_idx;    /* Is the Nth model in the element */
-	uint16_t flags;      /* Model flags for internal bookkeeping */
+	uint8_t  * const elem_idx;   /* Belongs to Nth element */
+	uint8_t  * const mod_idx;    /* Is the Nth model in the element */
+	uint16_t * const flags;      /* Model flags for internal bookkeeping */
 
 	/** Model Publication */
 	struct bt_mesh_model_pub * const pub;
@@ -906,7 +929,7 @@ struct bt_mesh_model {
 
 #ifdef CONFIG_BT_MESH_MODEL_EXTENSIONS
 	/* Pointer to the next model in a model extension list. */
-	struct bt_mesh_model *next;
+	const struct bt_mesh_model ** const next;
 #endif
 
 #if defined(CONFIG_BT_MESH_LARGE_COMP_DATA_SRV) || defined(__DOXYGEN__)
@@ -915,7 +938,7 @@ struct bt_mesh_model {
 #endif
 
 	/** Model-specific user data */
-	void *user_data;
+	void ** const user_data;
 };
 
 /** Callback structure for monitoring model message sending */
@@ -952,7 +975,7 @@ struct bt_mesh_send_cb {
  *
  *  @return 0 on success, or (negative) error code on failure.
  */
-int bt_mesh_model_send(struct bt_mesh_model *model,
+int bt_mesh_model_send(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *msg,
 		       const struct bt_mesh_send_cb *cb,
@@ -971,7 +994,7 @@ int bt_mesh_model_send(struct bt_mesh_model *model,
  *
  *  @return 0 on success, or (negative) error code on failure.
  */
-int bt_mesh_model_publish(struct bt_mesh_model *model);
+int bt_mesh_model_publish(const struct bt_mesh_model *model);
 
 /** @brief Check if a message is being retransmitted.
  *
@@ -992,7 +1015,7 @@ static inline bool bt_mesh_model_pub_is_retransmission(const struct bt_mesh_mode
  *
  *  @return Pointer to the element that the given model belongs to.
  */
-struct bt_mesh_elem *bt_mesh_model_elem(struct bt_mesh_model *mod);
+struct bt_mesh_elem *bt_mesh_model_elem(const struct bt_mesh_model *mod);
 
 /** @brief Find a SIG model.
  *
@@ -1002,7 +1025,7 @@ struct bt_mesh_elem *bt_mesh_model_elem(struct bt_mesh_model *mod);
  *  @return A pointer to the Mesh model matching the given parameters, or NULL
  *          if no SIG model with the given ID exists in the given element.
  */
-struct bt_mesh_model *bt_mesh_model_find(const struct bt_mesh_elem *elem,
+const struct bt_mesh_model *bt_mesh_model_find(const struct bt_mesh_elem *elem,
 					 uint16_t id);
 
 /** @brief Find a vendor model.
@@ -1014,7 +1037,7 @@ struct bt_mesh_model *bt_mesh_model_find(const struct bt_mesh_elem *elem,
  *  @return A pointer to the Mesh model matching the given parameters, or NULL
  *          if no vendor model with the given ID exists in the given element.
  */
-struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
+const struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
 					     uint16_t company, uint16_t id);
 
 /** @brief Get whether the model is in the primary element of the device.
@@ -1025,7 +1048,7 @@ struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
  */
 static inline bool bt_mesh_model_in_primary(const struct bt_mesh_model *mod)
 {
-	return (mod->elem_idx == 0);
+	return (*(mod->elem_idx) == 0);
 }
 
 /** @brief Immediately store the model's user data in persistent storage.
@@ -1039,7 +1062,7 @@ static inline bool bt_mesh_model_in_primary(const struct bt_mesh_model *mod)
  *
  *  @return 0 on success, or (negative) error code on failure.
  */
-int bt_mesh_model_data_store(struct bt_mesh_model *mod, bool vnd,
+int bt_mesh_model_data_store(const struct bt_mesh_model *mod, bool vnd,
 			     const char *name, const void *data,
 			     size_t data_len);
 
@@ -1054,7 +1077,7 @@ int bt_mesh_model_data_store(struct bt_mesh_model *mod, bool vnd,
  *
  *  @param mod      Mesh model.
  */
-void bt_mesh_model_data_store_schedule(struct bt_mesh_model *mod);
+void bt_mesh_model_data_store_schedule(const struct bt_mesh_model *mod);
 
 /** @brief Let a model extend another.
  *
@@ -1079,8 +1102,8 @@ void bt_mesh_model_data_store_schedule(struct bt_mesh_model *mod);
  *
  *  @retval 0 Successfully extended the base_mod model.
  */
-int bt_mesh_model_extend(struct bt_mesh_model *extending_mod,
-			 struct bt_mesh_model *base_mod);
+int bt_mesh_model_extend(const struct bt_mesh_model *extending_mod,
+			 const struct bt_mesh_model *base_mod);
 
 /** @brief Let a model correspond to another.
  *
@@ -1102,8 +1125,8 @@ int bt_mesh_model_extend(struct bt_mesh_model *extending_mod,
  *  @retval -ENOTSUP  Composition Data Page 1 is not supported.
  */
 
-int bt_mesh_model_correspond(struct bt_mesh_model *corresponding_mod,
-			     struct bt_mesh_model *base_mod);
+int bt_mesh_model_correspond(const struct bt_mesh_model *corresponding_mod,
+			     const struct bt_mesh_model *base_mod);
 
 /** @brief Check if model is extended by another model.
  *
@@ -1111,7 +1134,7 @@ int bt_mesh_model_correspond(struct bt_mesh_model *corresponding_mod,
  *
  *  @retval true If model is extended by another model, otherwise false
  */
-bool bt_mesh_model_is_extended(struct bt_mesh_model *model);
+bool bt_mesh_model_is_extended(const struct bt_mesh_model *model);
 
 /** @brief Indicate that the composition data will change on next bootup.
  *
diff --git a/include/zephyr/bluetooth/mesh/blob_cli.h b/include/zephyr/bluetooth/mesh/blob_cli.h
index 3bf65beae39..8e239b31457 100644
--- a/include/zephyr/bluetooth/mesh/blob_cli.h
+++ b/include/zephyr/bluetooth/mesh/blob_cli.h
@@ -291,7 +291,7 @@ struct bt_mesh_blob_cli {
 	const struct bt_mesh_blob_cli_cb *cb;
 
 	/* Runtime state */
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	struct {
 		struct bt_mesh_blob_target *target;
diff --git a/include/zephyr/bluetooth/mesh/blob_srv.h b/include/zephyr/bluetooth/mesh/blob_srv.h
index 57237f1d4bb..bf807bad92f 100644
--- a/include/zephyr/bluetooth/mesh/blob_srv.h
+++ b/include/zephyr/bluetooth/mesh/blob_srv.h
@@ -136,7 +136,7 @@ struct bt_mesh_blob_srv {
 	const struct bt_mesh_blob_io *io;
 	struct k_work_delayable rx_timeout;
 	struct bt_mesh_blob_block block;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	enum bt_mesh_blob_xfer_phase phase;
 
 	struct bt_mesh_blob_srv_state {
diff --git a/include/zephyr/bluetooth/mesh/cfg_cli.h b/include/zephyr/bluetooth/mesh/cfg_cli.h
index 1a7c8ed7e2c..0e8c26131ff 100644
--- a/include/zephyr/bluetooth/mesh/cfg_cli.h
+++ b/include/zephyr/bluetooth/mesh/cfg_cli.h
@@ -332,7 +332,7 @@ struct bt_mesh_cfg_cli_cb {
 /** Mesh Configuration Client Model Context */
 struct bt_mesh_cfg_cli {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/** Optional callback for Mesh Configuration Client Status messages. */
 	const struct bt_mesh_cfg_cli_cb *cb;
diff --git a/include/zephyr/bluetooth/mesh/dfd_srv.h b/include/zephyr/bluetooth/mesh/dfd_srv.h
index 666e0d8ad3d..f15768080d7 100644
--- a/include/zephyr/bluetooth/mesh/dfd_srv.h
+++ b/include/zephyr/bluetooth/mesh/dfd_srv.h
@@ -210,7 +210,7 @@ struct bt_mesh_dfd_srv_cb {
 /** Firmware Distribution Server instance. */
 struct bt_mesh_dfd_srv {
 	const struct bt_mesh_dfd_srv_cb *cb;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_dfu_cli dfu;
 	struct bt_mesh_dfu_target targets[CONFIG_BT_MESH_DFD_SRV_TARGETS_MAX];
 	struct bt_mesh_blob_target_pull pull_ctxs[CONFIG_BT_MESH_DFD_SRV_TARGETS_MAX];
diff --git a/include/zephyr/bluetooth/mesh/dfu_cli.h b/include/zephyr/bluetooth/mesh/dfu_cli.h
index 51f534f2828..3cbc220d825 100644
--- a/include/zephyr/bluetooth/mesh/dfu_cli.h
+++ b/include/zephyr/bluetooth/mesh/dfu_cli.h
@@ -190,7 +190,7 @@ struct bt_mesh_dfu_cli {
 	/* runtime state */
 
 	uint32_t op;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	struct {
 		const struct bt_mesh_dfu_slot *slot;
diff --git a/include/zephyr/bluetooth/mesh/dfu_srv.h b/include/zephyr/bluetooth/mesh/dfu_srv.h
index 53d9144713c..e136701e664 100644
--- a/include/zephyr/bluetooth/mesh/dfu_srv.h
+++ b/include/zephyr/bluetooth/mesh/dfu_srv.h
@@ -184,7 +184,7 @@ struct bt_mesh_dfu_srv {
 	size_t img_count;
 
 	/* Runtime state */
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct {
 		/* Effect of transfer, @see bt_mesh_dfu_effect. */
 		uint8_t effect;
diff --git a/include/zephyr/bluetooth/mesh/health_cli.h b/include/zephyr/bluetooth/mesh/health_cli.h
index 2f13dd88ccf..2d8904ea6f2 100644
--- a/include/zephyr/bluetooth/mesh/health_cli.h
+++ b/include/zephyr/bluetooth/mesh/health_cli.h
@@ -26,7 +26,7 @@ extern "C" {
 /** Health Client Model Context */
 struct bt_mesh_health_cli {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/** Publication structure instance */
 	struct bt_mesh_model_pub pub;
diff --git a/include/zephyr/bluetooth/mesh/health_srv.h b/include/zephyr/bluetooth/mesh/health_srv.h
index 9665e3bc62a..bb1e48004b9 100644
--- a/include/zephyr/bluetooth/mesh/health_srv.h
+++ b/include/zephyr/bluetooth/mesh/health_srv.h
@@ -53,7 +53,7 @@ struct bt_mesh_health_srv_cb {
 	 *
 	 *  @return 0 on success, or (negative) error code otherwise.
 	 */
-	int (*fault_get_cur)(struct bt_mesh_model *model, uint8_t *test_id,
+	int (*fault_get_cur)(const struct bt_mesh_model *model, uint8_t *test_id,
 			     uint16_t *company_id, uint8_t *faults,
 			     uint8_t *fault_count);
 
@@ -79,7 +79,7 @@ struct bt_mesh_health_srv_cb {
 	 *
 	 *  @return 0 on success, or (negative) error code otherwise.
 	 */
-	int (*fault_get_reg)(struct bt_mesh_model *model, uint16_t company_id,
+	int (*fault_get_reg)(const struct bt_mesh_model *model, uint16_t company_id,
 			     uint8_t *test_id, uint8_t *faults,
 			     uint8_t *fault_count);
 
@@ -91,7 +91,7 @@ struct bt_mesh_health_srv_cb {
 	 *
 	 *  @return 0 on success, or (negative) error code otherwise.
 	 */
-	int (*fault_clear)(struct bt_mesh_model *model, uint16_t company_id);
+	int (*fault_clear)(const struct bt_mesh_model *model, uint16_t company_id);
 
 	/** @brief Run a self-test.
 	 *
@@ -108,7 +108,7 @@ struct bt_mesh_health_srv_cb {
 	 * (negative) error code otherwise. Note that the fault array will not
 	 * be reported back to the client if the test execution didn't start.
 	 */
-	int (*fault_test)(struct bt_mesh_model *model, uint8_t test_id,
+	int (*fault_test)(const struct bt_mesh_model *model, uint8_t test_id,
 			  uint16_t company_id);
 
 	/** @brief Start calling attention to the device.
@@ -125,7 +125,7 @@ struct bt_mesh_health_srv_cb {
 	 *
 	 *  @param model Health Server model to start the attention state of.
 	 */
-	void (*attn_on)(struct bt_mesh_model *model);
+	void (*attn_on)(const struct bt_mesh_model *model);
 
 	/** @brief Stop the attention state.
 	 *
@@ -134,7 +134,7 @@ struct bt_mesh_health_srv_cb {
 	 *
 	 *  @param model
 	 */
-	void (*attn_off)(struct bt_mesh_model *model);
+	void (*attn_off)(const struct bt_mesh_model *model);
 };
 
 /**
@@ -149,7 +149,7 @@ struct bt_mesh_health_srv_cb {
 /** Mesh Health Server Model Context */
 struct bt_mesh_health_srv {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/** Optional callback struct */
 	const struct bt_mesh_health_srv_cb *cb;
diff --git a/include/zephyr/bluetooth/mesh/large_comp_data_cli.h b/include/zephyr/bluetooth/mesh/large_comp_data_cli.h
index b7ed0776204..520fcb3a6b5 100644
--- a/include/zephyr/bluetooth/mesh/large_comp_data_cli.h
+++ b/include/zephyr/bluetooth/mesh/large_comp_data_cli.h
@@ -69,7 +69,7 @@ struct bt_mesh_large_comp_data_cli_cb {
 /** Large Composition Data Client model context */
 struct bt_mesh_large_comp_data_cli {
 	/** Model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/** Internal parameters for tracking message responses. */
 	struct bt_mesh_msg_ack_ctx ack_ctx;
diff --git a/include/zephyr/bluetooth/mesh/od_priv_proxy_cli.h b/include/zephyr/bluetooth/mesh/od_priv_proxy_cli.h
index f9734d78d3e..0234158b046 100644
--- a/include/zephyr/bluetooth/mesh/od_priv_proxy_cli.h
+++ b/include/zephyr/bluetooth/mesh/od_priv_proxy_cli.h
@@ -22,7 +22,7 @@ extern "C" {
 /** On-Demand Private Proxy Client Model Context */
 struct bt_mesh_od_priv_proxy_cli {
 	/** Solicitation PDU RPL model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/* Internal parameters for tracking message responses. */
 	struct bt_mesh_msg_ack_ctx ack_ctx;
diff --git a/include/zephyr/bluetooth/mesh/priv_beacon_cli.h b/include/zephyr/bluetooth/mesh/priv_beacon_cli.h
index 835dc38c773..24fba6f67be 100644
--- a/include/zephyr/bluetooth/mesh/priv_beacon_cli.h
+++ b/include/zephyr/bluetooth/mesh/priv_beacon_cli.h
@@ -90,7 +90,7 @@ struct bt_mesh_priv_beacon_cli_cb {
 
 /** Mesh Private Beacon Client model */
 struct bt_mesh_priv_beacon_cli {
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/* Internal parameters for tracking message responses. */
 	struct bt_mesh_msg_ack_ctx ack_ctx;
diff --git a/include/zephyr/bluetooth/mesh/rpr_cli.h b/include/zephyr/bluetooth/mesh/rpr_cli.h
index 5c0374fecc3..414e2887bdf 100644
--- a/include/zephyr/bluetooth/mesh/rpr_cli.h
+++ b/include/zephyr/bluetooth/mesh/rpr_cli.h
@@ -91,7 +91,7 @@ struct bt_mesh_rpr_cli {
 		enum bt_mesh_rpr_link_state state;
 	} link;
 
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 };
 
 /** @brief Get scanning capabilities of Remote Provisioning Server.
diff --git a/include/zephyr/bluetooth/mesh/sar_cfg_cli.h b/include/zephyr/bluetooth/mesh/sar_cfg_cli.h
index 7882174512e..5e8409d3841 100644
--- a/include/zephyr/bluetooth/mesh/sar_cfg_cli.h
+++ b/include/zephyr/bluetooth/mesh/sar_cfg_cli.h
@@ -27,7 +27,7 @@ extern "C" {
 /** Mesh SAR Configuration Client Model Context */
 struct bt_mesh_sar_cfg_cli {
 	/** Access model pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/* Publication structure instance */
 	struct bt_mesh_model_pub pub;
diff --git a/include/zephyr/bluetooth/mesh/sol_pdu_rpl_cli.h b/include/zephyr/bluetooth/mesh/sol_pdu_rpl_cli.h
index 5a3dcdd784d..5a6c49bd211 100644
--- a/include/zephyr/bluetooth/mesh/sol_pdu_rpl_cli.h
+++ b/include/zephyr/bluetooth/mesh/sol_pdu_rpl_cli.h
@@ -22,7 +22,7 @@ extern "C" {
 /** Solicitation PDU RPL Client Model Context */
 struct bt_mesh_sol_pdu_rpl_cli {
 	/** Solicitation PDU RPL model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 
 	/* Internal parameters for tracking message responses. */
 	struct bt_mesh_msg_ack_ctx ack_ctx;
diff --git a/include/zephyr/bluetooth/testing.h b/include/zephyr/bluetooth/testing.h
index 9cfda4e1177..58aae9726ff 100644
--- a/include/zephyr/bluetooth/testing.h
+++ b/include/zephyr/bluetooth/testing.h
@@ -39,9 +39,9 @@ struct bt_test_cb {
 			      const void *payload, size_t payload_len);
 	void (*mesh_model_recv)(uint16_t src, uint16_t dst, const void *payload,
 				size_t payload_len);
-	void (*mesh_model_bound)(uint16_t addr, struct bt_mesh_model *model,
+	void (*mesh_model_bound)(uint16_t addr, const struct bt_mesh_model *model,
 				 uint16_t key_idx);
-	void (*mesh_model_unbound)(uint16_t addr, struct bt_mesh_model *model,
+	void (*mesh_model_unbound)(uint16_t addr, const struct bt_mesh_model *model,
 				   uint16_t key_idx);
 	void (*mesh_prov_invalid_bearer)(uint8_t opcode);
 	void (*mesh_trans_incomp_timer_exp)(void);
diff --git a/samples/bluetooth/mesh/src/main.c b/samples/bluetooth/mesh/src/main.c
index 6914c4fc409..5555edef9bb 100644
--- a/samples/bluetooth/mesh/src/main.c
+++ b/samples/bluetooth/mesh/src/main.c
@@ -25,12 +25,12 @@
 #define OP_ONOFF_SET_UNACK BT_MESH_MODEL_OP_2(0x82, 0x03)
 #define OP_ONOFF_STATUS    BT_MESH_MODEL_OP_2(0x82, 0x04)
 
-static void attention_on(struct bt_mesh_model *mod)
+static void attention_on(const struct bt_mesh_model *mod)
 {
 	board_led_set(true);
 }
 
-static void attention_off(struct bt_mesh_model *mod)
+static void attention_off(const struct bt_mesh_model *mod)
 {
 	board_led_set(false);
 }
@@ -102,7 +102,7 @@ static inline uint8_t model_time_encode(int32_t ms)
 	return 0x3f;
 }
 
-static int onoff_status_send(struct bt_mesh_model *model,
+static int onoff_status_send(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx)
 {
 	uint32_t remaining;
@@ -151,7 +151,7 @@ static void onoff_timeout(struct k_work *work)
 
 /* Generic OnOff Server message handlers */
 
-static int gen_onoff_get(struct bt_mesh_model *model,
+static int gen_onoff_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -159,7 +159,7 @@ static int gen_onoff_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set_unack(struct bt_mesh_model *model,
+static int gen_onoff_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -202,7 +202,7 @@ static int gen_onoff_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set(struct bt_mesh_model *model,
+static int gen_onoff_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -221,7 +221,7 @@ static const struct bt_mesh_model_op gen_onoff_srv_op[] = {
 
 /* Generic OnOff Client */
 
-static int gen_onoff_status(struct bt_mesh_model *model,
+static int gen_onoff_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -248,7 +248,7 @@ static const struct bt_mesh_model_op gen_onoff_cli_op[] = {
 };
 
 /* This application only needs one element to contain its models */
-static struct bt_mesh_model models[] = {
+static const struct bt_mesh_model models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_SRV, gen_onoff_srv_op, NULL,
diff --git a/samples/bluetooth/mesh_demo/src/main.c b/samples/bluetooth/mesh_demo/src/main.c
index 642cce1d18e..08d6a1aae9b 100644
--- a/samples/bluetooth/mesh_demo/src/main.c
+++ b/samples/bluetooth/mesh_demo/src/main.c
@@ -50,14 +50,14 @@ static void heartbeat(const struct bt_mesh_hb_sub *sub, uint8_t hops,
 static struct bt_mesh_cfg_cli cfg_cli = {
 };
 
-static void attention_on(struct bt_mesh_model *model)
+static void attention_on(const struct bt_mesh_model *model)
 {
 	printk("attention_on()\n");
 	board_attention(true);
 	board_play("100H100C100H100C100H100C");
 }
 
-static void attention_off(struct bt_mesh_model *model)
+static void attention_off(const struct bt_mesh_model *model)
 {
 	printk("attention_off()\n");
 	board_attention(false);
@@ -74,13 +74,13 @@ static struct bt_mesh_health_srv health_srv = {
 
 BT_MESH_HEALTH_PUB_DEFINE(health_pub, 0);
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
 };
 
-static int vnd_button_pressed(struct bt_mesh_model *model,
+static int vnd_button_pressed(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -101,7 +101,7 @@ static const struct bt_mesh_model_op vnd_ops[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static struct bt_mesh_model vnd_models[] = {
+static const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND(BT_COMP_ID_LF, MOD_LF, vnd_ops, NULL, NULL),
 };
 
diff --git a/samples/bluetooth/mesh_provisioner/src/main.c b/samples/bluetooth/mesh_provisioner/src/main.c
index 42eaa31207b..057087a2e8a 100644
--- a/samples/bluetooth/mesh_provisioner/src/main.c
+++ b/samples/bluetooth/mesh_provisioner/src/main.c
@@ -53,7 +53,7 @@ static struct bt_mesh_health_cli health_cli = {
 	.current_status = health_current_status,
 };
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_CLI(&health_cli),
diff --git a/samples/boards/nrf/mesh/onoff-app/src/main.c b/samples/boards/nrf/mesh/onoff-app/src/main.c
index 9e8788d4642..817d2c023a6 100644
--- a/samples/boards/nrf/mesh/onoff-app/src/main.c
+++ b/samples/boards/nrf/mesh/onoff-app/src/main.c
@@ -54,19 +54,19 @@
 #define BT_MESH_MODEL_OP_GEN_ONOFF_SET_UNACK	BT_MESH_MODEL_OP_2(0x82, 0x03)
 #define BT_MESH_MODEL_OP_GEN_ONOFF_STATUS	BT_MESH_MODEL_OP_2(0x82, 0x04)
 
-static int gen_onoff_set(struct bt_mesh_model *model,
+static int gen_onoff_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf);
 
-static int gen_onoff_set_unack(struct bt_mesh_model *model,
+static int gen_onoff_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf);
 
-static int gen_onoff_get(struct bt_mesh_model *model,
+static int gen_onoff_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf);
 
-static int gen_onoff_status(struct bt_mesh_model *model,
+static int gen_onoff_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf);
 
@@ -167,7 +167,7 @@ static struct led_onoff_state led_onoff_states[] = {
  * Element 0 Root Models
  */
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
@@ -181,7 +181,7 @@ static struct bt_mesh_model root_models[] = {
  * Element 1 Models
  */
 
-static struct bt_mesh_model secondary_0_models[] = {
+static const struct bt_mesh_model secondary_0_models[] = {
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_SRV, gen_onoff_srv_op,
 		      &gen_onoff_pub_srv_s_0, &led_onoff_states[1]),
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_CLI, gen_onoff_cli_op,
@@ -192,7 +192,7 @@ static struct bt_mesh_model secondary_0_models[] = {
  * Element 2 Models
  */
 
-static struct bt_mesh_model secondary_1_models[] = {
+static const struct bt_mesh_model secondary_1_models[] = {
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_SRV, gen_onoff_srv_op,
 		      &gen_onoff_pub_srv_s_1, &led_onoff_states[2]),
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_CLI, gen_onoff_cli_op,
@@ -203,7 +203,7 @@ static struct bt_mesh_model secondary_1_models[] = {
  * Element 3 Models
  */
 
-static struct bt_mesh_model secondary_2_models[] = {
+static const struct bt_mesh_model secondary_2_models[] = {
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_SRV, gen_onoff_srv_op,
 		      &gen_onoff_pub_srv_s_2, &led_onoff_states[3]),
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_ONOFF_CLI, gen_onoff_cli_op,
@@ -214,7 +214,7 @@ static struct bt_mesh_model secondary_2_models[] = {
  * Button to Client Model Assignments
  */
 
-struct bt_mesh_model *mod_cli_sw[] = {
+const struct bt_mesh_model *mod_cli_sw[] = {
 		&root_models[4],
 		&secondary_0_models[1],
 		&secondary_1_models[1],
@@ -225,7 +225,7 @@ struct bt_mesh_model *mod_cli_sw[] = {
  * LED to Server Model Assignments
  */
 
-struct bt_mesh_model *mod_srv_sw[] = {
+const struct bt_mesh_model *mod_srv_sw[] = {
 		&root_models[3],
 		&secondary_0_models[0],
 		&secondary_1_models[0],
@@ -281,12 +281,12 @@ static uint16_t primary_net_idx;
  *
  */
 
-static int gen_onoff_get(struct bt_mesh_model *model,
+static int gen_onoff_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(msg, 2 + 1 + 4);
-	struct led_onoff_state *onoff_state = model->user_data;
+	struct led_onoff_state *onoff_state = *(model->user_data);
 
 	printk("addr 0x%04x onoff 0x%02x\n",
 	       bt_mesh_model_elem(model)->addr, onoff_state->current);
@@ -300,12 +300,12 @@ static int gen_onoff_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set_unack(struct bt_mesh_model *model,
+static int gen_onoff_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
 	struct net_buf_simple *msg = model->pub->msg;
-	struct led_onoff_state *onoff_state = model->user_data;
+	struct led_onoff_state *onoff_state = *(model->user_data);
 	int err;
 
 	onoff_state->current = net_buf_simple_pull_u8(buf);
@@ -340,7 +340,7 @@ static int gen_onoff_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set(struct bt_mesh_model *model,
+static int gen_onoff_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -352,7 +352,7 @@ static int gen_onoff_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_status(struct bt_mesh_model *model,
+static int gen_onoff_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -465,7 +465,7 @@ static void button_cnt_timer(struct k_timer *work)
 
 static void button_pressed_worker(struct k_work *work)
 {
-	struct bt_mesh_model *mod_cli, *mod_srv;
+	const struct bt_mesh_model *mod_cli, *mod_srv;
 	struct bt_mesh_model_pub *pub_cli, *pub_srv;
 	struct switch_data *button_sw = CONTAINER_OF(work, struct switch_data, button_work);
 	int err;
diff --git a/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.c b/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.c
index 2cf7abc3048..54a5a2c8af7 100644
--- a/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.c
+++ b/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.c
@@ -68,7 +68,7 @@ static struct bt_mesh_elem elements[];
 /* message handlers (Start) */
 
 /* Generic OnOff Server message handlers */
-static int gen_onoff_get(struct bt_mesh_model *model,
+static int gen_onoff_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -95,7 +95,7 @@ send:
 	return 0;
 }
 
-void gen_onoff_publish(struct bt_mesh_model *model)
+void gen_onoff_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -119,7 +119,7 @@ void gen_onoff_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int gen_onoff_set_unack(struct bt_mesh_model *model,
+static int gen_onoff_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -188,7 +188,7 @@ static int gen_onoff_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set(struct bt_mesh_model *model,
+static int gen_onoff_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -261,7 +261,7 @@ static int gen_onoff_set(struct bt_mesh_model *model,
 }
 
 /* Generic OnOff Client message handlers */
-static int gen_onoff_status(struct bt_mesh_model *model,
+static int gen_onoff_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -277,7 +277,7 @@ static int gen_onoff_status(struct bt_mesh_model *model,
 }
 
 /* Generic Level (LIGHTNESS) Server message handlers */
-static int gen_level_get(struct bt_mesh_model *model,
+static int gen_level_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -304,7 +304,7 @@ send:
 	return 0;
 }
 
-void gen_level_publish(struct bt_mesh_model *model)
+void gen_level_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -328,7 +328,7 @@ void gen_level_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int gen_level_set_unack(struct bt_mesh_model *model,
+static int gen_level_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -394,7 +394,7 @@ static int gen_level_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_level_set(struct bt_mesh_model *model,
+static int gen_level_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -463,7 +463,7 @@ static int gen_level_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_delta_set_unack(struct bt_mesh_model *model,
+static int gen_delta_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -545,7 +545,7 @@ static int gen_delta_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_delta_set(struct bt_mesh_model *model,
+static int gen_delta_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -630,7 +630,7 @@ static int gen_delta_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_move_set_unack(struct bt_mesh_model *model,
+static int gen_move_set_unack(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -705,7 +705,7 @@ static int gen_move_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_move_set(struct bt_mesh_model *model,
+static int gen_move_set(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf)
 {
 	uint8_t tid, tt, delay;
@@ -783,7 +783,7 @@ static int gen_move_set(struct bt_mesh_model *model,
 }
 
 /* Generic Level Client message handlers */
-static int gen_level_status(struct bt_mesh_model *model,
+static int gen_level_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -799,7 +799,7 @@ static int gen_level_status(struct bt_mesh_model *model,
 }
 
 /* Generic Default Transition Time Server message handlers */
-static int gen_def_trans_time_get(struct bt_mesh_model *model,
+static int gen_def_trans_time_get(const struct bt_mesh_model *model,
 				  struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
@@ -815,7 +815,7 @@ static int gen_def_trans_time_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static void gen_def_trans_time_publish(struct bt_mesh_model *model)
+static void gen_def_trans_time_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -833,7 +833,7 @@ static void gen_def_trans_time_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int gen_def_trans_time_set_unack(struct bt_mesh_model *model,
+static int gen_def_trans_time_set_unack(const struct bt_mesh_model *model,
 					struct bt_mesh_msg_ctx *ctx,
 					struct net_buf_simple *buf)
 {
@@ -855,7 +855,7 @@ static int gen_def_trans_time_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_def_trans_time_set(struct bt_mesh_model *model,
+static int gen_def_trans_time_set(const struct bt_mesh_model *model,
 				  struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
@@ -881,7 +881,7 @@ static int gen_def_trans_time_set(struct bt_mesh_model *model,
 }
 
 /* Generic Default Transition Time Client message handlers */
-static int gen_def_trans_time_status(struct bt_mesh_model *model,
+static int gen_def_trans_time_status(const struct bt_mesh_model *model,
 				     struct bt_mesh_msg_ctx *ctx,
 				     struct net_buf_simple *buf)
 {
@@ -892,7 +892,7 @@ static int gen_def_trans_time_status(struct bt_mesh_model *model,
 }
 
 /* Generic Power OnOff Server message handlers */
-static int gen_onpowerup_get(struct bt_mesh_model *model,
+static int gen_onpowerup_get(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -909,7 +909,7 @@ static int gen_onpowerup_get(struct bt_mesh_model *model,
 }
 
 /* Generic Power OnOff Client message handlers */
-static int gen_onpowerup_status(struct bt_mesh_model *model,
+static int gen_onpowerup_status(const struct bt_mesh_model *model,
 				struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
@@ -921,7 +921,7 @@ static int gen_onpowerup_status(struct bt_mesh_model *model,
 
 /* Generic Power OnOff Setup Server message handlers */
 
-static void gen_onpowerup_publish(struct bt_mesh_model *model)
+static void gen_onpowerup_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -939,7 +939,7 @@ static void gen_onpowerup_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int gen_onpowerup_set_unack(struct bt_mesh_model *model,
+static int gen_onpowerup_set_unack(const struct bt_mesh_model *model,
 				   struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
@@ -961,7 +961,7 @@ static int gen_onpowerup_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onpowerup_set(struct bt_mesh_model *model,
+static int gen_onpowerup_set(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -987,11 +987,11 @@ static int gen_onpowerup_set(struct bt_mesh_model *model,
 }
 
 /* Vendor Model message handlers*/
-static int vnd_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int vnd_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		   struct net_buf_simple *buf)
 {
 	struct net_buf_simple *msg = NET_BUF_SIMPLE(3 + 6 + 4);
-	struct vendor_state *state = model->user_data;
+	struct vendor_state *state = *(model->user_data);
 
 	/* This is dummy response for demo purpose */
 	state->response = 0xA578FEB3;
@@ -1007,14 +1007,14 @@ static int vnd_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int vnd_set_unack(struct bt_mesh_model *model,
+static int vnd_set_unack(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
 	uint8_t tid;
 	int current;
 	int64_t now;
-	struct vendor_state *state = model->user_data;
+	struct vendor_state *state = *(model->user_data);
 
 	current = net_buf_simple_pull_le16(buf);
 	tid = net_buf_simple_pull_u8(buf);
@@ -1040,7 +1040,7 @@ static int vnd_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int vnd_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int vnd_set(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		   struct net_buf_simple *buf)
 {
 	(void)vnd_set_unack(model, ctx, buf);
@@ -1049,7 +1049,7 @@ static int vnd_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int vnd_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int vnd_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
 	printk("Acknowledgement from Vendor\n");
@@ -1060,7 +1060,7 @@ static int vnd_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 }
 
 /* Light Lightness Server message handlers */
-static int light_lightness_get(struct bt_mesh_model *model,
+static int light_lightness_get(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -1087,7 +1087,7 @@ send:
 	return 0;
 }
 
-void light_lightness_publish(struct bt_mesh_model *model)
+void light_lightness_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1111,7 +1111,7 @@ void light_lightness_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_lightness_set_unack(struct bt_mesh_model *model,
+static int light_lightness_set_unack(const struct bt_mesh_model *model,
 				     struct bt_mesh_msg_ctx *ctx,
 				     struct net_buf_simple *buf)
 {
@@ -1177,7 +1177,7 @@ static int light_lightness_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_set(struct bt_mesh_model *model,
+static int light_lightness_set(const struct bt_mesh_model *model,
 				struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
@@ -1246,7 +1246,7 @@ static int light_lightness_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_linear_get(struct bt_mesh_model *model,
+static int light_lightness_linear_get(const struct bt_mesh_model *model,
 				      struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
@@ -1274,7 +1274,7 @@ send:
 	return 0;
 }
 
-void light_lightness_linear_publish(struct bt_mesh_model *model)
+void light_lightness_linear_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1299,7 +1299,7 @@ void light_lightness_linear_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_lightness_linear_set_unack(struct bt_mesh_model *model,
+static int light_lightness_linear_set_unack(const struct bt_mesh_model *model,
 					    struct bt_mesh_msg_ctx *ctx,
 					    struct net_buf_simple *buf)
 {
@@ -1365,7 +1365,7 @@ static int light_lightness_linear_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_linear_set(struct bt_mesh_model *model,
+static int light_lightness_linear_set(const struct bt_mesh_model *model,
 				      struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
@@ -1434,7 +1434,7 @@ static int light_lightness_linear_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_last_get(struct bt_mesh_model *model,
+static int light_lightness_last_get(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -1450,7 +1450,7 @@ static int light_lightness_last_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_default_get(struct bt_mesh_model *model,
+static int light_lightness_default_get(const struct bt_mesh_model *model,
 				       struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
@@ -1467,7 +1467,7 @@ static int light_lightness_default_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_range_get(struct bt_mesh_model *model,
+static int light_lightness_range_get(const struct bt_mesh_model *model,
 				     struct bt_mesh_msg_ctx *ctx,
 				     struct net_buf_simple *buf)
 {
@@ -1489,7 +1489,7 @@ static int light_lightness_range_get(struct bt_mesh_model *model,
 
 /* Light Lightness Setup Server message handlers */
 
-static void light_lightness_default_publish(struct bt_mesh_model *model)
+static void light_lightness_default_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1508,7 +1508,7 @@ static void light_lightness_default_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_lightness_default_set_unack(struct bt_mesh_model *model,
+static int light_lightness_default_set_unack(const struct bt_mesh_model *model,
 					     struct bt_mesh_msg_ctx *ctx,
 					     struct net_buf_simple *buf)
 {
@@ -1527,7 +1527,7 @@ static int light_lightness_default_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_default_set(struct bt_mesh_model *model,
+static int light_lightness_default_set(const struct bt_mesh_model *model,
 				       struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
@@ -1549,7 +1549,7 @@ static int light_lightness_default_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static void light_lightness_range_publish(struct bt_mesh_model *model)
+static void light_lightness_range_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1569,7 +1569,7 @@ static void light_lightness_range_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_lightness_range_set_unack(struct bt_mesh_model *model,
+static int light_lightness_range_set_unack(const struct bt_mesh_model *model,
 					   struct bt_mesh_msg_ctx *ctx,
 					   struct net_buf_simple *buf)
 {
@@ -1603,7 +1603,7 @@ static int light_lightness_range_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_range_set(struct bt_mesh_model *model,
+static int light_lightness_range_set(const struct bt_mesh_model *model,
 				     struct bt_mesh_msg_ctx *ctx,
 				     struct net_buf_simple *buf)
 {
@@ -1641,7 +1641,7 @@ static int light_lightness_range_set(struct bt_mesh_model *model,
 }
 
 /* Light Lightness Client message handlers */
-static int light_lightness_status(struct bt_mesh_model *model,
+static int light_lightness_status(const struct bt_mesh_model *model,
 				  struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
@@ -1657,7 +1657,7 @@ static int light_lightness_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_linear_status(struct bt_mesh_model *model,
+static int light_lightness_linear_status(const struct bt_mesh_model *model,
 					 struct bt_mesh_msg_ctx *ctx,
 					 struct net_buf_simple *buf)
 {
@@ -1673,7 +1673,7 @@ static int light_lightness_linear_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_last_status(struct bt_mesh_model *model,
+static int light_lightness_last_status(const struct bt_mesh_model *model,
 				       struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
@@ -1683,7 +1683,7 @@ static int light_lightness_last_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_default_status(struct bt_mesh_model *model,
+static int light_lightness_default_status(const struct bt_mesh_model *model,
 					  struct bt_mesh_msg_ctx *ctx,
 					  struct net_buf_simple *buf)
 {
@@ -1693,7 +1693,7 @@ static int light_lightness_default_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_lightness_range_status(struct bt_mesh_model *model,
+static int light_lightness_range_status(const struct bt_mesh_model *model,
 					struct bt_mesh_msg_ctx *ctx,
 					struct net_buf_simple *buf)
 {
@@ -1706,7 +1706,7 @@ static int light_lightness_range_status(struct bt_mesh_model *model,
 }
 
 /* Light CTL Server message handlers */
-static int light_ctl_get(struct bt_mesh_model *model,
+static int light_ctl_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -1736,7 +1736,7 @@ send:
 	return 0;
 }
 
-void light_ctl_publish(struct bt_mesh_model *model)
+void light_ctl_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1766,7 +1766,7 @@ void light_ctl_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_ctl_set_unack(struct bt_mesh_model *model,
+static int light_ctl_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -1845,7 +1845,7 @@ static int light_ctl_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_set(struct bt_mesh_model *model,
+static int light_ctl_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -1927,7 +1927,7 @@ static int light_ctl_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_temp_range_get(struct bt_mesh_model *model,
+static int light_ctl_temp_range_get(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -1947,7 +1947,7 @@ static int light_ctl_temp_range_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_default_get(struct bt_mesh_model *model,
+static int light_ctl_default_get(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -1967,7 +1967,7 @@ static int light_ctl_default_get(struct bt_mesh_model *model,
 
 /* Light CTL Setup Server message handlers */
 
-static void light_ctl_default_publish(struct bt_mesh_model *model)
+static void light_ctl_default_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -1987,7 +1987,7 @@ static void light_ctl_default_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_ctl_default_set_unack(struct bt_mesh_model *model,
+static int light_ctl_default_set_unack(const struct bt_mesh_model *model,
 					struct bt_mesh_msg_ctx *ctx,
 					struct net_buf_simple *buf)
 {
@@ -2018,7 +2018,7 @@ static int light_ctl_default_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_default_set(struct bt_mesh_model *model,
+static int light_ctl_default_set(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -2052,7 +2052,7 @@ static int light_ctl_default_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static void light_ctl_temp_range_publish(struct bt_mesh_model *model)
+static void light_ctl_temp_range_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -2072,7 +2072,7 @@ static void light_ctl_temp_range_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_ctl_temp_range_set_unack(struct bt_mesh_model *model,
+static int light_ctl_temp_range_set_unack(const struct bt_mesh_model *model,
 					  struct bt_mesh_msg_ctx *ctx,
 					  struct net_buf_simple *buf)
 {
@@ -2108,7 +2108,7 @@ static int light_ctl_temp_range_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_temp_range_set(struct bt_mesh_model *model,
+static int light_ctl_temp_range_set(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -2148,7 +2148,7 @@ static int light_ctl_temp_range_set(struct bt_mesh_model *model,
 }
 
 /* Light CTL Client message handlers */
-static int light_ctl_status(struct bt_mesh_model *model,
+static int light_ctl_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -2168,7 +2168,7 @@ static int light_ctl_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_temp_range_status(struct bt_mesh_model *model,
+static int light_ctl_temp_range_status(const struct bt_mesh_model *model,
 				       struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
@@ -2180,7 +2180,7 @@ static int light_ctl_temp_range_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_temp_status(struct bt_mesh_model *model,
+static int light_ctl_temp_status(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -2201,7 +2201,7 @@ static int light_ctl_temp_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_default_status(struct bt_mesh_model *model,
+static int light_ctl_default_status(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -2214,7 +2214,7 @@ static int light_ctl_default_status(struct bt_mesh_model *model,
 }
 
 /* Light CTL Temp. Server message handlers */
-static int light_ctl_temp_get(struct bt_mesh_model *model,
+static int light_ctl_temp_get(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2244,7 +2244,7 @@ send:
 	return 0;
 }
 
-void light_ctl_temp_publish(struct bt_mesh_model *model)
+void light_ctl_temp_publish(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -2270,7 +2270,7 @@ void light_ctl_temp_publish(struct bt_mesh_model *model)
 	}
 }
 
-static int light_ctl_temp_set_unack(struct bt_mesh_model *model,
+static int light_ctl_temp_set_unack(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -2345,7 +2345,7 @@ static int light_ctl_temp_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int light_ctl_temp_set(struct bt_mesh_model *model,
+static int light_ctl_temp_set(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2424,7 +2424,7 @@ static int light_ctl_temp_set(struct bt_mesh_model *model,
 }
 
 /* Generic Level (TEMPERATURE) Server message handlers */
-static int gen_level_get_temp(struct bt_mesh_model *model,
+static int gen_level_get_temp(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2451,7 +2451,7 @@ send:
 	return 0;
 }
 
-void gen_level_publish_temp(struct bt_mesh_model *model)
+void gen_level_publish_temp(const struct bt_mesh_model *model)
 {
 	int err;
 	struct net_buf_simple *msg = model->pub->msg;
@@ -2475,7 +2475,7 @@ void gen_level_publish_temp(struct bt_mesh_model *model)
 	}
 }
 
-static int gen_level_set_unack_temp(struct bt_mesh_model *model,
+static int gen_level_set_unack_temp(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -2541,7 +2541,7 @@ static int gen_level_set_unack_temp(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_level_set_temp(struct bt_mesh_model *model,
+static int gen_level_set_temp(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2610,7 +2610,7 @@ static int gen_level_set_temp(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_delta_set_unack_temp(struct bt_mesh_model *model,
+static int gen_delta_set_unack_temp(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -2692,7 +2692,7 @@ static int gen_delta_set_unack_temp(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_delta_set_temp(struct bt_mesh_model *model,
+static int gen_delta_set_temp(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2777,7 +2777,7 @@ static int gen_delta_set_temp(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_move_set_unack_temp(struct bt_mesh_model *model,
+static int gen_move_set_unack_temp(const struct bt_mesh_model *model,
 				   struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
@@ -2852,7 +2852,7 @@ static int gen_move_set_unack_temp(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_move_set_temp(struct bt_mesh_model *model,
+static int gen_move_set_temp(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -2931,7 +2931,7 @@ static int gen_move_set_temp(struct bt_mesh_model *model,
 }
 
 /* Generic Level (TEMPERATURE) Client message handlers */
-static int gen_level_status_temp(struct bt_mesh_model *model,
+static int gen_level_status_temp(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -3112,7 +3112,7 @@ static const struct bt_mesh_model_op gen_level_cli_op_temp[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-struct bt_mesh_model root_models[] = {
+const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
 
@@ -3172,12 +3172,12 @@ struct bt_mesh_model root_models[] = {
 		      NULL),
 };
 
-struct bt_mesh_model vnd_models[] = {
+const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND(CID_ZEPHYR, 0x4321, vnd_ops,
 			  &vnd_pub, &vnd_user_data),
 };
 
-struct bt_mesh_model s0_models[] = {
+const struct bt_mesh_model s0_models[] = {
 	BT_MESH_MODEL(BT_MESH_MODEL_ID_GEN_LEVEL_SRV,
 		      gen_level_srv_op_temp, &gen_level_srv_pub_s0,
 		      NULL),
diff --git a/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.h b/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.h
index 2bc4c836926..108075379b0 100644
--- a/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.h
+++ b/samples/boards/nrf/mesh/onoff_level_lighting_vnd_app/src/mesh/device_composition.h
@@ -93,18 +93,18 @@ struct light_ctl_state {
 extern struct vendor_state vnd_user_data;
 extern struct light_ctl_state *const ctl;
 
-extern struct bt_mesh_model root_models[];
-extern struct bt_mesh_model vnd_models[];
-extern struct bt_mesh_model s0_models[];
+extern const struct bt_mesh_model root_models[];
+extern const struct bt_mesh_model vnd_models[];
+extern const struct bt_mesh_model s0_models[];
 
 extern const struct bt_mesh_comp comp;
 
-void gen_onoff_publish(struct bt_mesh_model *model);
-void gen_level_publish(struct bt_mesh_model *model);
-void light_lightness_publish(struct bt_mesh_model *model);
-void light_lightness_linear_publish(struct bt_mesh_model *model);
-void light_ctl_publish(struct bt_mesh_model *model);
-void light_ctl_temp_publish(struct bt_mesh_model *model);
-void gen_level_publish_temp(struct bt_mesh_model *model);
+void gen_onoff_publish(const struct bt_mesh_model *model);
+void gen_level_publish(const struct bt_mesh_model *model);
+void light_lightness_publish(const struct bt_mesh_model *model);
+void light_lightness_linear_publish(const struct bt_mesh_model *model);
+void light_ctl_publish(const struct bt_mesh_model *model);
+void light_ctl_temp_publish(const struct bt_mesh_model *model);
+void gen_level_publish_temp(const struct bt_mesh_model *model);
 
 #endif
diff --git a/samples/boards/reel_board/mesh_badge/src/mesh.c b/samples/boards/reel_board/mesh_badge/src/mesh.c
index d2916d141e6..ae219387cf5 100644
--- a/samples/boards/reel_board/mesh_badge/src/mesh.c
+++ b/samples/boards/reel_board/mesh_badge/src/mesh.c
@@ -159,12 +159,12 @@ static struct bt_mesh_cfg_cli cfg_cli = {
 	.cb = &cfg_cli_cb,
 };
 
-static void attention_on(struct bt_mesh_model *model)
+static void attention_on(const struct bt_mesh_model *model)
 {
 	board_show_text("Attention!", false, K_SECONDS(2));
 }
 
-static void attention_off(struct bt_mesh_model *model)
+static void attention_off(const struct bt_mesh_model *model)
 {
 	board_refresh_display();
 }
@@ -179,12 +179,12 @@ static struct bt_mesh_health_srv health_srv = {
 };
 
 /* Generic OnOff Server message handlers */
-static int gen_onoff_get(struct bt_mesh_model *model,
+static int gen_onoff_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(msg, 2 + 1 + 4);
-	struct led_onoff_state *state = model->user_data;
+	struct led_onoff_state *state = *(model->user_data);
 
 	printk("addr 0x%04x onoff 0x%02x\n",
 	       bt_mesh_model_elem(model)->addr, state->current);
@@ -198,12 +198,12 @@ static int gen_onoff_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set_unack(struct bt_mesh_model *model,
+static int gen_onoff_set_unack(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
 	struct net_buf_simple *msg = model->pub->msg;
-	struct led_onoff_state *state = model->user_data;
+	struct led_onoff_state *state = *(model->user_data);
 	int err;
 	uint8_t tid, onoff;
 	int64_t now;
@@ -263,7 +263,7 @@ static int gen_onoff_set_unack(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gen_onoff_set(struct bt_mesh_model *model,
+static int gen_onoff_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -273,7 +273,7 @@ static int gen_onoff_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int sensor_desc_get(struct bt_mesh_model *model,
+static int sensor_desc_get(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
@@ -333,7 +333,7 @@ static void sensor_create_status(uint16_t id, struct net_buf_simple *msg)
 	}
 }
 
-static int sensor_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int sensor_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(msg, 1 + MAX_SENS_STATUS_LEN + 4);
@@ -349,7 +349,7 @@ static int sensor_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int sensor_col_get(struct bt_mesh_model *model,
+static int sensor_col_get(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -357,7 +357,7 @@ static int sensor_col_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int sensor_series_get(struct bt_mesh_model *model,
+static int sensor_series_get(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -385,7 +385,7 @@ static const struct bt_mesh_model_op sensor_srv_op[] = {
 	{ BT_MESH_MODEL_OP_SENS_SERIES_GET, BT_MESH_LEN_EXACT(2), sensor_series_get },
 };
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
@@ -396,7 +396,7 @@ static struct bt_mesh_model root_models[] = {
 		      sensor_srv_op, NULL, NULL),
 };
 
-static int vnd_hello(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int vnd_hello(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		     struct net_buf_simple *buf)
 {
 	char str[32];
@@ -423,7 +423,7 @@ static int vnd_hello(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int vnd_baduser(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int vnd_baduser(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	char str[32];
@@ -448,7 +448,7 @@ static int vnd_baduser(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int vnd_heartbeat(struct bt_mesh_model *model,
+static int vnd_heartbeat(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -477,7 +477,7 @@ static const struct bt_mesh_model_op vnd_ops[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int pub_update(struct bt_mesh_model *mod)
+static int pub_update(const struct bt_mesh_model *mod)
 {
 	struct net_buf_simple *msg = mod->pub->msg;
 
@@ -491,7 +491,7 @@ static int pub_update(struct bt_mesh_model *mod)
 
 BT_MESH_MODEL_PUB_DEFINE(vnd_pub, pub_update, 3 + 1);
 
-static struct bt_mesh_model vnd_models[] = {
+static const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND(BT_COMP_ID_LF, MOD_LF, vnd_ops, &vnd_pub, NULL),
 };
 
diff --git a/subsys/bluetooth/host/testing.c b/subsys/bluetooth/host/testing.c
index 3c118c51e0f..5e2f507bb58 100644
--- a/subsys/bluetooth/host/testing.c
+++ b/subsys/bluetooth/host/testing.c
@@ -56,7 +56,7 @@ void bt_test_mesh_model_recv(uint16_t src, uint16_t dst, const void *payload,
 	}
 }
 
-void bt_test_mesh_model_bound(uint16_t addr, struct bt_mesh_model *model,
+void bt_test_mesh_model_bound(uint16_t addr, const struct bt_mesh_model *model,
 			      uint16_t key_idx)
 {
 	struct bt_test_cb *cb;
@@ -68,7 +68,7 @@ void bt_test_mesh_model_bound(uint16_t addr, struct bt_mesh_model *model,
 	}
 }
 
-void bt_test_mesh_model_unbound(uint16_t addr, struct bt_mesh_model *model,
+void bt_test_mesh_model_unbound(uint16_t addr, const struct bt_mesh_model *model,
 				uint16_t key_idx)
 {
 	struct bt_test_cb *cb;
diff --git a/subsys/bluetooth/host/testing.h b/subsys/bluetooth/host/testing.h
index 0e6cfbaf785..8ed1fa61e46 100644
--- a/subsys/bluetooth/host/testing.h
+++ b/subsys/bluetooth/host/testing.h
@@ -14,9 +14,9 @@ void bt_test_mesh_net_recv(uint8_t ttl, uint8_t ctl, uint16_t src, uint16_t dst,
 			   const void *payload, size_t payload_len);
 void bt_test_mesh_model_recv(uint16_t src, uint16_t dst, const void *payload,
 			     size_t payload_len);
-void bt_test_mesh_model_bound(uint16_t addr, struct bt_mesh_model *model,
+void bt_test_mesh_model_bound(uint16_t addr, const struct bt_mesh_model *model,
 			      uint16_t key_idx);
-void bt_test_mesh_model_unbound(uint16_t addr, struct bt_mesh_model *model,
+void bt_test_mesh_model_unbound(uint16_t addr, const struct bt_mesh_model *model,
 				uint16_t key_idx);
 void bt_test_mesh_prov_invalid_bearer(uint8_t opcode);
 void bt_test_mesh_trans_incomp_timer_exp(void);
diff --git a/subsys/bluetooth/mesh/access.c b/subsys/bluetooth/mesh/access.c
index 4f1941a9e66..2911a42c7af 100644
--- a/subsys/bluetooth/mesh/access.c
+++ b/subsys/bluetooth/mesh/access.c
@@ -92,12 +92,12 @@ static struct mod_relation mod_rel_list[MOD_REL_LIST_SIZE];
 		 (idx)++)
 
 #define IS_MOD_BASE(mod, idx, offset) \
-	(mod_rel_list[(idx)].elem_base == (mod)->elem_idx && \
-	 mod_rel_list[(idx)].idx_base == (mod)->mod_idx + (offset))
+	(mod_rel_list[(idx)].elem_base == *((mod)->elem_idx) && \
+	 mod_rel_list[(idx)].idx_base == *((mod)->mod_idx) + (offset))
 
 #define IS_MOD_EXTENSION(mod, idx, offset) \
-	 (mod_rel_list[(idx)].elem_ext == (mod)->elem_idx && \
-	  mod_rel_list[(idx)].idx_ext == (mod)->mod_idx + (offset))
+	 (mod_rel_list[(idx)].elem_ext == *((mod)->elem_idx) && \
+	  mod_rel_list[(idx)].idx_ext == *((mod)->mod_idx) + (offset))
 
 #define RELATION_TYPE_EXT 0xFF
 
@@ -114,7 +114,7 @@ static const struct {
 #endif
 };
 
-void bt_mesh_model_foreach(void (*func)(struct bt_mesh_model *mod,
+void bt_mesh_model_foreach(void (*func)(const struct bt_mesh_model *mod,
 					struct bt_mesh_elem *elem,
 					bool vnd, bool primary,
 					void *user_data),
@@ -126,13 +126,13 @@ void bt_mesh_model_foreach(void (*func)(struct bt_mesh_model *mod,
 		struct bt_mesh_elem *elem = &dev_comp->elem[i];
 
 		for (j = 0; j < elem->model_count; j++) {
-			struct bt_mesh_model *model = &elem->models[j];
+			const struct bt_mesh_model *model = &elem->models[j];
 
 			func(model, elem, false, i == 0, user_data);
 		}
 
 		for (j = 0; j < elem->vnd_model_count; j++) {
-			struct bt_mesh_model *model = &elem->vnd_models[j];
+			const struct bt_mesh_model *model = &elem->vnd_models[j];
 
 			func(model, elem, true, i == 0, user_data);
 		}
@@ -181,7 +181,7 @@ static void data_buf_add_mem_offset(struct net_buf_simple *buf, uint8_t *data, s
 	*offset = 0;
 }
 
-static void comp_add_model(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void comp_add_model(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 			   bool vnd, void *user_data)
 {
 	struct comp_foreach_model_arg *arg = user_data;
@@ -196,7 +196,7 @@ static void comp_add_model(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 
 #if defined(CONFIG_BT_MESH_LARGE_COMP_DATA_SRV)
 
-static size_t metadata_model_size(struct bt_mesh_model *mod,
+static size_t metadata_model_size(const struct bt_mesh_model *mod,
 				  struct bt_mesh_elem *elem, bool vnd)
 {
 	const struct bt_mesh_models_metadata_entry *entry;
@@ -237,13 +237,13 @@ size_t bt_mesh_metadata_page_0_size(void)
 			sizeof(elem->vnd_model_count);
 
 		for (j = 0; j < elem->model_count; j++) {
-			struct bt_mesh_model *model = &elem->models[j];
+			const struct bt_mesh_model *model = &elem->models[j];
 
 			size += metadata_model_size(model, elem, false);
 		}
 
 		for (j = 0; j < elem->vnd_model_count; j++) {
-			struct bt_mesh_model *model = &elem->vnd_models[j];
+			const struct bt_mesh_model *model = &elem->vnd_models[j];
 
 			size += metadata_model_size(model, elem, true);
 		}
@@ -252,7 +252,7 @@ size_t bt_mesh_metadata_page_0_size(void)
 	return size;
 }
 
-static int metadata_add_model(struct bt_mesh_model *mod,
+static int metadata_add_model(const struct bt_mesh_model *mod,
 			      struct bt_mesh_elem *elem, bool vnd,
 			      void *user_data)
 {
@@ -322,7 +322,7 @@ int bt_mesh_metadata_get_page_0(struct net_buf_simple *buf, size_t offset)
 		vnd_count_ptr = data_buf_add_u8_offset(buf, 0, &offset);
 
 		for (j = 0; j < elem->model_count; j++) {
-			struct bt_mesh_model *model = &elem->models[j];
+			const struct bt_mesh_model *model = &elem->models[j];
 
 			if (!model->metadata) {
 				continue;
@@ -339,7 +339,7 @@ int bt_mesh_metadata_get_page_0(struct net_buf_simple *buf, size_t offset)
 		}
 
 		for (j = 0; j < elem->vnd_model_count; j++) {
-			struct bt_mesh_model *model = &elem->vnd_models[j];
+			const struct bt_mesh_model *model = &elem->vnd_models[j];
 
 			if (!model->metadata) {
 				continue;
@@ -396,13 +396,13 @@ static int comp_add_elem(struct net_buf_simple *buf, struct bt_mesh_elem *elem,
 	data_buf_add_u8_offset(buf, elem->vnd_model_count, offset);
 
 	for (i = 0; i < elem->model_count; i++) {
-		struct bt_mesh_model *model = &elem->models[i];
+		const struct bt_mesh_model *model = &elem->models[i];
 
 		comp_add_model(model, elem, false, &arg);
 	}
 
 	for (i = 0; i < elem->vnd_model_count; i++) {
-		struct bt_mesh_model *model = &elem->vnd_models[i];
+		const struct bt_mesh_model *model = &elem->vnd_models[i];
 
 		comp_add_model(model, elem, true, &arg);
 	}
@@ -452,7 +452,8 @@ int bt_mesh_comp_data_get_page_0(struct net_buf_simple *buf, size_t offset)
 	return 0;
 }
 
-static uint8_t count_mod_ext(struct bt_mesh_model *mod, uint8_t *max_offset, uint8_t sig_offset)
+static uint8_t count_mod_ext(const struct bt_mesh_model *mod,
+			     uint8_t *max_offset, uint8_t sig_offset)
 {
 	int i;
 	uint8_t extensions = 0;
@@ -476,7 +477,7 @@ static uint8_t count_mod_ext(struct bt_mesh_model *mod, uint8_t *max_offset, uin
 	return extensions;
 }
 
-static bool is_cor_present(struct bt_mesh_model *mod, uint8_t *cor_id, uint8_t sig_offset)
+static bool is_cor_present(const struct bt_mesh_model *mod, uint8_t *cor_id, uint8_t sig_offset)
 {
 	int i;
 
@@ -494,8 +495,9 @@ static bool is_cor_present(struct bt_mesh_model *mod, uint8_t *cor_id, uint8_t s
 	return false;
 }
 
-static void prep_model_item_header(struct bt_mesh_model *mod, uint8_t *cor_id, uint8_t *mod_cnt,
-				   struct net_buf_simple *buf, size_t *offset, uint8_t sig_offset)
+static void prep_model_item_header(const struct bt_mesh_model *mod, uint8_t *cor_id,
+				   uint8_t *mod_cnt, struct net_buf_simple *buf,
+				   size_t *offset, uint8_t sig_offset)
 {
 	uint8_t ext_mod_cnt;
 	bool cor_present;
@@ -522,7 +524,7 @@ static void prep_model_item_header(struct bt_mesh_model *mod, uint8_t *cor_id, u
 	memset(mod_cnt, ext_mod_cnt, sizeof(uint8_t));
 }
 
-static void add_items_to_page(struct net_buf_simple *buf, struct bt_mesh_model *mod,
+static void add_items_to_page(struct net_buf_simple *buf, const struct bt_mesh_model *mod,
 			      uint8_t ext_mod_cnt, size_t *offset, uint8_t sig_offset)
 {
 	int i, elem_offset;
@@ -531,7 +533,7 @@ static void add_items_to_page(struct net_buf_simple *buf, struct bt_mesh_model *
 	MOD_REL_LIST_FOR_EACH(i) {
 		if (IS_MOD_EXTENSION(mod, i, sig_offset) &&
 		    mod_rel_list[i].type == RELATION_TYPE_EXT) {
-			elem_offset = mod->elem_idx - mod_rel_list[i].elem_base;
+			elem_offset = *(mod->elem_idx) - mod_rel_list[i].elem_base;
 			mod_idx = mod_rel_list[i].idx_base;
 			if (ext_mod_cnt < 32 &&
 				elem_offset < 4 &&
@@ -555,7 +557,7 @@ static void add_items_to_page(struct net_buf_simple *buf, struct bt_mesh_model *
 	}
 }
 
-static size_t mod_items_size(struct bt_mesh_model *mod, uint8_t sig_offset)
+static size_t mod_items_size(const struct bt_mesh_model *mod, uint8_t sig_offset)
 {
 	int i, offset;
 	size_t temp_size = 0;
@@ -567,7 +569,7 @@ static size_t mod_items_size(struct bt_mesh_model *mod, uint8_t sig_offset)
 
 	MOD_REL_LIST_FOR_EACH(i) {
 		if (IS_MOD_EXTENSION(mod, i, sig_offset)) {
-			offset = mod->elem_idx - mod_rel_list[i].elem_base;
+			offset = *(mod->elem_idx) - mod_rel_list[i].elem_base;
 			temp_size += (ext_mod_cnt < 32 && offset < 4 && offset > -5) ? 1 : 2;
 		}
 	}
@@ -701,7 +703,7 @@ static int bt_mesh_comp_data_get_page_2(struct net_buf_simple *buf, size_t offse
 	return 0;
 }
 
-int32_t bt_mesh_model_pub_period_get(struct bt_mesh_model *mod)
+int32_t bt_mesh_model_pub_period_get(const struct bt_mesh_model *mod)
 {
 	int32_t period;
 
@@ -741,7 +743,7 @@ int32_t bt_mesh_model_pub_period_get(struct bt_mesh_model *mod)
 	}
 }
 
-static int32_t next_period(struct bt_mesh_model *mod)
+static int32_t next_period(const struct bt_mesh_model *mod)
 {
 	struct bt_mesh_model_pub *pub = mod->pub;
 	uint32_t period = 0;
@@ -782,7 +784,7 @@ static int32_t next_period(struct bt_mesh_model *mod)
 
 static void publish_sent(int err, void *user_data)
 {
-	struct bt_mesh_model *mod = user_data;
+	const struct bt_mesh_model *mod = user_data;
 	int32_t delay;
 
 	LOG_DBG("err %d, time %u", err, k_uptime_get_32());
@@ -812,7 +814,7 @@ static const struct bt_mesh_send_cb pub_sent_cb = {
 	.end = publish_sent,
 };
 
-static int publish_transmit(struct bt_mesh_model *mod)
+static int publish_transmit(const struct bt_mesh_model *mod)
 {
 	NET_BUF_SIMPLE_DEFINE(sdu, BT_MESH_TX_SDU_MAX);
 	struct bt_mesh_model_pub *pub = mod->pub;
@@ -825,7 +827,7 @@ static int publish_transmit(struct bt_mesh_model *mod)
 
 	net_buf_simple_add_mem(&sdu, pub->msg->data, pub->msg->len);
 
-	return bt_mesh_trans_send(&tx, &sdu, &pub_sent_cb, mod);
+	return bt_mesh_trans_send(&tx, &sdu, &pub_sent_cb, (void *)mod);
 }
 
 static int pub_period_start(struct bt_mesh_model_pub *pub)
@@ -846,7 +848,7 @@ static int pub_period_start(struct bt_mesh_model_pub *pub)
 		/* Skip this publish attempt. */
 		LOG_DBG("Update failed, skipping publish (err: %d)", err);
 		pub->count = 0;
-		publish_sent(err, pub->mod);
+		publish_sent(err, (void *)pub->mod);
 		return err;
 	}
 
@@ -878,7 +880,7 @@ static void mod_publish(struct k_work *work)
 		    bt_mesh_model_pub_is_retransmission(pub->mod)) {
 			err = pub->update(pub->mod);
 			if (err) {
-				publish_sent(err, pub->mod);
+				publish_sent(err, (void *)pub->mod);
 				return;
 			}
 		}
@@ -893,16 +895,16 @@ static void mod_publish(struct k_work *work)
 	err = publish_transmit(pub->mod);
 	if (err) {
 		LOG_ERR("Failed to publish (err %d)", err);
-		publish_sent(err, pub->mod);
+		publish_sent(err, (void *)pub->mod);
 	}
 }
 
-struct bt_mesh_elem *bt_mesh_model_elem(struct bt_mesh_model *mod)
+struct bt_mesh_elem *bt_mesh_model_elem(const struct bt_mesh_model *mod)
 {
-	return &dev_comp->elem[mod->elem_idx];
+	return &dev_comp->elem[*(mod->elem_idx)];
 }
 
-struct bt_mesh_model *bt_mesh_model_get(bool vnd, uint8_t elem_idx, uint8_t mod_idx)
+const struct bt_mesh_model *bt_mesh_model_get(bool vnd, uint8_t elem_idx, uint8_t mod_idx)
 {
 	struct bt_mesh_elem *elem;
 
@@ -931,7 +933,7 @@ struct bt_mesh_model *bt_mesh_model_get(bool vnd, uint8_t elem_idx, uint8_t mod_
 }
 
 #if defined(CONFIG_BT_MESH_MODEL_VND_MSG_CID_FORCE)
-static int bt_mesh_vnd_mod_msg_cid_check(struct bt_mesh_model *mod)
+static int bt_mesh_vnd_mod_msg_cid_check(const struct bt_mesh_model *mod)
 {
 	uint16_t cid;
 	const struct bt_mesh_model_op *op;
@@ -954,7 +956,7 @@ static int bt_mesh_vnd_mod_msg_cid_check(struct bt_mesh_model *mod)
 }
 #endif
 
-static void mod_init(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void mod_init(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 		     bool vnd, bool primary, void *user_data)
 {
 	int i;
@@ -973,9 +975,9 @@ static void mod_init(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 		mod->keys[i] = BT_MESH_KEY_UNUSED;
 	}
 
-	mod->elem_idx = elem - dev_comp->elem;
+	*(mod->elem_idx) = elem - dev_comp->elem;
 	if (vnd) {
-		mod->mod_idx = mod - elem->vnd_models;
+		*(mod->mod_idx) = mod - elem->vnd_models;
 
 		if (IS_ENABLED(CONFIG_BT_MESH_MODEL_VND_MSG_CID_FORCE)) {
 			*err = bt_mesh_vnd_mod_msg_cid_check(mod);
@@ -985,7 +987,7 @@ static void mod_init(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 		}
 
 	} else {
-		mod->mod_idx = mod - elem->models;
+		*(mod->mod_idx) = mod - elem->models;
 	}
 
 	if (mod->cb && mod->cb->init) {
@@ -1082,7 +1084,7 @@ uint16_t bt_mesh_primary_addr(void)
 	return dev_primary_addr;
 }
 
-static uint16_t *model_group_get(struct bt_mesh_model *mod, uint16_t addr)
+static uint16_t *model_group_get(const struct bt_mesh_model *mod, uint16_t addr)
 {
 	int i;
 
@@ -1097,15 +1099,15 @@ static uint16_t *model_group_get(struct bt_mesh_model *mod, uint16_t addr)
 
 struct find_group_visitor_ctx {
 	uint16_t *entry;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	uint16_t addr;
 };
 
-static enum bt_mesh_walk find_group_mod_visitor(struct bt_mesh_model *mod, void *user_data)
+static enum bt_mesh_walk find_group_mod_visitor(const struct bt_mesh_model *mod, void *user_data)
 {
 	struct find_group_visitor_ctx *ctx = user_data;
 
-	if (mod->elem_idx != ctx->mod->elem_idx) {
+	if (*(mod->elem_idx) != *(ctx->mod->elem_idx)) {
 		return BT_MESH_WALK_CONTINUE;
 	}
 
@@ -1118,7 +1120,7 @@ static enum bt_mesh_walk find_group_mod_visitor(struct bt_mesh_model *mod, void
 	return BT_MESH_WALK_CONTINUE;
 }
 
-uint16_t *bt_mesh_model_find_group(struct bt_mesh_model **mod, uint16_t addr)
+uint16_t *bt_mesh_model_find_group(const struct bt_mesh_model **mod, uint16_t addr)
 {
 	struct find_group_visitor_ctx ctx = {
 		.mod = *mod,
@@ -1133,7 +1135,7 @@ uint16_t *bt_mesh_model_find_group(struct bt_mesh_model **mod, uint16_t addr)
 }
 
 #if CONFIG_BT_MESH_LABEL_COUNT > 0
-static const uint8_t **model_uuid_get(struct bt_mesh_model *mod, const uint8_t *uuid)
+static const uint8_t **model_uuid_get(const struct bt_mesh_model *mod, const uint8_t *uuid)
 {
 	int i;
 
@@ -1155,15 +1157,15 @@ static const uint8_t **model_uuid_get(struct bt_mesh_model *mod, const uint8_t *
 
 struct find_uuid_visitor_ctx {
 	const uint8_t **entry;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	const uint8_t *uuid;
 };
 
-static enum bt_mesh_walk find_uuid_mod_visitor(struct bt_mesh_model *mod, void *user_data)
+static enum bt_mesh_walk find_uuid_mod_visitor(const struct bt_mesh_model *mod, void *user_data)
 {
 	struct find_uuid_visitor_ctx *ctx = user_data;
 
-	if (mod->elem_idx != ctx->mod->elem_idx) {
+	if (*(mod->elem_idx) != *(ctx->mod->elem_idx)) {
 		return BT_MESH_WALK_CONTINUE;
 	}
 
@@ -1177,7 +1179,7 @@ static enum bt_mesh_walk find_uuid_mod_visitor(struct bt_mesh_model *mod, void *
 }
 #endif /* CONFIG_BT_MESH_LABEL_COUNT > 0 */
 
-const uint8_t **bt_mesh_model_find_uuid(struct bt_mesh_model **mod, const uint8_t *uuid)
+const uint8_t **bt_mesh_model_find_uuid(const struct bt_mesh_model **mod, const uint8_t *uuid)
 {
 #if CONFIG_BT_MESH_LABEL_COUNT > 0
 	struct find_uuid_visitor_ctx ctx = {
@@ -1195,10 +1197,10 @@ const uint8_t **bt_mesh_model_find_uuid(struct bt_mesh_model **mod, const uint8_
 #endif
 }
 
-static struct bt_mesh_model *bt_mesh_elem_find_group(struct bt_mesh_elem *elem,
+static const struct bt_mesh_model *bt_mesh_elem_find_group(struct bt_mesh_elem *elem,
 						     uint16_t group_addr)
 {
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 	uint16_t *match;
 	int i;
 
@@ -1295,7 +1297,7 @@ uint8_t bt_mesh_elem_count(void)
 	return dev_comp->elem_count;
 }
 
-bool bt_mesh_model_has_key(struct bt_mesh_model *mod, uint16_t key)
+bool bt_mesh_model_has_key(const struct bt_mesh_model *mod, uint16_t key)
 {
 	int i;
 
@@ -1310,14 +1312,14 @@ bool bt_mesh_model_has_key(struct bt_mesh_model *mod, uint16_t key)
 	return false;
 }
 
-static bool model_has_dst(struct bt_mesh_model *mod, uint16_t dst, const uint8_t *uuid)
+static bool model_has_dst(const struct bt_mesh_model *mod, uint16_t dst, const uint8_t *uuid)
 {
 	if (BT_MESH_ADDR_IS_UNICAST(dst)) {
-		return (dev_comp->elem[mod->elem_idx].addr == dst);
+		return (dev_comp->elem[*(mod->elem_idx)].addr == dst);
 	} else if (BT_MESH_ADDR_IS_VIRTUAL(dst)) {
 		return !!bt_mesh_model_find_uuid(&mod, uuid);
 	} else if (BT_MESH_ADDR_IS_GROUP(dst) ||
-		  (BT_MESH_ADDR_IS_FIXED_GROUP(dst) &&  mod->elem_idx != 0)) {
+		  (BT_MESH_ADDR_IS_FIXED_GROUP(dst) &&  *(mod->elem_idx) != 0)) {
 		return !!bt_mesh_model_find_group(&mod, dst);
 	}
 
@@ -1325,17 +1327,17 @@ static bool model_has_dst(struct bt_mesh_model *mod, uint16_t dst, const uint8_t
 	 * the lower layers have already confirmed that we are subscribing to
 	 * it. All models on the primary element should receive the message.
 	 */
-	return mod->elem_idx == 0;
+	return *(mod->elem_idx) == 0;
 }
 
 static const struct bt_mesh_model_op *find_op(struct bt_mesh_elem *elem,
-					      uint32_t opcode, struct bt_mesh_model **model)
+					      uint32_t opcode, const struct bt_mesh_model **model)
 {
 	uint8_t i;
 	uint8_t count;
 	/* This value shall not be used in shipping end products. */
 	uint32_t cid = UINT32_MAX;
-	struct bt_mesh_model *models;
+	const struct bt_mesh_model *models;
 
 	/* SIG models cannot contain 3-byte (vendor) OpCodes, and
 	 * vendor models cannot contain SIG (1- or 2-byte) OpCodes, so
@@ -1416,7 +1418,7 @@ static int element_model_recv(struct bt_mesh_msg_ctx *ctx, struct net_buf_simple
 			      struct bt_mesh_elem *elem, uint32_t opcode)
 {
 	const struct bt_mesh_model_op *op;
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 	struct net_buf_simple_state state;
 	int err;
 
@@ -1502,7 +1504,7 @@ int bt_mesh_model_recv(struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf)
 	return err;
 }
 
-int bt_mesh_model_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+int bt_mesh_model_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *msg,
 		       const struct bt_mesh_send_cb *cb, void *cb_data)
 {
@@ -1520,7 +1522,7 @@ int bt_mesh_model_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return bt_mesh_access_send(ctx, msg, bt_mesh_model_elem(model)->addr, cb, cb_data);
 }
 
-int bt_mesh_model_publish(struct bt_mesh_model *model)
+int bt_mesh_model_publish(const struct bt_mesh_model *model)
 {
 	struct bt_mesh_model_pub *pub = model->pub;
 
@@ -1560,7 +1562,7 @@ int bt_mesh_model_publish(struct bt_mesh_model *model)
 	return 0;
 }
 
-struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
+const struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
 					     uint16_t company, uint16_t id)
 {
 	uint8_t i;
@@ -1575,7 +1577,7 @@ struct bt_mesh_model *bt_mesh_model_find_vnd(const struct bt_mesh_elem *elem,
 	return NULL;
 }
 
-struct bt_mesh_model *bt_mesh_model_find(const struct bt_mesh_elem *elem,
+const struct bt_mesh_model *bt_mesh_model_find(const struct bt_mesh_elem *elem,
 					 uint16_t id)
 {
 	uint8_t i;
@@ -1594,8 +1596,8 @@ const struct bt_mesh_comp *bt_mesh_comp_get(void)
 	return dev_comp;
 }
 
-void bt_mesh_model_extensions_walk(struct bt_mesh_model *model,
-				   enum bt_mesh_walk (*cb)(struct bt_mesh_model *mod,
+void bt_mesh_model_extensions_walk(const struct bt_mesh_model *model,
+				   enum bt_mesh_walk (*cb)(const struct bt_mesh_model *mod,
 							   void *user_data),
 				   void *user_data)
 {
@@ -1603,14 +1605,14 @@ void bt_mesh_model_extensions_walk(struct bt_mesh_model *model,
 	(void)cb(model, user_data);
 	return;
 #else
-	struct bt_mesh_model *it;
+	const struct bt_mesh_model *it;
 
-	if (cb(model, user_data) == BT_MESH_WALK_STOP || !model->next) {
+	if (cb(model, user_data) == BT_MESH_WALK_STOP || !*(model->next)) {
 		return;
 	}
 
 	/* List is circular. Step through all models until we reach the start: */
-	for (it = model->next; it != model; it = it->next) {
+	for (it = *(model->next); it != model; it = *(it->next)) {
 		if (cb(it, user_data) == BT_MESH_WALK_STOP) {
 			return;
 		}
@@ -1622,7 +1624,7 @@ void bt_mesh_model_extensions_walk(struct bt_mesh_model *model,
 /* For vendor models, determine the offset within the model relation list
  * by counting the number of standard SIG models in the associated element.
  */
-static uint8_t get_sig_offset(struct bt_mesh_model *mod)
+static uint8_t get_sig_offset(const struct bt_mesh_model *mod)
 {
 	const struct bt_mesh_elem *elem = bt_mesh_model_elem(mod);
 	uint8_t i;
@@ -1635,16 +1637,16 @@ static uint8_t get_sig_offset(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static int mod_rel_register(struct bt_mesh_model *base,
-				 struct bt_mesh_model *ext,
+static int mod_rel_register(const struct bt_mesh_model *base,
+				 const struct bt_mesh_model *ext,
 				 uint8_t type)
 {
 	LOG_DBG("");
 	struct mod_relation extension = {
-		base->elem_idx,
-		base->mod_idx + get_sig_offset(base),
-		ext->elem_idx,
-		ext->mod_idx + get_sig_offset(ext),
+		*(base->elem_idx),
+		*(base->mod_idx) + get_sig_offset(base),
+		*(ext->elem_idx),
+		*(ext->mod_idx) + get_sig_offset(ext),
 		type,
 	};
 	int i;
@@ -1663,22 +1665,23 @@ static int mod_rel_register(struct bt_mesh_model *base,
 	return -ENOMEM;
 }
 
-int bt_mesh_model_extend(struct bt_mesh_model *extending_mod, struct bt_mesh_model *base_mod)
+int bt_mesh_model_extend(const struct bt_mesh_model *extending_mod,
+			 const struct bt_mesh_model *base_mod)
 {
-	struct bt_mesh_model *a = extending_mod;
-	struct bt_mesh_model *b = base_mod;
-	struct bt_mesh_model *a_next = a->next;
-	struct bt_mesh_model *b_next = b->next;
-	struct bt_mesh_model *it;
+	const struct bt_mesh_model *a = extending_mod;
+	const struct bt_mesh_model *b = base_mod;
+	const struct bt_mesh_model *a_next = *(a->next);
+	const struct bt_mesh_model *b_next = *(b->next);
+	const struct bt_mesh_model *it;
 
-	base_mod->flags |= BT_MESH_MOD_EXTENDED;
+	*(base_mod->flags) |= BT_MESH_MOD_EXTENDED;
 
 	if (a == b) {
 		return 0;
 	}
 
 	/* Check if a's list contains b */
-	for (it = a; (it != NULL) && (it->next != a); it = it->next) {
+	for (it = a; (it != NULL) && (*(it->next) != a); it = *(it->next)) {
 		if (it == b) {
 			goto register_extension;
 		}
@@ -1686,15 +1689,15 @@ int bt_mesh_model_extend(struct bt_mesh_model *extending_mod, struct bt_mesh_mod
 
 	/* Merge lists */
 	if (a_next) {
-		b->next = a_next;
+		*(b->next) = a_next;
 	} else {
-		b->next = a;
+		*(b->next) = a;
 	}
 
 	if (b_next) {
-		a->next = b_next;
+		*(a->next) = b_next;
 	} else {
-		a->next = b;
+		*(a->next) = b;
 	}
 
 register_extension:
@@ -1705,8 +1708,8 @@ register_extension:
 	return 0;
 }
 
-int bt_mesh_model_correspond(struct bt_mesh_model *corresponding_mod,
-			     struct bt_mesh_model *base_mod)
+int bt_mesh_model_correspond(const struct bt_mesh_model *corresponding_mod,
+			     const struct bt_mesh_model *base_mod)
 {
 	int i, err;
 	uint8_t cor_id = 0;
@@ -1740,12 +1743,12 @@ int bt_mesh_model_correspond(struct bt_mesh_model *corresponding_mod,
 }
 #endif /* CONFIG_BT_MESH_MODEL_EXTENSIONS */
 
-bool bt_mesh_model_is_extended(struct bt_mesh_model *model)
+bool bt_mesh_model_is_extended(const struct bt_mesh_model *model)
 {
-	return model->flags & BT_MESH_MOD_EXTENDED;
+	return *(model->flags) & BT_MESH_MOD_EXTENDED;
 }
 
-static int mod_set_bind(struct bt_mesh_model *mod, size_t len_rd,
+static int mod_set_bind(const struct bt_mesh_model *mod, size_t len_rd,
 			settings_read_cb read_cb, void *cb_arg)
 {
 	ssize_t len;
@@ -1773,7 +1776,7 @@ static int mod_set_bind(struct bt_mesh_model *mod, size_t len_rd,
 	return 0;
 }
 
-static int mod_set_sub(struct bt_mesh_model *mod, size_t len_rd,
+static int mod_set_sub(const struct bt_mesh_model *mod, size_t len_rd,
 		       settings_read_cb read_cb, void *cb_arg)
 {
 	size_t size = mod->groups_cnt * sizeof(mod->groups[0]);
@@ -1820,7 +1823,7 @@ static int mod_set_sub(struct bt_mesh_model *mod, size_t len_rd,
 	return 0;
 }
 
-static int mod_set_sub_va(struct bt_mesh_model *mod, size_t len_rd,
+static int mod_set_sub_va(const struct bt_mesh_model *mod, size_t len_rd,
 			  settings_read_cb read_cb, void *cb_arg)
 {
 #if CONFIG_BT_MESH_LABEL_COUNT > 0
@@ -1857,7 +1860,7 @@ static int mod_set_sub_va(struct bt_mesh_model *mod, size_t len_rd,
 	return 0;
 }
 
-static int mod_set_pub(struct bt_mesh_model *mod, size_t len_rd,
+static int mod_set_pub(const struct bt_mesh_model *mod, size_t len_rd,
 		       settings_read_cb read_cb, void *cb_arg)
 {
 	struct mod_pub_val pub;
@@ -1927,7 +1930,7 @@ pub_base_set:
 	return 0;
 }
 
-static int mod_data_set(struct bt_mesh_model *mod,
+static int mod_data_set(const struct bt_mesh_model *mod,
 			const char *name, size_t len_rd,
 			settings_read_cb read_cb, void *cb_arg)
 {
@@ -1946,7 +1949,7 @@ static int mod_data_set(struct bt_mesh_model *mod,
 static int mod_set(bool vnd, const char *name, size_t len_rd,
 		   settings_read_cb read_cb, void *cb_arg)
 {
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	uint8_t elem_idx, mod_idx;
 	uint16_t mod_key;
 	int len;
@@ -2035,10 +2038,10 @@ static int comp_set(const char *name, size_t len_rd, settings_read_cb read_cb,
 }
 BT_MESH_SETTINGS_DEFINE(comp, "cmp", comp_set);
 
-static void encode_mod_path(struct bt_mesh_model *mod, bool vnd,
+static void encode_mod_path(const struct bt_mesh_model *mod, bool vnd,
 			    const char *key, char *path, size_t path_len)
 {
-	uint16_t mod_key = (((uint16_t)mod->elem_idx << 8) | mod->mod_idx);
+	uint16_t mod_key = (((uint16_t)*(mod->elem_idx) << 8) | *(mod->mod_idx));
 
 	if (vnd) {
 		snprintk(path, path_len, "bt/mesh/v/%x/%s", mod_key, key);
@@ -2047,7 +2050,7 @@ static void encode_mod_path(struct bt_mesh_model *mod, bool vnd,
 	}
 }
 
-static void store_pending_mod_bind(struct bt_mesh_model *mod, bool vnd)
+static void store_pending_mod_bind(const struct bt_mesh_model *mod, bool vnd)
 {
 	uint16_t keys[CONFIG_BT_MESH_MODEL_KEY_COUNT];
 	char path[20];
@@ -2075,7 +2078,7 @@ static void store_pending_mod_bind(struct bt_mesh_model *mod, bool vnd)
 	}
 }
 
-static void store_pending_mod_sub(struct bt_mesh_model *mod, bool vnd)
+static void store_pending_mod_sub(const struct bt_mesh_model *mod, bool vnd)
 {
 	uint16_t groups[CONFIG_BT_MESH_MODEL_GROUP_COUNT];
 	char path[20];
@@ -2102,7 +2105,7 @@ static void store_pending_mod_sub(struct bt_mesh_model *mod, bool vnd)
 	}
 }
 
-static void store_pending_mod_sub_va(struct bt_mesh_model *mod, bool vnd)
+static void store_pending_mod_sub_va(const struct bt_mesh_model *mod, bool vnd)
 {
 #if CONFIG_BT_MESH_LABEL_COUNT > 0
 	uint16_t uuidxs[CONFIG_BT_MESH_LABEL_COUNT];
@@ -2134,7 +2137,7 @@ static void store_pending_mod_sub_va(struct bt_mesh_model *mod, bool vnd)
 #endif /* CONFIG_BT_MESH_LABEL_COUNT > 0 */
 }
 
-static void store_pending_mod_pub(struct bt_mesh_model *mod, bool vnd)
+static void store_pending_mod_pub(const struct bt_mesh_model *mod, bool vnd)
 {
 	struct mod_pub_val pub = {0};
 	char path[20];
@@ -2167,32 +2170,32 @@ static void store_pending_mod_pub(struct bt_mesh_model *mod, bool vnd)
 	}
 }
 
-static void store_pending_mod(struct bt_mesh_model *mod,
+static void store_pending_mod(const struct bt_mesh_model *mod,
 			      struct bt_mesh_elem *elem, bool vnd,
 			      bool primary, void *user_data)
 {
-	if (!mod->flags) {
+	if (!*(mod->flags)) {
 		return;
 	}
 
-	if (mod->flags & BT_MESH_MOD_BIND_PENDING) {
-		mod->flags &= ~BT_MESH_MOD_BIND_PENDING;
+	if (*(mod->flags) & BT_MESH_MOD_BIND_PENDING) {
+		*(mod->flags) &= ~BT_MESH_MOD_BIND_PENDING;
 		store_pending_mod_bind(mod, vnd);
 	}
 
-	if (mod->flags & BT_MESH_MOD_SUB_PENDING) {
-		mod->flags &= ~BT_MESH_MOD_SUB_PENDING;
+	if (*(mod->flags) & BT_MESH_MOD_SUB_PENDING) {
+		*(mod->flags) &= ~BT_MESH_MOD_SUB_PENDING;
 		store_pending_mod_sub(mod, vnd);
 		store_pending_mod_sub_va(mod, vnd);
 	}
 
-	if (mod->flags & BT_MESH_MOD_PUB_PENDING) {
-		mod->flags &= ~BT_MESH_MOD_PUB_PENDING;
+	if (*(mod->flags) & BT_MESH_MOD_PUB_PENDING) {
+		*(mod->flags) &= ~BT_MESH_MOD_PUB_PENDING;
 		store_pending_mod_pub(mod, vnd);
 	}
 
-	if (mod->flags & BT_MESH_MOD_DATA_PENDING) {
-		mod->flags &= ~BT_MESH_MOD_DATA_PENDING;
+	if (*(mod->flags) & BT_MESH_MOD_DATA_PENDING) {
+		*(mod->flags) &= ~BT_MESH_MOD_DATA_PENDING;
 		mod->cb->pending_store(mod);
 	}
 }
@@ -2202,21 +2205,21 @@ void bt_mesh_model_pending_store(void)
 	bt_mesh_model_foreach(store_pending_mod, NULL);
 }
 
-void bt_mesh_model_bind_store(struct bt_mesh_model *mod)
+void bt_mesh_model_bind_store(const struct bt_mesh_model *mod)
 {
-	mod->flags |= BT_MESH_MOD_BIND_PENDING;
+	*(mod->flags) |= BT_MESH_MOD_BIND_PENDING;
 	bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_MOD_PENDING);
 }
 
-void bt_mesh_model_sub_store(struct bt_mesh_model *mod)
+void bt_mesh_model_sub_store(const struct bt_mesh_model *mod)
 {
-	mod->flags |= BT_MESH_MOD_SUB_PENDING;
+	*(mod->flags) |= BT_MESH_MOD_SUB_PENDING;
 	bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_MOD_PENDING);
 }
 
-void bt_mesh_model_pub_store(struct bt_mesh_model *mod)
+void bt_mesh_model_pub_store(const struct bt_mesh_model *mod)
 {
-	mod->flags |= BT_MESH_MOD_PUB_PENDING;
+	*(mod->flags) |= BT_MESH_MOD_PUB_PENDING;
 	bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_MOD_PENDING);
 }
 
@@ -2401,7 +2404,7 @@ int bt_mesh_comp_read(struct net_buf_simple *buf, uint8_t page)
 	return 0;
 }
 
-int bt_mesh_model_data_store(struct bt_mesh_model *mod, bool vnd,
+int bt_mesh_model_data_store(const struct bt_mesh_model *mod, bool vnd,
 			     const char *name, const void *data,
 			     size_t data_len)
 {
@@ -2550,7 +2553,7 @@ int bt_mesh_models_metadata_change_prepare(void)
 #endif
 }
 
-static void commit_mod(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void commit_mod(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 		       bool vnd, bool primary, void *user_data)
 {
 	if (mod->pub && mod->pub->update &&
@@ -2579,9 +2582,9 @@ void bt_mesh_model_settings_commit(void)
 	bt_mesh_model_foreach(commit_mod, NULL);
 }
 
-void bt_mesh_model_data_store_schedule(struct bt_mesh_model *mod)
+void bt_mesh_model_data_store_schedule(const struct bt_mesh_model *mod)
 {
-	mod->flags |= BT_MESH_MOD_DATA_PENDING;
+	*(mod->flags) |= BT_MESH_MOD_DATA_PENDING;
 	bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_MOD_PENDING);
 }
 
diff --git a/subsys/bluetooth/mesh/access.h b/subsys/bluetooth/mesh/access.h
index f58c6f1d449..663f99c84d2 100644
--- a/subsys/bluetooth/mesh/access.h
+++ b/subsys/bluetooth/mesh/access.h
@@ -32,23 +32,23 @@ int bt_mesh_metadata_get_page_0(struct net_buf_simple *buf, size_t offset);
 struct bt_mesh_elem *bt_mesh_elem_find(uint16_t addr);
 
 bool bt_mesh_has_addr(uint16_t addr);
-bool bt_mesh_model_has_key(struct bt_mesh_model *mod, uint16_t key);
+bool bt_mesh_model_has_key(const struct bt_mesh_model *mod, uint16_t key);
 
-void bt_mesh_model_extensions_walk(struct bt_mesh_model *root,
-				   enum bt_mesh_walk (*cb)(struct bt_mesh_model *mod,
+void bt_mesh_model_extensions_walk(const struct bt_mesh_model *root,
+				   enum bt_mesh_walk (*cb)(const struct bt_mesh_model *mod,
 							   void *user_data),
 				   void *user_data);
 
-uint16_t *bt_mesh_model_find_group(struct bt_mesh_model **mod, uint16_t addr);
-const uint8_t **bt_mesh_model_find_uuid(struct bt_mesh_model **mod, const uint8_t *uuid);
+uint16_t *bt_mesh_model_find_group(const struct bt_mesh_model **mod, uint16_t addr);
+const uint8_t **bt_mesh_model_find_uuid(const struct bt_mesh_model **mod, const uint8_t *uuid);
 
-void bt_mesh_model_foreach(void (*func)(struct bt_mesh_model *mod,
+void bt_mesh_model_foreach(void (*func)(const struct bt_mesh_model *mod,
 					struct bt_mesh_elem *elem,
 					bool vnd, bool primary,
 					void *user_data),
 			   void *user_data);
 
-int32_t bt_mesh_model_pub_period_get(struct bt_mesh_model *mod);
+int32_t bt_mesh_model_pub_period_get(const struct bt_mesh_model *mod);
 
 void bt_mesh_comp_provision(uint16_t addr);
 void bt_mesh_comp_unprovision(void);
@@ -57,7 +57,7 @@ uint16_t bt_mesh_primary_addr(void);
 
 const struct bt_mesh_comp *bt_mesh_comp_get(void);
 
-struct bt_mesh_model *bt_mesh_model_get(bool vnd, uint8_t elem_idx, uint8_t mod_idx);
+const struct bt_mesh_model *bt_mesh_model_get(bool vnd, uint8_t elem_idx, uint8_t mod_idx);
 
 int bt_mesh_model_recv(struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf);
 
@@ -74,9 +74,9 @@ void bt_mesh_comp_data_clear(void);
 int bt_mesh_comp_data_get_page(struct net_buf_simple *buf, size_t page, size_t offset);
 
 void bt_mesh_model_pending_store(void);
-void bt_mesh_model_bind_store(struct bt_mesh_model *mod);
-void bt_mesh_model_sub_store(struct bt_mesh_model *mod);
-void bt_mesh_model_pub_store(struct bt_mesh_model *mod);
+void bt_mesh_model_bind_store(const struct bt_mesh_model *mod);
+void bt_mesh_model_sub_store(const struct bt_mesh_model *mod);
+void bt_mesh_model_pub_store(const struct bt_mesh_model *mod);
 void bt_mesh_model_settings_commit(void);
 
 /** @brief Register a callback function hook for mesh model messages.
diff --git a/subsys/bluetooth/mesh/blob_cli.c b/subsys/bluetooth/mesh/blob_cli.c
index 0effbf61be7..4fd0fe7bac9 100644
--- a/subsys/bluetooth/mesh/blob_cli.c
+++ b/subsys/bluetooth/mesh/blob_cli.c
@@ -1204,10 +1204,10 @@ static void rx_block_status(struct bt_mesh_blob_cli *cli,
 	blob_cli_broadcast_rsp(cli, target);
 }
 
-static int handle_xfer_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_xfer_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 	enum bt_mesh_blob_xfer_phase expected_phase;
 	struct bt_mesh_blob_target *target;
 	struct bt_mesh_blob_xfer_info info = { 0 };
@@ -1276,10 +1276,10 @@ static int handle_xfer_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_block_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_block_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 	struct block_status status = {
 		.status = BT_MESH_BLOB_SUCCESS,
 		.block.number = cli->block.number,
@@ -1330,10 +1330,10 @@ static int handle_block_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_block_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_block_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 	struct bt_mesh_blob_target *target;
 	struct block_status status = { 0 };
 	uint8_t status_and_format;
@@ -1401,10 +1401,10 @@ static int handle_block_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_info_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_info_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 	struct bt_mesh_blob_cli_caps caps;
 	enum bt_mesh_blob_status status;
 	struct bt_mesh_blob_target *target;
@@ -1458,9 +1458,9 @@ const struct bt_mesh_model_op _bt_mesh_blob_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int blob_cli_init(struct bt_mesh_model *mod)
+static int blob_cli_init(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 
 	cli->mod = mod;
 
@@ -1471,9 +1471,9 @@ static int blob_cli_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void blob_cli_reset(struct bt_mesh_model *mod)
+static void blob_cli_reset(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_blob_cli *cli = mod->user_data;
+	struct bt_mesh_blob_cli *cli = *(mod->user_data);
 
 	cli_state_reset(cli);
 }
diff --git a/subsys/bluetooth/mesh/blob_srv.c b/subsys/bluetooth/mesh/blob_srv.c
index 1e6cb9bc91a..2fee121415d 100644
--- a/subsys/bluetooth/mesh/blob_srv.c
+++ b/subsys/bluetooth/mesh/blob_srv.c
@@ -415,10 +415,10 @@ static void block_status_rsp(struct bt_mesh_blob_srv *srv,
 	(void)bt_mesh_model_send(srv->mod, ctx, &buf, NULL, NULL);
 }
 
-static int handle_xfer_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_xfer_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 
 	LOG_DBG("");
 
@@ -435,10 +435,10 @@ static int handle_xfer_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ct
 	return 0;
 }
 
-static int handle_xfer_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_xfer_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	enum bt_mesh_blob_status status;
 	enum bt_mesh_blob_xfer_mode mode;
 	uint64_t id;
@@ -566,11 +566,11 @@ rsp:
 	return 0;
 }
 
-static int handle_xfer_cancel(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_xfer_cancel(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
 	enum bt_mesh_blob_status status = BT_MESH_BLOB_SUCCESS;
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	uint64_t id;
 
 	id = net_buf_simple_pull_le64(buf);
@@ -594,11 +594,11 @@ rsp:
 	return 0;
 }
 
-static int handle_block_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_block_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
 	enum bt_mesh_blob_status status;
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 
 	switch (srv->phase) {
 	case BT_MESH_BLOB_XFER_PHASE_WAITING_FOR_BLOCK:
@@ -625,10 +625,10 @@ static int handle_block_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *c
 	return 0;
 }
 
-static int handle_block_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_block_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	enum bt_mesh_blob_status status;
 	uint16_t block_number, chunk_size;
 	int err;
@@ -720,10 +720,10 @@ rsp:
 	return 0;
 }
 
-static int handle_chunk(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_chunk(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	struct bt_mesh_blob_chunk chunk;
 	size_t expected_size = 0;
 	uint16_t idx;
@@ -810,10 +810,10 @@ static int handle_chunk(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int handle_info_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_info_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 
 	LOG_DBG("");
 
@@ -847,9 +847,9 @@ const struct bt_mesh_model_op _bt_mesh_blob_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int blob_srv_init(struct bt_mesh_model *mod)
+static int blob_srv_init(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 
 	srv->mod = mod;
 	srv->state.ttl = BT_MESH_TTL_DEFAULT;
@@ -861,11 +861,11 @@ static int blob_srv_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static int blob_srv_settings_set(struct bt_mesh_model *mod, const char *name,
+static int blob_srv_settings_set(const struct bt_mesh_model *mod, const char *name,
 				 size_t len_rd, settings_read_cb read_cb,
 				 void *cb_arg)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	ssize_t len;
 
 	if (len_rd < offsetof(struct bt_mesh_blob_srv_state, blocks)) {
@@ -903,9 +903,9 @@ static int blob_srv_settings_set(struct bt_mesh_model *mod, const char *name,
 	return 0;
 }
 
-static int blob_srv_start(struct bt_mesh_model *mod)
+static int blob_srv_start(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 	int err = -ENOTSUP;
 
 	if (srv->phase == BT_MESH_BLOB_XFER_PHASE_INACTIVE) {
@@ -931,9 +931,9 @@ static int blob_srv_start(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void blob_srv_reset(struct bt_mesh_model *mod)
+static void blob_srv_reset(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_blob_srv *srv = mod->user_data;
+	struct bt_mesh_blob_srv *srv = *(mod->user_data);
 
 	phase_set(srv, BT_MESH_BLOB_XFER_PHASE_INACTIVE);
 	srv->state.xfer.mode = BT_MESH_BLOB_XFER_MODE_NONE;
diff --git a/subsys/bluetooth/mesh/cfg_cli.c b/subsys/bluetooth/mesh/cfg_cli.c
index 7ee3a590cd0..2f05fea2f15 100644
--- a/subsys/bluetooth/mesh/cfg_cli.c
+++ b/subsys/bluetooth/mesh/cfg_cli.c
@@ -48,7 +48,7 @@ static int32_t msg_timeout;
 
 static struct bt_mesh_cfg_cli *cli;
 
-static int comp_data_status(struct bt_mesh_model *model,
+static int comp_data_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -85,7 +85,7 @@ static int comp_data_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static uint8_t state_status_u8(struct bt_mesh_model *model,
+static uint8_t state_status_u8(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf,
 			   uint32_t expect_status)
@@ -111,7 +111,7 @@ static uint8_t state_status_u8(struct bt_mesh_model *model,
 	return status;
 }
 
-static int beacon_status(struct bt_mesh_model *model,
+static int beacon_status(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -126,7 +126,7 @@ static int beacon_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int ttl_status(struct bt_mesh_model *model,
+static int ttl_status(const struct bt_mesh_model *model,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
@@ -141,7 +141,7 @@ static int ttl_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int friend_status(struct bt_mesh_model *model,
+static int friend_status(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -156,7 +156,7 @@ static int friend_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gatt_proxy_status(struct bt_mesh_model *model,
+static int gatt_proxy_status(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -178,7 +178,7 @@ struct krp_param {
 	uint8_t *phase;
 };
 
-static int krp_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int krp_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	int err = 0;
@@ -223,7 +223,7 @@ struct relay_param {
 	uint8_t *transmit;
 };
 
-static int relay_status(struct bt_mesh_model *model,
+static int relay_status(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
@@ -257,7 +257,7 @@ static int relay_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int net_transmit_status(struct bt_mesh_model *model,
+static int net_transmit_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -277,7 +277,7 @@ struct net_key_param {
 	uint16_t net_idx;
 };
 
-static int net_key_status(struct bt_mesh_model *model,
+static int net_key_status(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -345,7 +345,7 @@ int bt_mesh_key_idx_unpack_list(struct net_buf_simple *buf, uint16_t *dst_arr,
 	return buf->len > 0 ? -EMSGSIZE : 0;
 }
 
-static int net_key_list(struct bt_mesh_model *model,
+static int net_key_list(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
@@ -381,7 +381,7 @@ done:
 	return err;
 }
 
-static int node_reset_status(struct bt_mesh_model *model,
+static int node_reset_status(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -412,7 +412,7 @@ struct app_key_param {
 	uint16_t app_idx;
 };
 
-static int app_key_status(struct bt_mesh_model *model,
+static int app_key_status(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -461,7 +461,7 @@ struct app_key_list_param {
 	size_t *key_cnt;
 };
 
-static int app_key_list(struct bt_mesh_model *model,
+static int app_key_list(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
@@ -521,7 +521,7 @@ struct mod_app_param {
 	uint16_t cid;
 };
 
-static int mod_app_status(struct bt_mesh_model *model,
+static int mod_app_status(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -695,7 +695,7 @@ done:
 	return err;
 }
 
-static int mod_app_list(struct bt_mesh_model *model,
+static int mod_app_list(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf)
 {
 	LOG_DBG("net_idx 0x%04x app_idx 0x%04x src 0x%04x len %u: %s", ctx->net_idx, ctx->app_idx,
@@ -704,7 +704,7 @@ static int mod_app_list(struct bt_mesh_model *model,
 	return mod_app_list_handle(ctx, buf, OP_SIG_MOD_APP_LIST, false);
 }
 
-static int mod_app_list_vnd(struct bt_mesh_model *model,
+static int mod_app_list_vnd(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -722,7 +722,7 @@ struct mod_pub_param {
 	struct bt_mesh_cfg_cli_mod_pub *pub;
 };
 
-static int mod_pub_status(struct bt_mesh_model *model,
+static int mod_pub_status(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -807,7 +807,7 @@ struct mod_sub_param {
 	uint16_t cid;
 };
 
-static int mod_sub_status(struct bt_mesh_model *model,
+static int mod_sub_status(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -866,7 +866,7 @@ done:
 	return err;
 }
 
-static int mod_sub_list(struct bt_mesh_model *model,
+static int mod_sub_list(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf)
 {
 	LOG_DBG("net_idx 0x%04x app_idx 0x%04x src 0x%04x len %u: %s", ctx->net_idx, ctx->app_idx,
@@ -875,7 +875,7 @@ static int mod_sub_list(struct bt_mesh_model *model,
 	return mod_sub_list_handle(ctx, buf, OP_MOD_SUB_LIST, false);
 }
 
-static int mod_sub_list_vnd(struct bt_mesh_model *model,
+static int mod_sub_list_vnd(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -890,7 +890,7 @@ struct hb_sub_param {
 	struct bt_mesh_cfg_cli_hb_sub *sub;
 };
 
-static int hb_sub_status(struct bt_mesh_model *model,
+static int hb_sub_status(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -934,7 +934,7 @@ struct hb_pub_param {
 	struct bt_mesh_cfg_cli_hb_pub *pub;
 };
 
-static int hb_pub_status(struct bt_mesh_model *model,
+static int hb_pub_status(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -979,7 +979,7 @@ struct node_idt_param {
 	uint8_t *identity;
 };
 
-static int node_identity_status(struct bt_mesh_model *model,
+static int node_identity_status(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -1020,7 +1020,7 @@ struct lpn_timeout_param {
 	int32_t *polltimeout;
 };
 
-static int lpn_timeout_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int lpn_timeout_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
 	struct lpn_timeout_param *param;
@@ -1087,19 +1087,19 @@ const struct bt_mesh_model_op bt_mesh_cfg_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int cfg_cli_init(struct bt_mesh_model *model)
+static int cfg_cli_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Configuration Client only allowed in primary element");
 		return -EINVAL;
 	}
 
-	if (!model->user_data) {
+	if (!*(model->user_data)) {
 		LOG_ERR("No Configuration Client context provided");
 		return -EINVAL;
 	}
 
-	cli = model->user_data;
+	cli = *(model->user_data);
 	cli->model = model;
 	msg_timeout = CONFIG_BT_MESH_CFG_CLI_TIMEOUT;
 
@@ -1108,7 +1108,7 @@ static int cfg_cli_init(struct bt_mesh_model *model)
 	 * and remote keys are allowed to access this model.
 	 */
 	model->keys[0] = BT_MESH_KEY_DEV_ANY;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);
 
diff --git a/subsys/bluetooth/mesh/cfg_srv.c b/subsys/bluetooth/mesh/cfg_srv.c
index 1684748ba83..5920ecd6dc1 100644
--- a/subsys/bluetooth/mesh/cfg_srv.c
+++ b/subsys/bluetooth/mesh/cfg_srv.c
@@ -48,7 +48,7 @@ static void node_reset_pending_handler(struct k_work *work)
 
 static K_WORK_DEFINE(node_reset_pending, node_reset_pending_handler);
 
-static int dev_comp_data_get(struct bt_mesh_model *model,
+static int dev_comp_data_get(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -86,7 +86,7 @@ static int dev_comp_data_get(struct bt_mesh_model *model,
 	return err;
 }
 
-static struct bt_mesh_model *get_model(struct bt_mesh_elem *elem,
+static const struct bt_mesh_model *get_model(struct bt_mesh_elem *elem,
 				       struct net_buf_simple *buf, bool *vnd)
 {
 	if (buf->len < 4) {
@@ -113,9 +113,9 @@ static struct bt_mesh_model *get_model(struct bt_mesh_elem *elem,
 	}
 }
 
-static uint8_t _mod_pub_set(struct bt_mesh_model *model, uint16_t pub_addr, const uint8_t *uuid,
-			 uint16_t app_idx, uint8_t cred_flag, uint8_t ttl, uint8_t period,
-			 uint8_t retransmit, bool store)
+static uint8_t _mod_pub_set(const struct bt_mesh_model *model, uint16_t pub_addr,
+			    const uint8_t *uuid, uint16_t app_idx, uint8_t cred_flag,
+			    uint8_t ttl, uint8_t period, uint8_t retransmit, bool store)
 {
 	if (!model->pub) {
 		return STATUS_NVAL_PUB_PARAM;
@@ -199,7 +199,7 @@ static uint8_t _mod_pub_set(struct bt_mesh_model *model, uint16_t pub_addr, cons
 	return STATUS_SUCCESS;
 }
 
-static uint8_t mod_bind(struct bt_mesh_model *model, uint16_t key_idx)
+static uint8_t mod_bind(const struct bt_mesh_model *model, uint16_t key_idx)
 {
 	int i;
 
@@ -232,7 +232,7 @@ static uint8_t mod_bind(struct bt_mesh_model *model, uint16_t key_idx)
 	return STATUS_INSUFF_RESOURCES;
 }
 
-static uint8_t mod_unbind(struct bt_mesh_model *model, uint16_t key_idx, bool store)
+static uint8_t mod_unbind(const struct bt_mesh_model *model, uint16_t key_idx, bool store)
 {
 	int i;
 
@@ -284,7 +284,7 @@ static void key_idx_pack_list(struct net_buf_simple *buf, uint16_t *arr, size_t
 
 }
 
-static int send_app_key_status(struct bt_mesh_model *model,
+static int send_app_key_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       uint8_t status,
 			       uint16_t app_idx, uint16_t net_idx)
@@ -302,7 +302,7 @@ static int send_app_key_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int app_key_add(struct bt_mesh_model *model,
+static int app_key_add(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -318,7 +318,7 @@ static int app_key_add(struct bt_mesh_model *model,
 	return send_app_key_status(model, ctx, status, key_app_idx, key_net_idx);
 }
 
-static int app_key_update(struct bt_mesh_model *model,
+static int app_key_update(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -335,7 +335,7 @@ static int app_key_update(struct bt_mesh_model *model,
 	return send_app_key_status(model, ctx, status, key_app_idx, key_net_idx);
 }
 
-static void mod_app_key_del(struct bt_mesh_model *mod,
+static void mod_app_key_del(const struct bt_mesh_model *mod,
 			    struct bt_mesh_elem *elem, bool vnd, bool primary,
 			    void *user_data)
 {
@@ -354,7 +354,7 @@ static void app_key_evt(uint16_t app_idx, uint16_t net_idx,
 
 BT_MESH_APP_KEY_CB_DEFINE(app_key_evt);
 
-static int app_key_del(struct bt_mesh_model *model,
+static int app_key_del(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -373,7 +373,7 @@ static int app_key_del(struct bt_mesh_model *model,
 /* Index list length: 3 bytes for every pair and 2 bytes for an odd idx */
 #define IDX_LEN(num) (((num) / 2) * 3 + ((num) % 2) * 2)
 
-static int app_key_get(struct bt_mesh_model *model,
+static int app_key_get(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -422,7 +422,7 @@ send_status:
 	return 0;
 }
 
-static int beacon_get(struct bt_mesh_model *model,
+static int beacon_get(const struct bt_mesh_model *model,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
@@ -441,7 +441,7 @@ static int beacon_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int beacon_set(struct bt_mesh_model *model,
+static int beacon_set(const struct bt_mesh_model *model,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
@@ -467,7 +467,7 @@ static int beacon_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int default_ttl_get(struct bt_mesh_model *model,
+static int default_ttl_get(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
@@ -486,7 +486,7 @@ static int default_ttl_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int default_ttl_set(struct bt_mesh_model *model,
+static int default_ttl_set(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
@@ -512,7 +512,7 @@ static int default_ttl_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int send_gatt_proxy_status(struct bt_mesh_model *model,
+static int send_gatt_proxy_status(const struct bt_mesh_model *model,
 				  struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_GATT_PROXY_STATUS, 1);
@@ -527,7 +527,7 @@ static int send_gatt_proxy_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int gatt_proxy_get(struct bt_mesh_model *model,
+static int gatt_proxy_get(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -537,7 +537,7 @@ static int gatt_proxy_get(struct bt_mesh_model *model,
 	return send_gatt_proxy_status(model, ctx);
 }
 
-static int gatt_proxy_set(struct bt_mesh_model *model,
+static int gatt_proxy_set(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -561,7 +561,7 @@ static int gatt_proxy_set(struct bt_mesh_model *model,
 	return send_gatt_proxy_status(model, ctx);
 }
 
-static int net_transmit_get(struct bt_mesh_model *model,
+static int net_transmit_get(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -580,7 +580,7 @@ static int net_transmit_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int net_transmit_set(struct bt_mesh_model *model,
+static int net_transmit_set(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -604,7 +604,7 @@ static int net_transmit_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int relay_get(struct bt_mesh_model *model,
+static int relay_get(const struct bt_mesh_model *model,
 		     struct bt_mesh_msg_ctx *ctx,
 		     struct net_buf_simple *buf)
 {
@@ -624,7 +624,7 @@ static int relay_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int relay_set(struct bt_mesh_model *model,
+static int relay_set(const struct bt_mesh_model *model,
 		     struct bt_mesh_msg_ctx *ctx,
 		     struct net_buf_simple *buf)
 {
@@ -651,10 +651,10 @@ static int relay_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int send_mod_pub_status(struct bt_mesh_model *cfg_mod,
+static int send_mod_pub_status(const struct bt_mesh_model *cfg_mod,
 			       struct bt_mesh_msg_ctx *ctx, uint16_t elem_addr,
 			       uint16_t pub_addr, bool vnd,
-			       struct bt_mesh_model *mod, uint8_t status,
+			       const struct bt_mesh_model *mod, uint8_t status,
 			       uint8_t *mod_id)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_MOD_PUB_STATUS, 14);
@@ -691,11 +691,11 @@ static int send_mod_pub_status(struct bt_mesh_model *cfg_mod,
 	return 0;
 }
 
-static int mod_pub_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mod_pub_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint16_t elem_addr, pub_addr = 0U;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id, status;
 	bool vnd;
@@ -742,13 +742,13 @@ send_status:
 				   status, mod_id);
 }
 
-static int mod_pub_set(struct bt_mesh_model *model,
+static int mod_pub_set(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint8_t retransmit, status, pub_ttl, pub_period, cred_flag;
 	uint16_t elem_addr, pub_addr, pub_app_idx;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id;
 	bool vnd;
@@ -807,7 +807,7 @@ send_status:
 				   status, mod_id);
 }
 
-static size_t mod_sub_list_clear(struct bt_mesh_model *mod)
+static size_t mod_sub_list_clear(const struct bt_mesh_model *mod)
 {
 	size_t clear_count;
 	int i;
@@ -838,7 +838,7 @@ static size_t mod_sub_list_clear(struct bt_mesh_model *mod)
 	return clear_count;
 }
 
-static int mod_pub_va_set(struct bt_mesh_model *model,
+static int mod_pub_va_set(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -846,7 +846,7 @@ static int mod_pub_va_set(struct bt_mesh_model *model,
 	uint8_t retransmit, status, pub_ttl, pub_period, cred_flag;
 	uint16_t elem_addr, pub_app_idx;
 	uint16_t pub_addr = 0U;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	const uint8_t *uuid;
 	uint8_t *mod_id;
@@ -915,7 +915,7 @@ send_status:
 				   status, mod_id);
 }
 
-static int send_mod_sub_status(struct bt_mesh_model *model,
+static int send_mod_sub_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx, uint8_t status,
 			       uint16_t elem_addr, uint16_t sub_addr, uint8_t *mod_id,
 			       bool vnd)
@@ -943,12 +943,12 @@ static int send_mod_sub_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int mod_sub_add(struct bt_mesh_model *model,
+static int mod_sub_add(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint16_t elem_addr, sub_addr;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id;
 	uint8_t status;
@@ -1021,12 +1021,12 @@ send_status:
 				   mod_id, vnd);
 }
 
-static int mod_sub_del(struct bt_mesh_model *model,
+static int mod_sub_del(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint16_t elem_addr, sub_addr;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id;
 	uint16_t *match;
@@ -1092,7 +1092,7 @@ send_status:
 				   mod_id, vnd);
 }
 
-static enum bt_mesh_walk mod_sub_clear_visitor(struct bt_mesh_model *mod, void *user_data)
+static enum bt_mesh_walk mod_sub_clear_visitor(const struct bt_mesh_model *mod, void *user_data)
 {
 	if (IS_ENABLED(CONFIG_BT_MESH_LOW_POWER)) {
 		bt_mesh_lpn_group_del(mod->groups, mod->groups_cnt);
@@ -1103,12 +1103,12 @@ static enum bt_mesh_walk mod_sub_clear_visitor(struct bt_mesh_model *mod, void *
 	return BT_MESH_WALK_CONTINUE;
 }
 
-static int mod_sub_overwrite(struct bt_mesh_model *model,
+static int mod_sub_overwrite(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
 	uint16_t elem_addr, sub_addr;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id;
 	uint8_t status;
@@ -1174,11 +1174,11 @@ send_status:
 				   mod_id, vnd);
 }
 
-static int mod_sub_del_all(struct bt_mesh_model *model,
+static int mod_sub_del_all(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint16_t elem_addr;
 	uint8_t *mod_id;
@@ -1232,13 +1232,13 @@ struct mod_sub_list_ctx {
 	struct net_buf_simple *msg;
 };
 
-static enum bt_mesh_walk mod_sub_list_visitor(struct bt_mesh_model *mod, void *ctx)
+static enum bt_mesh_walk mod_sub_list_visitor(const struct bt_mesh_model *mod, void *ctx)
 {
 	struct mod_sub_list_ctx *visit = ctx;
 	int count = 0;
 	int i;
 
-	if (mod->elem_idx != visit->elem_idx) {
+	if (*(mod->elem_idx) != visit->elem_idx) {
 		return BT_MESH_WALK_CONTINUE;
 	}
 
@@ -1257,18 +1257,18 @@ static enum bt_mesh_walk mod_sub_list_visitor(struct bt_mesh_model *mod, void *c
 		count++;
 	}
 
-	LOG_DBG("sublist: model %u:%x: %u groups", mod->elem_idx, mod->id, count);
+	LOG_DBG("sublist: model %u:%x: %u groups", *(mod->elem_idx), mod->id, count);
 
 	return BT_MESH_WALK_CONTINUE;
 }
 
-static int mod_sub_get(struct bt_mesh_model *model,
+static int mod_sub_get(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(msg, BT_MESH_TX_SDU_MAX);
 	struct mod_sub_list_ctx visit_ctx;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint16_t addr, id;
 
@@ -1306,7 +1306,7 @@ static int mod_sub_get(struct bt_mesh_model *model,
 	net_buf_simple_add_le16(&msg, id);
 
 	visit_ctx.msg = &msg;
-	visit_ctx.elem_idx = mod->elem_idx;
+	visit_ctx.elem_idx = *(mod->elem_idx);
 	bt_mesh_model_extensions_walk(mod, mod_sub_list_visitor, &visit_ctx);
 
 send_list:
@@ -1317,13 +1317,13 @@ send_list:
 	return 0;
 }
 
-static int mod_sub_get_vnd(struct bt_mesh_model *model,
+static int mod_sub_get_vnd(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(msg, BT_MESH_TX_SDU_MAX);
 	struct mod_sub_list_ctx visit_ctx;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint16_t company, addr, id;
 
@@ -1365,7 +1365,7 @@ static int mod_sub_get_vnd(struct bt_mesh_model *model,
 	net_buf_simple_add_le16(&msg, id);
 
 	visit_ctx.msg = &msg;
-	visit_ctx.elem_idx = mod->elem_idx;
+	visit_ctx.elem_idx = *(mod->elem_idx);
 	bt_mesh_model_extensions_walk(mod, mod_sub_list_visitor, &visit_ctx);
 
 send_list:
@@ -1376,13 +1376,13 @@ send_list:
 	return 0;
 }
 
-static int mod_sub_va_add(struct bt_mesh_model *model,
+static int mod_sub_va_add(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
 	const struct bt_mesh_va *va;
 	uint16_t elem_addr, sub_addr = BT_MESH_ADDR_UNASSIGNED;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	const uint8_t *uuid;
 	uint8_t *mod_id;
@@ -1478,13 +1478,13 @@ send_status:
 				   mod_id, vnd);
 }
 
-static int mod_sub_va_del(struct bt_mesh_model *model,
+static int mod_sub_va_del(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
 	const struct bt_mesh_va *va;
 	uint16_t elem_addr, sub_addr = BT_MESH_ADDR_UNASSIGNED;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	const uint8_t *uuid;
 	uint8_t *mod_id;
@@ -1562,13 +1562,13 @@ send_status:
 				   mod_id, vnd);
 }
 
-static int mod_sub_va_overwrite(struct bt_mesh_model *model,
+static int mod_sub_va_overwrite(const struct bt_mesh_model *model,
 				struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	const struct bt_mesh_va *va;
 	uint16_t elem_addr, sub_addr = BT_MESH_ADDR_UNASSIGNED;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	const uint8_t *uuid;
 	uint8_t *mod_id;
@@ -1638,7 +1638,7 @@ send_status:
 				   mod_id, vnd);
 }
 
-static int send_net_key_status(struct bt_mesh_model *model,
+static int send_net_key_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx, uint16_t idx,
 			       uint8_t status)
 {
@@ -1656,7 +1656,7 @@ static int send_net_key_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int net_key_add(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int net_key_add(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint8_t status;
@@ -1675,7 +1675,7 @@ static int net_key_add(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return send_net_key_status(model, ctx, idx, status);
 }
 
-static int net_key_update(struct bt_mesh_model *model,
+static int net_key_update(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
@@ -1693,7 +1693,7 @@ static int net_key_update(struct bt_mesh_model *model,
 	return send_net_key_status(model, ctx, idx, status);
 }
 
-static int net_key_del(struct bt_mesh_model *model,
+static int net_key_del(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -1720,7 +1720,7 @@ static int net_key_del(struct bt_mesh_model *model,
 	return send_net_key_status(model, ctx, del_idx, STATUS_SUCCESS);
 }
 
-static int net_key_get(struct bt_mesh_model *model,
+static int net_key_get(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -1745,7 +1745,7 @@ static int net_key_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int send_node_id_status(struct bt_mesh_model *model,
+static int send_node_id_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       uint8_t status,
 			       uint16_t net_idx, uint8_t node_id)
@@ -1764,7 +1764,7 @@ static int send_node_id_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int node_identity_get(struct bt_mesh_model *model,
+static int node_identity_get(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -1786,7 +1786,7 @@ static int node_identity_get(struct bt_mesh_model *model,
 	return send_node_id_status(model, ctx, status, idx, node_id);
 }
 
-static int node_identity_set(struct bt_mesh_model *model,
+static int node_identity_set(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -1824,7 +1824,7 @@ static int node_identity_set(struct bt_mesh_model *model,
 }
 
 static void create_mod_app_status(struct net_buf_simple *msg,
-				  struct bt_mesh_model *mod, bool vnd,
+				  const struct bt_mesh_model *mod, bool vnd,
 				  uint16_t elem_addr, uint16_t app_idx,
 				  uint8_t status, uint8_t *mod_id)
 {
@@ -1841,13 +1841,13 @@ static void create_mod_app_status(struct net_buf_simple *msg,
 	}
 }
 
-static int mod_app_bind(struct bt_mesh_model *model,
+static int mod_app_bind(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_MOD_APP_STATUS, 9);
 	uint16_t elem_addr, key_app_idx;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id, status;
 	bool vnd;
@@ -1881,7 +1881,7 @@ static int mod_app_bind(struct bt_mesh_model *model,
 	}
 
 	/* Some models only allow device key based access */
-	if (mod->flags & BT_MESH_MOD_DEVKEY_ONLY) {
+	if (*(mod->flags) & BT_MESH_MOD_DEVKEY_ONLY) {
 		LOG_ERR("Client tried to bind AppKey to DevKey based model");
 		status = STATUS_CANNOT_BIND;
 		goto send_status;
@@ -1905,13 +1905,13 @@ send_status:
 	return 0;
 }
 
-static int mod_app_unbind(struct bt_mesh_model *model,
+static int mod_app_unbind(const struct bt_mesh_model *model,
 			  struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_MOD_APP_STATUS, 9);
 	uint16_t elem_addr, key_app_idx;
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id, status;
 	bool vnd;
@@ -1964,7 +1964,7 @@ send_status:
 
 #define KEY_LIST_LEN (CONFIG_BT_MESH_MODEL_KEY_COUNT * 2)
 
-static int mod_app_get(struct bt_mesh_model *model,
+static int mod_app_get(const struct bt_mesh_model *model,
 		       struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
@@ -1973,7 +1973,7 @@ static int mod_app_get(struct bt_mesh_model *model,
 							9 + KEY_LIST_LEN),
 				  BT_MESH_MODEL_BUF_LEN(OP_SIG_MOD_APP_LIST,
 							9 + KEY_LIST_LEN)));
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 	struct bt_mesh_elem *elem;
 	uint8_t *mod_id, status;
 	uint16_t elem_addr;
@@ -2050,7 +2050,7 @@ static void reset_send_end(int err, void *cb_data)
 	k_work_submit(&node_reset_pending);
 }
 
-static int node_reset(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int node_reset(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
 	static const struct bt_mesh_send_cb reset_cb = {
@@ -2072,7 +2072,7 @@ static int node_reset(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int send_friend_status(struct bt_mesh_model *model,
+static int send_friend_status(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_FRIEND_STATUS, 1);
@@ -2087,7 +2087,7 @@ static int send_friend_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int friend_get(struct bt_mesh_model *model,
+static int friend_get(const struct bt_mesh_model *model,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
@@ -2097,7 +2097,7 @@ static int friend_get(struct bt_mesh_model *model,
 	return send_friend_status(model, ctx);
 }
 
-static int friend_set(struct bt_mesh_model *model,
+static int friend_set(const struct bt_mesh_model *model,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
@@ -2114,7 +2114,7 @@ static int friend_set(struct bt_mesh_model *model,
 	return send_friend_status(model, ctx);
 }
 
-static int lpn_timeout_get(struct bt_mesh_model *model,
+static int lpn_timeout_get(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
@@ -2160,7 +2160,7 @@ send_rsp:
 	return 0;
 }
 
-static int send_krp_status(struct bt_mesh_model *model,
+static int send_krp_status(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx, uint16_t idx,
 			   uint8_t phase, uint8_t status)
 {
@@ -2179,7 +2179,7 @@ static int send_krp_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int krp_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int krp_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		    struct net_buf_simple *buf)
 {
 	uint8_t kr_phase, status;
@@ -2198,7 +2198,7 @@ static int krp_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return send_krp_status(model, ctx, idx, kr_phase, status);
 }
 
-static int krp_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int krp_set(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		   struct net_buf_simple *buf)
 {
 	uint8_t phase, status;
@@ -2254,7 +2254,7 @@ struct hb_pub_param {
 	uint16_t net_idx;
 } __packed;
 
-static int hb_pub_send_status(struct bt_mesh_model *model,
+static int hb_pub_send_status(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx, uint8_t status,
 			      const struct bt_mesh_hb_pub *pub)
 {
@@ -2284,7 +2284,7 @@ static int hb_pub_send_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int heartbeat_pub_get(struct bt_mesh_model *model,
+static int heartbeat_pub_get(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2297,7 +2297,7 @@ static int heartbeat_pub_get(struct bt_mesh_model *model,
 	return hb_pub_send_status(model, ctx, STATUS_SUCCESS, &pub);
 }
 
-static int heartbeat_pub_set(struct bt_mesh_model *model,
+static int heartbeat_pub_set(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -2357,7 +2357,7 @@ rsp:
 	return hb_pub_send_status(model, ctx, status, &pub);
 }
 
-static int hb_sub_send_status(struct bt_mesh_model *model,
+static int hb_sub_send_status(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      const struct bt_mesh_hb_sub *sub)
 {
@@ -2382,7 +2382,7 @@ static int hb_sub_send_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int heartbeat_sub_get(struct bt_mesh_model *model,
+static int heartbeat_sub_get(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -2395,7 +2395,7 @@ static int heartbeat_sub_get(struct bt_mesh_model *model,
 	return hb_sub_send_status(model, ctx, &sub);
 }
 
-static int heartbeat_sub_set(struct bt_mesh_model *model,
+static int heartbeat_sub_set(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -2508,7 +2508,7 @@ const struct bt_mesh_model_op bt_mesh_cfg_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int cfg_srv_init(struct bt_mesh_model *model)
+static int cfg_srv_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Configuration Server only allowed in primary element");
@@ -2520,7 +2520,7 @@ static int cfg_srv_init(struct bt_mesh_model *model)
 	 * device-key is allowed to access this model.
 	 */
 	model->keys[0] = BT_MESH_KEY_DEV_LOCAL;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	return 0;
 }
@@ -2529,7 +2529,7 @@ const struct bt_mesh_model_cb bt_mesh_cfg_srv_cb = {
 	.init = cfg_srv_init,
 };
 
-static void mod_reset(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void mod_reset(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 		      bool vnd, bool primary, void *user_data)
 {
 	size_t clear_count;
diff --git a/subsys/bluetooth/mesh/dfd_srv.c b/subsys/bluetooth/mesh/dfd_srv.c
index 0a9ecba6cec..245052b58f8 100644
--- a/subsys/bluetooth/mesh/dfd_srv.c
+++ b/subsys/bluetooth/mesh/dfd_srv.c
@@ -112,11 +112,11 @@ static void receivers_status_rsp(struct bt_mesh_dfd_srv *srv,
 	bt_mesh_model_send(srv->mod, ctx, &buf, NULL, NULL);
 }
 
-static int handle_receivers_add(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_receivers_add(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	enum bt_mesh_dfd_status status = BT_MESH_DFD_SUCCESS;
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	if (buf->len % 3) {
 		return -EINVAL;
@@ -143,20 +143,20 @@ static int handle_receivers_add(struct bt_mesh_model *mod, struct bt_mesh_msg_ct
 	return 0;
 }
 
-static int handle_receivers_delete_all(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_receivers_delete_all(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	receivers_status_rsp(srv, ctx, bt_mesh_dfd_srv_receivers_delete_all(srv));
 
 	return 0;
 }
 
-static int handle_receivers_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_receivers_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	uint16_t first, cnt;
 	uint8_t progress;
 	int i;
@@ -206,7 +206,7 @@ static enum bt_mesh_dfu_iter slot_space_cb(const struct bt_mesh_dfu_slot *slot,
 	return BT_MESH_DFU_ITER_CONTINUE;
 }
 
-static int handle_capabilities_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_capabilities_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
 	size_t size = 0;
@@ -226,7 +226,7 @@ static int handle_capabilities_get(struct bt_mesh_model *mod, struct bt_mesh_msg
 	net_buf_simple_add_le32(&rsp, CONFIG_BT_MESH_DFD_SRV_SLOT_SPACE - size);
 
 #ifdef CONFIG_BT_MESH_DFD_SRV_OOB_UPLOAD
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	if (srv->oob_schemes.count > 0) {
 		net_buf_simple_add_u8(&rsp, 1);
@@ -268,20 +268,20 @@ static void status_rsp(struct bt_mesh_dfd_srv *srv, struct bt_mesh_msg_ctx *ctx,
 	bt_mesh_model_send(srv->mod, ctx, &rsp, NULL, NULL);
 }
 
-static int handle_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	status_rsp(srv, ctx, BT_MESH_DFD_SUCCESS);
 
 	return 0;
 }
 
-static int handle_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	struct bt_mesh_dfd_start_params params;
 	uint8_t byte;
 
@@ -310,31 +310,31 @@ static int handle_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int handle_suspend(struct bt_mesh_model *mod,
+static int handle_suspend(const struct bt_mesh_model *mod,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	status_rsp(srv, ctx, bt_mesh_dfd_srv_suspend(srv));
 
 	return 0;
 }
 
-static int handle_cancel(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_cancel(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	bt_mesh_dfd_srv_cancel(srv, ctx);
 
 	return 0;
 }
 
-static int handle_apply(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_apply(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	status_rsp(srv, ctx, bt_mesh_dfd_srv_apply(srv));
 
@@ -393,10 +393,10 @@ static void upload_status_rsp(struct bt_mesh_dfd_srv *srv,
 	upload_status_rsp_with_progress(srv, ctx, status, progress);
 }
 
-static int handle_upload_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_upload_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	upload_status_rsp(srv, ctx, BT_MESH_DFD_SUCCESS);
 
@@ -438,10 +438,10 @@ static inline int set_upload_fwid(struct bt_mesh_dfd_srv *srv, struct bt_mesh_ms
 	return err;
 }
 
-static int handle_upload_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_upload_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	size_t meta_len, fwid_len, size;
 	const uint8_t *meta, *fwid;
 	uint16_t timeout_base;
@@ -560,10 +560,10 @@ static int handle_upload_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_upload_start_oob(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_upload_start_oob(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	uint8_t uri_len;
 	uint8_t *uri;
 	uint16_t fwid_len;
@@ -651,10 +651,10 @@ static int handle_upload_start_oob(struct bt_mesh_model *mod, struct bt_mesh_msg
 	return 0;
 }
 
-static int handle_upload_cancel(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_upload_cancel(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	srv->upload.phase = BT_MESH_DFD_UPLOAD_PHASE_IDLE;
 #ifdef CONFIG_BT_MESH_DFD_SRV_OOB_UPLOAD
@@ -690,10 +690,10 @@ static void fw_status_rsp(struct bt_mesh_dfd_srv *srv,
 	bt_mesh_model_send(srv->mod, ctx, &rsp, NULL, NULL);
 }
 
-static int handle_fw_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_fw_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	struct bt_mesh_dfu_slot *slot;
 	const uint8_t *fwid;
 	size_t fwid_len;
@@ -714,10 +714,10 @@ static int handle_fw_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int handle_fw_get_by_index(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_fw_get_by_index(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	const struct bt_mesh_dfu_slot *slot;
 	uint16_t idx;
 
@@ -735,10 +735,10 @@ static int handle_fw_get_by_index(struct bt_mesh_model *mod, struct bt_mesh_msg_
 	return 0;
 }
 
-static int handle_fw_delete(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_fw_delete(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 	const uint8_t *fwid;
 	size_t fwid_len;
 
@@ -764,10 +764,10 @@ static enum bt_mesh_dfu_iter slot_del_cb(const struct bt_mesh_dfu_slot *slot,
 	return BT_MESH_DFU_ITER_CONTINUE;
 }
 
-static int handle_fw_delete_all(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_fw_delete_all(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	fw_status_rsp(srv, ctx, bt_mesh_dfd_srv_fw_delete_all(srv), 0xffff, NULL, 0);
 
@@ -923,9 +923,9 @@ const struct bt_mesh_blob_srv_cb _bt_mesh_dfd_srv_blob_cb = {
 	.suspended = upload_timeout,
 };
 
-static int dfd_srv_init(struct bt_mesh_model *mod)
+static int dfd_srv_init(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	srv->mod = mod;
 
@@ -936,9 +936,9 @@ static int dfd_srv_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void dfd_srv_reset(struct bt_mesh_model *mod)
+static void dfd_srv_reset(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfd_srv *srv = mod->user_data;
+	struct bt_mesh_dfd_srv *srv = *(mod->user_data);
 
 	dfd_phase_set(srv, BT_MESH_DFD_PHASE_IDLE);
 	srv->upload.phase = BT_MESH_DFD_UPLOAD_PHASE_IDLE;
diff --git a/subsys/bluetooth/mesh/dfu_cli.c b/subsys/bluetooth/mesh/dfu_cli.c
index 3adb63644d0..70b03f4e814 100644
--- a/subsys/bluetooth/mesh/dfu_cli.c
+++ b/subsys/bluetooth/mesh/dfu_cli.c
@@ -305,8 +305,9 @@ static void tx_end(int err, void *cb_data)
 	blob_cli_broadcast_tx_complete(&cli->blob);
 }
 
-static int tx(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf,
-	      const struct bt_mesh_send_cb *cb, struct bt_mesh_dfu_cli *cli)
+static int tx(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+	      struct net_buf_simple *buf, const struct bt_mesh_send_cb *cb,
+	      struct bt_mesh_dfu_cli *cli)
 {
 	int err;
 
@@ -698,10 +699,10 @@ static void cancelled(struct bt_mesh_blob_cli *b)
  * Message handlers
  ******************************************************************************/
 
-static int handle_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_cli *cli = mod->user_data;
+	struct bt_mesh_dfu_cli *cli = *(mod->user_data);
 	enum bt_mesh_dfu_status status;
 	enum bt_mesh_dfu_phase phase;
 	struct bt_mesh_dfu_target *target;
@@ -824,10 +825,10 @@ static int handle_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int handle_info_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_info_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_cli *cli = mod->user_data;
+	struct bt_mesh_dfu_cli *cli = *(mod->user_data);
 	struct bt_mesh_dfu_target *target;
 	enum bt_mesh_dfu_iter it = BT_MESH_DFU_ITER_CONTINUE;
 	uint8_t img_cnt, idx;
@@ -923,10 +924,10 @@ static int handle_info_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_metadata_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_metadata_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_cli *cli = mod->user_data;
+	struct bt_mesh_dfu_cli *cli = *(mod->user_data);
 	struct bt_mesh_dfu_metadata_status *rsp = cli->req.params;
 	uint8_t hdr, idx;
 
@@ -960,11 +961,11 @@ const struct bt_mesh_model_op _bt_mesh_dfu_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int dfu_cli_init(struct bt_mesh_model *mod)
+static int dfu_cli_init(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfu_cli *cli = mod->user_data;
+	struct bt_mesh_dfu_cli *cli = *(mod->user_data);
 
-	if (mod->elem_idx != 0) {
+	if (*(mod->elem_idx) != 0) {
 		LOG_ERR("DFU update client must be instantiated on first elem");
 		return -EINVAL;
 	}
@@ -980,9 +981,9 @@ static int dfu_cli_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void dfu_cli_reset(struct bt_mesh_model *mod)
+static void dfu_cli_reset(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfu_cli *cli = mod->user_data;
+	struct bt_mesh_dfu_cli *cli = *(mod->user_data);
 
 	cli->req.type = REQ_NONE;
 	cli->req.addr = BT_MESH_ADDR_UNASSIGNED;
diff --git a/subsys/bluetooth/mesh/dfu_srv.c b/subsys/bluetooth/mesh/dfu_srv.c
index 462a777b46c..edd61e6da40 100644
--- a/subsys/bluetooth/mesh/dfu_srv.c
+++ b/subsys/bluetooth/mesh/dfu_srv.c
@@ -125,10 +125,10 @@ static void verify(struct bt_mesh_dfu_srv *srv)
 	}
 }
 
-static int handle_info_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_info_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 	uint8_t idx, limit;
 
 	if (srv->update.phase == BT_MESH_DFU_PHASE_APPLYING) {
@@ -187,10 +187,10 @@ static int handle_info_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ct
 	return 0;
 }
 
-static int handle_metadata_check(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_metadata_check(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 	enum bt_mesh_dfu_status status;
 	enum bt_mesh_dfu_effect effect;
 	uint8_t idx;
@@ -239,10 +239,10 @@ static void update_status_rsp(struct bt_mesh_dfu_srv *srv,
 	bt_mesh_model_send(srv->mod, ctx, &buf, send_cb, srv);
 }
 
-static int handle_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 
 	LOG_DBG("");
 
@@ -262,10 +262,10 @@ static inline bool is_active_update(struct bt_mesh_dfu_srv *srv, uint8_t idx,
 		srv->update.meta != meta_checksum);
 }
 
-static int handle_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 	const struct bt_mesh_blob_io *io;
 	uint16_t timeout_base, meta_checksum;
 	enum bt_mesh_dfu_status status;
@@ -371,10 +371,10 @@ rsp:
 	return 0;
 }
 
-static int handle_cancel(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_cancel(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 
 	if (srv->update.idx == UPDATE_IDX_NONE) {
 		goto rsp;
@@ -392,10 +392,10 @@ rsp:
 	return 0;
 }
 
-static int handle_apply(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_apply(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 	static const struct bt_mesh_send_cb send_cb = {
 		.start = apply_rsp_sending,
 		.end = apply_rsp_sent,
@@ -435,9 +435,9 @@ const struct bt_mesh_model_op _bt_mesh_dfu_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int dfu_srv_init(struct bt_mesh_model *mod)
+static int dfu_srv_init(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 
 	srv->mod = mod;
 	srv->update.idx = UPDATE_IDX_NONE;
@@ -455,11 +455,11 @@ static int dfu_srv_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static int dfu_srv_settings_set(struct bt_mesh_model *mod, const char *name,
+static int dfu_srv_settings_set(const struct bt_mesh_model *mod, const char *name,
 				size_t len_rd, settings_read_cb read_cb,
 				void *cb_arg)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 	ssize_t len;
 
 	if (len_rd < sizeof(srv->update)) {
@@ -484,9 +484,9 @@ static int dfu_srv_settings_set(struct bt_mesh_model *mod, const char *name,
 	return 0;
 }
 
-static void dfu_srv_reset(struct bt_mesh_model *mod)
+static void dfu_srv_reset(const struct bt_mesh_model *mod)
 {
-	struct bt_mesh_dfu_srv *srv = mod->user_data;
+	struct bt_mesh_dfu_srv *srv = *(mod->user_data);
 
 	srv->update.phase = BT_MESH_DFU_PHASE_IDLE;
 	erase_state(srv);
diff --git a/subsys/bluetooth/mesh/foundation.h b/subsys/bluetooth/mesh/foundation.h
index 01cbf93c39e..8a9beef642e 100644
--- a/subsys/bluetooth/mesh/foundation.h
+++ b/subsys/bluetooth/mesh/foundation.h
@@ -150,7 +150,7 @@
 
 void bt_mesh_model_reset(void);
 
-void bt_mesh_attention(struct bt_mesh_model *model, uint8_t time);
+void bt_mesh_attention(const struct bt_mesh_model *model, uint8_t time);
 
 #include <zephyr/sys/byteorder.h>
 
diff --git a/subsys/bluetooth/mesh/health_cli.c b/subsys/bluetooth/mesh/health_cli.c
index 924005f4882..d34d869e243 100644
--- a/subsys/bluetooth/mesh/health_cli.c
+++ b/subsys/bluetooth/mesh/health_cli.c
@@ -36,11 +36,11 @@ struct health_fault_param {
 	size_t *fault_count;
 };
 
-static int health_fault_status(struct bt_mesh_model *model,
+static int health_fault_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 	struct health_fault_param *param;
 	uint8_t test_id;
 	uint16_t cid;
@@ -89,11 +89,11 @@ done:
 	return 0;
 }
 
-static int health_current_status(struct bt_mesh_model *model,
+static int health_current_status(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 	uint8_t test_id;
 	uint16_t cid;
 
@@ -117,11 +117,11 @@ struct health_period_param {
 	uint8_t *divisor;
 };
 
-static int health_period_status(struct bt_mesh_model *model,
+static int health_period_status(const struct bt_mesh_model *model,
 				struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 	struct health_period_param *param;
 	uint8_t divisor;
 
@@ -151,11 +151,11 @@ struct health_attention_param {
 	uint8_t *attention;
 };
 
-static int health_attention_status(struct bt_mesh_model *model,
+static int health_attention_status(const struct bt_mesh_model *model,
 				   struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 	struct health_attention_param *param;
 	uint8_t attention;
 
@@ -402,9 +402,9 @@ void bt_mesh_health_cli_timeout_set(int32_t timeout)
 	msg_timeout = timeout;
 }
 
-static int health_cli_init(struct bt_mesh_model *model)
+static int health_cli_init(const struct bt_mesh_model *model)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 
 	LOG_DBG("primary %u", bt_mesh_model_in_primary(model));
 
@@ -423,9 +423,9 @@ static int health_cli_init(struct bt_mesh_model *model)
 	return 0;
 }
 
-static void health_cli_reset(struct bt_mesh_model *model)
+static void health_cli_reset(const struct bt_mesh_model *model)
 {
-	struct bt_mesh_health_cli *cli = model->user_data;
+	struct bt_mesh_health_cli *cli = *(model->user_data);
 
 	net_buf_simple_reset(cli->pub.msg);
 }
diff --git a/subsys/bluetooth/mesh/health_srv.c b/subsys/bluetooth/mesh/health_srv.c
index bfab40b6ef9..4ae55266ebf 100644
--- a/subsys/bluetooth/mesh/health_srv.c
+++ b/subsys/bluetooth/mesh/health_srv.c
@@ -31,11 +31,11 @@ LOG_MODULE_REGISTER(bt_mesh_health_srv);
 /* Health Server context of the primary element */
 struct bt_mesh_health_srv *health_srv;
 
-static void health_get_registered(struct bt_mesh_model *mod,
+static void health_get_registered(const struct bt_mesh_model *mod,
 				  uint16_t company_id,
 				  struct net_buf_simple *msg)
 {
-	struct bt_mesh_health_srv *srv = mod->user_data;
+	struct bt_mesh_health_srv *srv = *(mod->user_data);
 	uint8_t *test_id;
 
 	LOG_DBG("Company ID 0x%04x", company_id);
@@ -64,10 +64,10 @@ static void health_get_registered(struct bt_mesh_model *mod,
 	}
 }
 
-static size_t health_get_current(struct bt_mesh_model *mod,
+static size_t health_get_current(const struct bt_mesh_model *mod,
 				 struct net_buf_simple *msg)
 {
-	struct bt_mesh_health_srv *srv = mod->user_data;
+	struct bt_mesh_health_srv *srv = *(mod->user_data);
 	const struct bt_mesh_comp *comp;
 	uint8_t *test_id, *company_ptr;
 	uint16_t company_id;
@@ -105,7 +105,7 @@ static size_t health_get_current(struct bt_mesh_model *mod,
 	return fault_count;
 }
 
-static int health_fault_get(struct bt_mesh_model *model,
+static int health_fault_get(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -125,11 +125,11 @@ static int health_fault_get(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_fault_clear_unrel(struct bt_mesh_model *model,
+static int health_fault_clear_unrel(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 	uint16_t company_id;
 
 	company_id = net_buf_simple_pull_le16(buf);
@@ -143,12 +143,12 @@ static int health_fault_clear_unrel(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_fault_clear(struct bt_mesh_model *model,
+static int health_fault_clear(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(sdu, BT_MESH_TX_SDU_MAX);
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 	uint16_t company_id;
 
 	company_id = net_buf_simple_pull_le16(buf);
@@ -173,11 +173,11 @@ static int health_fault_clear(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_fault_test_unrel(struct bt_mesh_model *model,
+static int health_fault_test_unrel(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 	uint16_t company_id;
 	uint8_t test_id;
 
@@ -193,12 +193,12 @@ static int health_fault_test_unrel(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_fault_test(struct bt_mesh_model *model,
+static int health_fault_test(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
 	NET_BUF_SIMPLE_DEFINE(sdu, BT_MESH_TX_SDU_MAX);
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 	uint16_t company_id;
 	uint8_t test_id;
 
@@ -228,12 +228,12 @@ static int health_fault_test(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int send_attention_status(struct bt_mesh_model *model,
+static int send_attention_status(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx)
 {
 	/* Needed size: opcode (2 bytes) + msg + MIC */
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_ATTENTION_STATUS, 1);
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 	uint8_t time;
 
 	time = k_ticks_to_ms_floor32(
@@ -251,7 +251,7 @@ static int send_attention_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int attention_get(struct bt_mesh_model *model,
+static int attention_get(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -260,7 +260,7 @@ static int attention_get(struct bt_mesh_model *model,
 	return send_attention_status(model, ctx);
 }
 
-static int attention_set_unrel(struct bt_mesh_model *model,
+static int attention_set_unrel(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -275,7 +275,7 @@ static int attention_set_unrel(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int attention_set(struct bt_mesh_model *model,
+static int attention_set(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -291,7 +291,7 @@ static int attention_set(struct bt_mesh_model *model,
 	return send_attention_status(model, ctx);
 }
 
-static int send_health_period_status(struct bt_mesh_model *model,
+static int send_health_period_status(const struct bt_mesh_model *model,
 				     struct bt_mesh_msg_ctx *ctx)
 {
 	/* Needed size: opcode (2 bytes) + msg + MIC */
@@ -308,7 +308,7 @@ static int send_health_period_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_period_get(struct bt_mesh_model *model,
+static int health_period_get(const struct bt_mesh_model *model,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -317,7 +317,7 @@ static int health_period_get(struct bt_mesh_model *model,
 	return send_health_period_status(model, ctx);
 }
 
-static int health_period_set_unrel(struct bt_mesh_model *model,
+static int health_period_set_unrel(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -336,7 +336,7 @@ static int health_period_set_unrel(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int health_period_set(struct bt_mesh_model *model,
+static int health_period_set(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -367,7 +367,7 @@ const struct bt_mesh_model_op bt_mesh_health_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int health_pub_update(struct bt_mesh_model *mod)
+static int health_pub_update(const struct bt_mesh_model *mod)
 {
 	struct bt_mesh_model_pub *pub = mod->pub;
 	size_t count;
@@ -386,7 +386,7 @@ static int health_pub_update(struct bt_mesh_model *mod)
 
 int bt_mesh_health_srv_fault_update(struct bt_mesh_elem *elem)
 {
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	mod = bt_mesh_model_find(elem, BT_MESH_MODEL_ID_HEALTH_SRV);
 	if (!mod) {
@@ -418,9 +418,9 @@ static void attention_off(struct k_work *work)
 	}
 }
 
-static int health_srv_init(struct bt_mesh_model *model)
+static int health_srv_init(const struct bt_mesh_model *model)
 {
-	struct bt_mesh_health_srv *srv = model->user_data;
+	struct bt_mesh_health_srv *srv = *(model->user_data);
 
 	if (!srv) {
 		LOG_ERR("No Health Server context provided");
@@ -449,7 +449,7 @@ const struct bt_mesh_model_cb bt_mesh_health_srv_cb = {
 	.init = health_srv_init,
 };
 
-void bt_mesh_attention(struct bt_mesh_model *model, uint8_t time)
+void bt_mesh_attention(const struct bt_mesh_model *model, uint8_t time)
 {
 	struct bt_mesh_health_srv *srv;
 
@@ -462,7 +462,7 @@ void bt_mesh_attention(struct bt_mesh_model *model, uint8_t time)
 
 		model = srv->model;
 	} else {
-		srv = model->user_data;
+		srv = *(model->user_data);
 	}
 
 	if ((time > 0) && srv->cb && srv->cb->attn_on) {
diff --git a/subsys/bluetooth/mesh/large_comp_data_cli.c b/subsys/bluetooth/mesh/large_comp_data_cli.c
index 614569d54ae..dc1152f415f 100644
--- a/subsys/bluetooth/mesh/large_comp_data_cli.c
+++ b/subsys/bluetooth/mesh/large_comp_data_cli.c
@@ -33,7 +33,7 @@ LOG_MODULE_REGISTER(bt_mesh_large_comp_data_cli);
 static struct bt_mesh_large_comp_data_cli *cli;
 static int32_t msg_timeout;
 
-static int data_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int data_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf, uint32_t op,
 		       void (*cb)(struct bt_mesh_large_comp_data_cli *cli, uint16_t addr,
 				  struct bt_mesh_large_comp_data_rsp *rsp))
@@ -78,7 +78,7 @@ static int data_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int large_comp_data_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int large_comp_data_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
 	return data_status(model, ctx, buf, OP_LARGE_COMP_DATA_STATUS,
@@ -86,7 +86,7 @@ static int large_comp_data_status(struct bt_mesh_model *model, struct bt_mesh_ms
 			    cli->cb->large_comp_data_status : NULL));
 }
 
-static int models_metadata_status(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int models_metadata_status(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
 	return data_status(model, ctx, buf, OP_MODELS_METADATA_STATUS,
@@ -100,7 +100,7 @@ const struct bt_mesh_model_op _bt_mesh_large_comp_data_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int large_comp_data_cli_init(struct bt_mesh_model *model)
+static int large_comp_data_cli_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Large Comp Data Client only allowed in primary element");
@@ -108,9 +108,9 @@ static int large_comp_data_cli_init(struct bt_mesh_model *model)
 	}
 
 	model->keys[0] = BT_MESH_KEY_DEV_ANY;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
-	cli = model->user_data;
+	cli = *(model->user_data);
 	cli->model = model;
 
 	msg_timeout = 5000;
diff --git a/subsys/bluetooth/mesh/large_comp_data_srv.c b/subsys/bluetooth/mesh/large_comp_data_srv.c
index 4ee591d9efd..5d724b9f083 100644
--- a/subsys/bluetooth/mesh/large_comp_data_srv.c
+++ b/subsys/bluetooth/mesh/large_comp_data_srv.c
@@ -37,10 +37,11 @@ LOG_MODULE_REGISTER(bt_mesh_large_comp_data_srv);
 /** Mesh Large Composition Data Server Model Context */
 static struct bt_mesh_large_comp_data_srv {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 } srv;
 
-static int handle_large_comp_data_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int handle_large_comp_data_get(const struct bt_mesh_model *model,
+				      struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(rsp, OP_LARGE_COMP_DATA_STATUS,
@@ -101,7 +102,8 @@ static int handle_large_comp_data_get(struct bt_mesh_model *model, struct bt_mes
 	return 0;
 }
 
-static int handle_models_metadata_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int handle_models_metadata_get(const struct bt_mesh_model *model,
+				      struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(rsp, OP_MODELS_METADATA_STATUS,
@@ -166,7 +168,7 @@ const struct bt_mesh_model_op _bt_mesh_large_comp_data_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int large_comp_data_srv_init(struct bt_mesh_model *model)
+static int large_comp_data_srv_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Large Composition Data Server only allowed in primary element");
@@ -175,7 +177,7 @@ static int large_comp_data_srv_init(struct bt_mesh_model *model)
 
 	/* Large Composition Data Server model shall use the device key */
 	model->keys[0] = BT_MESH_KEY_DEV;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	srv.model = model;
 
diff --git a/subsys/bluetooth/mesh/main.c b/subsys/bluetooth/mesh/main.c
index fb70eef669a..3aedf19af48 100644
--- a/subsys/bluetooth/mesh/main.c
+++ b/subsys/bluetooth/mesh/main.c
@@ -419,7 +419,7 @@ bool bt_mesh_is_provisioned(void)
 	return atomic_test_bit(bt_mesh.flags, BT_MESH_VALID);
 }
 
-static void model_suspend(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void model_suspend(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 			  bool vnd, bool primary, void *user_data)
 {
 	if (mod->pub && mod->pub->update) {
@@ -463,7 +463,7 @@ int bt_mesh_suspend(void)
 	return 0;
 }
 
-static void model_resume(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void model_resume(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 			  bool vnd, bool primary, void *user_data)
 {
 	if (mod->pub && mod->pub->update) {
@@ -552,7 +552,7 @@ int bt_mesh_init(const struct bt_mesh_prov *prov,
 	return 0;
 }
 
-static void model_start(struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
+static void model_start(const struct bt_mesh_model *mod, struct bt_mesh_elem *elem,
 			bool vnd, bool primary, void *user_data)
 {
 	if (mod->cb && mod->cb->start) {
diff --git a/subsys/bluetooth/mesh/msg.c b/subsys/bluetooth/mesh/msg.c
index 458b387539f..6ba497be0c0 100644
--- a/subsys/bluetooth/mesh/msg.c
+++ b/subsys/bluetooth/mesh/msg.c
@@ -87,7 +87,7 @@ bool bt_mesh_msg_ack_ctx_match(const struct bt_mesh_msg_ack_ctx *ack,
 	return true;
 }
 
-int bt_mesh_msg_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+int bt_mesh_msg_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		     struct net_buf_simple *buf)
 {
 	if (!ctx && !model->pub) {
@@ -104,7 +104,7 @@ int bt_mesh_msg_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return bt_mesh_model_publish(model);
 }
 
-int bt_mesh_msg_ackd_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+int bt_mesh_msg_ackd_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf, const struct bt_mesh_msg_rsp_ctx *rsp)
 {
 	int err;
diff --git a/subsys/bluetooth/mesh/msg.h b/subsys/bluetooth/mesh/msg.h
index a5d75949130..ff52260b626 100644
--- a/subsys/bluetooth/mesh/msg.h
+++ b/subsys/bluetooth/mesh/msg.h
@@ -18,7 +18,7 @@
  * @retval -EADDRNOTAVAIL A message context was not provided and publishing is not configured.
  * @retval -EAGAIN The device has not been provisioned.
  */
-int bt_mesh_msg_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+int bt_mesh_msg_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		     struct net_buf_simple *buf);
 
 /**
@@ -51,5 +51,5 @@ struct bt_mesh_msg_rsp_ctx {
  * @retval -EAGAIN The device has not been provisioned.
  * @retval -ETIMEDOUT The request timed out without a response.
  */
-int bt_mesh_msg_ackd_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+int bt_mesh_msg_ackd_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf, const struct bt_mesh_msg_rsp_ctx *rsp);
diff --git a/subsys/bluetooth/mesh/od_priv_proxy_cli.c b/subsys/bluetooth/mesh/od_priv_proxy_cli.c
index 67f5ac961ad..f2844d2ecc6 100644
--- a/subsys/bluetooth/mesh/od_priv_proxy_cli.c
+++ b/subsys/bluetooth/mesh/od_priv_proxy_cli.c
@@ -20,7 +20,7 @@ static struct bt_mesh_od_priv_proxy_cli *cli;
 
 static int32_t msg_timeout;
 
-static int handle_proxy_status(struct bt_mesh_model *mod,
+static int handle_proxy_status(const struct bt_mesh_model *mod,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -93,17 +93,17 @@ void bt_mesh_od_priv_proxy_cli_timeout_set(int32_t timeout)
 	msg_timeout = timeout;
 }
 
-static int on_demand_proxy_cli_init(struct bt_mesh_model *mod)
+static int on_demand_proxy_cli_init(const struct bt_mesh_model *mod)
 {
 	if (!bt_mesh_model_in_primary(mod)) {
 		LOG_ERR("On-Demand Private Proxy client not in primary element");
 		return -EINVAL;
 	}
 
-	cli = mod->user_data;
+	cli = *(mod->user_data);
 	cli->model = mod;
 	mod->keys[0] = BT_MESH_KEY_DEV_ANY;
-	mod->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(mod->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 	msg_timeout = CONFIG_BT_MESH_OD_PRIV_PROXY_CLI_TIMEOUT;
 
 	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);
diff --git a/subsys/bluetooth/mesh/od_priv_proxy_srv.c b/subsys/bluetooth/mesh/od_priv_proxy_srv.c
index b18a8ec7530..e671a80e9de 100644
--- a/subsys/bluetooth/mesh/od_priv_proxy_srv.c
+++ b/subsys/bluetooth/mesh/od_priv_proxy_srv.c
@@ -16,7 +16,7 @@
 LOG_MODULE_REGISTER(bt_mesh_od_priv_proxy_srv);
 
 
-static struct bt_mesh_model *od_priv_proxy_srv;
+static const struct bt_mesh_model *od_priv_proxy_srv;
 static uint8_t on_demand_state;
 
 static int od_priv_proxy_store(bool delete)
@@ -31,7 +31,7 @@ static int od_priv_proxy_store(bool delete)
 	return bt_mesh_model_data_store(od_priv_proxy_srv, false, "pp", data, len);
 }
 
-static int proxy_status_rsp(struct bt_mesh_model *mod,
+static int proxy_status_rsp(const struct bt_mesh_model *mod,
 			    struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(buf, OP_OD_PRIV_PROXY_STATUS, 1);
@@ -44,7 +44,7 @@ static int proxy_status_rsp(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_proxy_get(struct bt_mesh_model *mod,
+static int handle_proxy_get(const struct bt_mesh_model *mod,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -55,7 +55,7 @@ static int handle_proxy_get(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_proxy_set(struct bt_mesh_model *mod,
+static int handle_proxy_set(const struct bt_mesh_model *mod,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -79,13 +79,13 @@ const struct bt_mesh_model_op _bt_mesh_od_priv_proxy_srv_op[] = {
 	BT_MESH_MODEL_OP_END
 };
 
-static int od_priv_proxy_srv_init(struct bt_mesh_model *mod)
+static int od_priv_proxy_srv_init(const struct bt_mesh_model *mod)
 {
 	od_priv_proxy_srv = mod;
 
-	struct bt_mesh_model *priv_beacon_srv = bt_mesh_model_find(
+	const struct bt_mesh_model *priv_beacon_srv = bt_mesh_model_find(
 		bt_mesh_model_elem(mod), BT_MESH_MODEL_ID_PRIV_BEACON_SRV);
-	struct bt_mesh_model *sol_pdu_rpl_srv = bt_mesh_model_find(
+	const struct bt_mesh_model *sol_pdu_rpl_srv = bt_mesh_model_find(
 		bt_mesh_model_elem(mod), BT_MESH_MODEL_ID_SOL_PDU_RPL_SRV);
 
 	if (priv_beacon_srv == NULL) {
@@ -98,7 +98,7 @@ static int od_priv_proxy_srv_init(struct bt_mesh_model *mod)
 	}
 
 	mod->keys[0] = BT_MESH_KEY_DEV_LOCAL;
-	mod->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(mod->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	if (IS_ENABLED(CONFIG_BT_MESH_MODEL_EXTENSIONS)) {
 		bt_mesh_model_extend(mod, priv_beacon_srv);
@@ -108,14 +108,14 @@ static int od_priv_proxy_srv_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void od_priv_proxy_srv_reset(struct bt_mesh_model *model)
+static void od_priv_proxy_srv_reset(const struct bt_mesh_model *model)
 {
 	on_demand_state = 0;
 	od_priv_proxy_store(true);
 }
 
 #ifdef CONFIG_BT_SETTINGS
-static int od_priv_proxy_srv_settings_set(struct bt_mesh_model *model, const char *name,
+static int od_priv_proxy_srv_settings_set(const struct bt_mesh_model *model, const char *name,
 					  size_t len_rd, settings_read_cb read_cb, void *cb_data)
 {
 	int err;
@@ -135,7 +135,7 @@ static int od_priv_proxy_srv_settings_set(struct bt_mesh_model *model, const cha
 	return 0;
 }
 
-static void od_priv_proxy_srv_pending_store(struct bt_mesh_model *model)
+static void od_priv_proxy_srv_pending_store(const struct bt_mesh_model *model)
 {
 	on_demand_state = bt_mesh_od_priv_proxy_get();
 	od_priv_proxy_store(false);
diff --git a/subsys/bluetooth/mesh/op_agg.h b/subsys/bluetooth/mesh/op_agg.h
index 8bb3d6c97ba..a56a30ccd31 100644
--- a/subsys/bluetooth/mesh/op_agg.h
+++ b/subsys/bluetooth/mesh/op_agg.h
@@ -19,8 +19,8 @@ struct op_agg_ctx {
 
 int bt_mesh_op_agg_encode_msg(struct net_buf_simple *msg, struct net_buf_simple *buf);
 int bt_mesh_op_agg_decode_msg(struct net_buf_simple *msg, struct net_buf_simple *buf);
-int bt_mesh_op_agg_cli_send(struct bt_mesh_model *model, struct net_buf_simple *msg);
+int bt_mesh_op_agg_cli_send(const struct bt_mesh_model *model, struct net_buf_simple *msg);
 int bt_mesh_op_agg_cli_accept(struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf);
-int bt_mesh_op_agg_srv_send(struct bt_mesh_model *model, struct net_buf_simple *msg);
+int bt_mesh_op_agg_srv_send(const struct bt_mesh_model *model, struct net_buf_simple *msg);
 int bt_mesh_op_agg_srv_accept(struct bt_mesh_msg_ctx *ctx, struct net_buf_simple *buf);
 bool bt_mesh_op_agg_is_op_agg_msg(struct net_buf_simple *buf);
diff --git a/subsys/bluetooth/mesh/op_agg_cli.c b/subsys/bluetooth/mesh/op_agg_cli.c
index 612843a98cc..b74b8245cfd 100644
--- a/subsys/bluetooth/mesh/op_agg_cli.c
+++ b/subsys/bluetooth/mesh/op_agg_cli.c
@@ -24,7 +24,7 @@ NET_BUF_SIMPLE_DEFINE_STATIC(sdu, BT_MESH_TX_SDU_MAX);
 /** Mesh Opcodes Aggregator Client Model Context */
 static struct bt_mesh_op_agg_cli {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 	/** Acknowledge context. */
 	struct bt_mesh_msg_ack_ctx ack_ctx;
 	/** List of source element addresses.
@@ -39,7 +39,7 @@ static struct bt_mesh_op_agg_cli {
 
 static int32_t msg_timeout;
 
-static int handle_status(struct bt_mesh_model *model,
+static int handle_status(const struct bt_mesh_model *model,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -102,7 +102,7 @@ const struct bt_mesh_model_op _bt_mesh_op_agg_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int op_agg_cli_init(struct bt_mesh_model *model)
+static int op_agg_cli_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Opcodes Aggregator Client only allowed in primary element");
@@ -203,7 +203,7 @@ void bt_mesh_op_agg_cli_timeout_set(int32_t timeout)
 	msg_timeout = timeout;
 }
 
-int bt_mesh_op_agg_cli_send(struct bt_mesh_model *model, struct net_buf_simple *msg)
+int bt_mesh_op_agg_cli_send(const struct bt_mesh_model *model, struct net_buf_simple *msg)
 {
 	uint16_t src = bt_mesh_model_elem(model)->addr;
 
diff --git a/subsys/bluetooth/mesh/op_agg_srv.c b/subsys/bluetooth/mesh/op_agg_srv.c
index a6e5f666411..9bbe01384e2 100644
--- a/subsys/bluetooth/mesh/op_agg_srv.c
+++ b/subsys/bluetooth/mesh/op_agg_srv.c
@@ -22,7 +22,7 @@ NET_BUF_SIMPLE_DEFINE_STATIC(sdu, BT_MESH_TX_SDU_MAX);
 /** Mesh Opcodes Aggragator Server Model Context */
 static struct bt_mesh_op_agg_srv {
 	/** Composition data model entry pointer. */
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 	/** Response error code. */
 	int rsp_err;
 	/** Indicates that the received aggregated message
@@ -33,7 +33,7 @@ static struct bt_mesh_op_agg_srv {
 	struct op_agg_ctx ctx;
 } srv = {.ctx.sdu = &sdu};
 
-static int handle_sequence(struct bt_mesh_model *model,
+static int handle_sequence(const struct bt_mesh_model *model,
 			   struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
@@ -114,7 +114,7 @@ const struct bt_mesh_model_op _bt_mesh_op_agg_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int op_agg_srv_init(struct bt_mesh_model *model)
+static int op_agg_srv_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Opcodes Aggregator Server only allowed in primary element");
@@ -131,7 +131,7 @@ static int op_agg_srv_init(struct bt_mesh_model *model)
 	return 0;
 }
 
-int bt_mesh_op_agg_srv_send(struct bt_mesh_model *model, struct net_buf_simple *msg)
+int bt_mesh_op_agg_srv_send(const struct bt_mesh_model *model, struct net_buf_simple *msg)
 {
 	int err;
 
diff --git a/subsys/bluetooth/mesh/priv_beacon_cli.c b/subsys/bluetooth/mesh/priv_beacon_cli.c
index d14454c7cf5..fd48ef0583b 100644
--- a/subsys/bluetooth/mesh/priv_beacon_cli.c
+++ b/subsys/bluetooth/mesh/priv_beacon_cli.c
@@ -18,7 +18,7 @@ static struct bt_mesh_priv_beacon_cli *cli;
 
 static int32_t msg_timeout;
 
-static int handle_beacon_status(struct bt_mesh_model *model,
+static int handle_beacon_status(const struct bt_mesh_model *model,
 				struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
@@ -56,7 +56,7 @@ static int handle_beacon_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int handle_gatt_proxy_status(struct bt_mesh_model *model,
+static int handle_gatt_proxy_status(const struct bt_mesh_model *model,
 				    struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
@@ -86,7 +86,7 @@ static int handle_gatt_proxy_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int handle_node_id_status(struct bt_mesh_model *model,
+static int handle_node_id_status(const struct bt_mesh_model *model,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -134,18 +134,18 @@ const struct bt_mesh_model_op bt_mesh_priv_beacon_cli_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int priv_beacon_cli_init(struct bt_mesh_model *model)
+static int priv_beacon_cli_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Private Beacon Client only allowed in primary element");
 		return -EINVAL;
 	}
 
-	cli = model->user_data;
+	cli = *(model->user_data);
 	cli->model = model;
 	msg_timeout = 2 * MSEC_PER_SEC;
 	model->keys[0] = BT_MESH_KEY_DEV_ANY;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);
 
diff --git a/subsys/bluetooth/mesh/priv_beacon_srv.c b/subsys/bluetooth/mesh/priv_beacon_srv.c
index 377703e8352..5b5e62f1736 100644
--- a/subsys/bluetooth/mesh/priv_beacon_srv.c
+++ b/subsys/bluetooth/mesh/priv_beacon_srv.c
@@ -17,7 +17,7 @@
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(bt_mesh_priv_beacon_srv);
 
-static struct bt_mesh_model *priv_beacon_srv;
+static const struct bt_mesh_model *priv_beacon_srv;
 
 /* Private Beacon configuration server model states */
 struct {
@@ -38,7 +38,7 @@ static int priv_beacon_store(bool delete)
 	return bt_mesh_model_data_store(priv_beacon_srv, false, "pb", data, len);
 }
 
-static int beacon_status_rsp(struct bt_mesh_model *mod,
+static int beacon_status_rsp(const struct bt_mesh_model *mod,
 			      struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(buf, OP_PRIV_BEACON_STATUS, 2);
@@ -52,7 +52,7 @@ static int beacon_status_rsp(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_beacon_get(struct bt_mesh_model *mod,
+static int handle_beacon_get(const struct bt_mesh_model *mod,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -63,7 +63,7 @@ static int handle_beacon_get(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_beacon_set(struct bt_mesh_model *mod,
+static int handle_beacon_set(const struct bt_mesh_model *mod,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -90,7 +90,7 @@ static int handle_beacon_set(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static void gatt_proxy_status_rsp(struct bt_mesh_model *mod,
+static void gatt_proxy_status_rsp(const struct bt_mesh_model *mod,
 				  struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(buf, OP_PRIV_GATT_PROXY_STATUS, 1);
@@ -101,7 +101,7 @@ static void gatt_proxy_status_rsp(struct bt_mesh_model *mod,
 	bt_mesh_model_send(mod, ctx, &buf, NULL, NULL);
 }
 
-static int handle_gatt_proxy_get(struct bt_mesh_model *mod,
+static int handle_gatt_proxy_get(const struct bt_mesh_model *mod,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -112,7 +112,7 @@ static int handle_gatt_proxy_get(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_gatt_proxy_set(struct bt_mesh_model *mod,
+static int handle_gatt_proxy_set(const struct bt_mesh_model *mod,
 				 struct bt_mesh_msg_ctx *ctx,
 				 struct net_buf_simple *buf)
 {
@@ -134,7 +134,7 @@ static int handle_gatt_proxy_set(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static void node_id_status_rsp(struct bt_mesh_model *mod,
+static void node_id_status_rsp(const struct bt_mesh_model *mod,
 			       struct bt_mesh_msg_ctx *ctx, uint8_t status,
 			       uint16_t net_idx, uint8_t node_id)
 {
@@ -148,7 +148,7 @@ static void node_id_status_rsp(struct bt_mesh_model *mod,
 	bt_mesh_model_send(mod, ctx, &buf, NULL, NULL);
 }
 
-static int handle_node_id_get(struct bt_mesh_model *mod,
+static int handle_node_id_get(const struct bt_mesh_model *mod,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -163,7 +163,7 @@ static int handle_node_id_get(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_node_id_set(struct bt_mesh_model *mod,
+static int handle_node_id_set(const struct bt_mesh_model *mod,
 			      struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
@@ -194,7 +194,7 @@ const struct bt_mesh_model_op bt_mesh_priv_beacon_srv_op[] = {
 	BT_MESH_MODEL_OP_END
 };
 
-static int priv_beacon_srv_init(struct bt_mesh_model *mod)
+static int priv_beacon_srv_init(const struct bt_mesh_model *mod)
 {
 	if (!bt_mesh_model_in_primary(mod)) {
 		LOG_ERR("Priv beacon server not in primary element");
@@ -207,14 +207,14 @@ static int priv_beacon_srv_init(struct bt_mesh_model *mod)
 	return 0;
 }
 
-static void priv_beacon_srv_reset(struct bt_mesh_model *model)
+static void priv_beacon_srv_reset(const struct bt_mesh_model *model)
 {
 	(void)memset(&priv_beacon_state, 0, sizeof(priv_beacon_state));
 	priv_beacon_store(true);
 }
 
 #ifdef CONFIG_BT_SETTINGS
-static int priv_beacon_srv_settings_set(struct bt_mesh_model *model, const char *name,
+static int priv_beacon_srv_settings_set(const struct bt_mesh_model *model, const char *name,
 					size_t len_rd, settings_read_cb read_cb, void *cb_data)
 {
 	int err;
@@ -236,7 +236,7 @@ static int priv_beacon_srv_settings_set(struct bt_mesh_model *model, const char
 	return 0;
 }
 
-static void priv_beacon_srv_pending_store(struct bt_mesh_model *model)
+static void priv_beacon_srv_pending_store(const struct bt_mesh_model *model)
 {
 	priv_beacon_state.state = bt_mesh_priv_beacon_get();
 	priv_beacon_state.interval = bt_mesh_priv_beacon_update_interval_get();
diff --git a/subsys/bluetooth/mesh/rpr_cli.c b/subsys/bluetooth/mesh/rpr_cli.c
index 3ebd3afcd6a..7a1dd493b87 100644
--- a/subsys/bluetooth/mesh/rpr_cli.c
+++ b/subsys/bluetooth/mesh/rpr_cli.c
@@ -90,11 +90,11 @@ static void tx_complete(struct bt_mesh_rpr_cli *cli, int err, void *cb_data)
 	}
 }
 
-static int handle_extended_scan_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_extended_scan_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				       struct net_buf_simple *buf)
 {
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_unprov dev = { 0 };
 	enum bt_mesh_rpr_status status;
 	bool found_dev = false;
@@ -123,11 +123,11 @@ static int handle_extended_scan_report(struct bt_mesh_model *mod, struct bt_mesh
 	return 0;
 }
 
-static int handle_link_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_link_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_link link;
 	uint8_t reason = PROV_BEARER_LINK_STATUS_SUCCESS;
 
@@ -161,10 +161,10 @@ static int handle_link_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_link_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_link_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 	struct bt_mesh_rpr_link *rsp;
 	struct bt_mesh_rpr_link link;
@@ -195,10 +195,10 @@ static int handle_link_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_pdu_outbound_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_pdu_outbound_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 	void *cb_data;
 	uint8_t num;
@@ -226,10 +226,10 @@ static int handle_pdu_outbound_report(struct bt_mesh_model *mod, struct bt_mesh_
 	return 0;
 }
 
-static int handle_pdu_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_pdu_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 	struct pb_remote_ctx cb_ctx = {
 		cli,
@@ -257,10 +257,10 @@ static int handle_pdu_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *
 	return 0;
 }
 
-static int handle_scan_caps_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_caps_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				   struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 	struct bt_mesh_rpr_caps *caps;
 
@@ -281,10 +281,10 @@ static int handle_scan_caps_status(struct bt_mesh_model *mod, struct bt_mesh_msg
 	return 0;
 }
 
-static int handle_scan_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_report(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 	struct bt_mesh_rpr_unprov dev = { 0 };
 
@@ -313,10 +313,10 @@ static int handle_scan_report(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx
 	return 0;
 }
 
-static int handle_scan_status(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_status(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			      struct net_buf_simple *buf)
 {
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 	struct bt_mesh_rpr_scan_status *status;
 	struct bt_mesh_rpr_node srv = RPR_NODE(ctx);
 
@@ -361,15 +361,15 @@ static void link_timeout(struct k_work *work)
 	}
 }
 
-static int rpr_cli_init(struct bt_mesh_model *mod)
+static int rpr_cli_init(const struct bt_mesh_model *mod)
 {
-	if (mod->elem_idx) {
+	if (*(mod->elem_idx)) {
 		LOG_ERR("Remote provisioning client must be initialized "
 			"on first element");
 		return -EINVAL;
 	}
 
-	struct bt_mesh_rpr_cli *cli = mod->user_data;
+	struct bt_mesh_rpr_cli *cli = *(mod->user_data);
 
 	cli->mod = mod;
 	cli->link.time = LINK_TIMEOUT_SECONDS_DEFAULT;
@@ -378,7 +378,7 @@ static int rpr_cli_init(struct bt_mesh_model *mod)
 	bt_mesh_msg_ack_ctx_init(&cli->prov_ack_ctx);
 	k_work_init_delayable(&cli->link.timeout, link_timeout);
 	mod->keys[0] = BT_MESH_KEY_DEV_ANY;
-	mod->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(mod->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	return 0;
 }
diff --git a/subsys/bluetooth/mesh/rpr_srv.c b/subsys/bluetooth/mesh/rpr_srv.c
index fb2b57fad2e..e008aa0a8b1 100644
--- a/subsys/bluetooth/mesh/rpr_srv.c
+++ b/subsys/bluetooth/mesh/rpr_srv.c
@@ -47,7 +47,7 @@ enum {
 
 /** Remote provisioning server instance. */
 static struct {
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	ATOMIC_DEFINE(flags, RPR_SRV_NUM_FLAGS);
 
@@ -536,7 +536,7 @@ static const struct prov_bearer_cb prov_bearer_cb = {
  * Message handlers
  ******************************************************************************/
 
-static int handle_scan_caps_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_caps_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(rsp, RPR_OP_SCAN_CAPS_STATUS, 2);
@@ -549,7 +549,7 @@ static int handle_scan_caps_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ct
 	return 0;
 }
 
-static int handle_scan_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	scan_status_send(ctx, BT_MESH_RPR_SUCCESS);
@@ -557,7 +557,7 @@ static int handle_scan_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ct
 	return 0;
 }
 
-static int handle_scan_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
 	struct bt_mesh_rpr_node cli = RPR_NODE(ctx);
@@ -621,7 +621,7 @@ rsp:
 	return 0;
 }
 
-static int handle_extended_scan_start(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_extended_scan_start(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 				      struct net_buf_simple *buf)
 {
 	BT_MESH_MODEL_BUF_DEFINE(rsp, RPR_OP_EXTENDED_SCAN_REPORT,
@@ -784,7 +784,7 @@ rsp:
 	return 0;
 }
 
-static int handle_scan_stop(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_scan_stop(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
 	if (atomic_test_bit(srv.flags, SCANNING)) {
@@ -797,7 +797,7 @@ static int handle_scan_stop(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *c
 	return 0;
 }
 
-static int handle_link_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_link_get(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	LOG_DBG("");
@@ -807,7 +807,7 @@ static int handle_link_get(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ct
 	return 0;
 }
 
-static int handle_link_open(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_link_open(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
 	bool is_refresh_procedure = (buf->len == 1);
@@ -938,7 +938,7 @@ rsp:
 	return 0;
 }
 
-static int handle_link_close(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_link_close(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
 	struct bt_mesh_rpr_node cli = RPR_NODE(ctx);
@@ -975,7 +975,7 @@ static int handle_link_close(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *
 	return 0;
 }
 
-static int handle_pdu_send(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int handle_pdu_send(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	struct bt_mesh_rpr_node cli = RPR_NODE(ctx);
@@ -1303,9 +1303,9 @@ static struct bt_le_scan_cb scan_cb = {
 	.recv = scan_packet_recv,
 };
 
-static int rpr_srv_init(struct bt_mesh_model *mod)
+static int rpr_srv_init(const struct bt_mesh_model *mod)
 {
-	if (mod->elem_idx || srv.mod) {
+	if (*(mod->elem_idx) || srv.mod) {
 		LOG_ERR("Remote provisioning server must be initialized "
 			"on first element");
 		return -EINVAL;
@@ -1320,12 +1320,12 @@ static int rpr_srv_init(struct bt_mesh_model *mod)
 	k_work_init(&srv.link.report, link_report_send_and_clear);
 	bt_le_scan_cb_register(&scan_cb);
 	mod->keys[0] = BT_MESH_KEY_DEV_LOCAL;
-	mod->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(mod->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	return 0;
 }
 
-static void rpr_srv_reset(struct bt_mesh_model *mod)
+static void rpr_srv_reset(const struct bt_mesh_model *mod)
 {
 	cli_link_clear();
 	cli_scan_clear();
diff --git a/subsys/bluetooth/mesh/sar_cfg_cli.c b/subsys/bluetooth/mesh/sar_cfg_cli.c
index b5a33b975e5..aaf07451e1d 100644
--- a/subsys/bluetooth/mesh/sar_cfg_cli.c
+++ b/subsys/bluetooth/mesh/sar_cfg_cli.c
@@ -21,7 +21,7 @@ LOG_MODULE_REGISTER(bt_mesh_sar_cfg_cli);
 
 static struct bt_mesh_sar_cfg_cli *cli;
 
-static int transmitter_status(struct bt_mesh_model *model,
+static int transmitter_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
@@ -45,7 +45,7 @@ static int transmitter_status(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int receiver_status(struct bt_mesh_model *model,
+static int receiver_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
@@ -87,35 +87,35 @@ void bt_mesh_sar_cfg_cli_timeout_set(int32_t timeout)
 	cli->timeout = timeout;
 }
 
-static int bt_mesh_sar_cfg_cli_init(struct bt_mesh_model *model)
+static int bt_mesh_sar_cfg_cli_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("SAR Configuration Client only allowed in primary element");
 		return -EINVAL;
 	}
 
-	if (!model->user_data) {
+	if (!*(model->user_data)) {
 		LOG_ERR("No SAR Configuration Client context provided");
 		return -EINVAL;
 	}
 
-	cli = model->user_data;
+	cli = *(model->user_data);
 	cli->model = model;
 	cli->timeout = 2 * MSEC_PER_SEC;
 
 	model->keys[0] = BT_MESH_KEY_DEV_ANY;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);
 
 	return 0;
 }
 
-static void bt_mesh_sar_cfg_cli_reset(struct bt_mesh_model *model)
+static void bt_mesh_sar_cfg_cli_reset(const struct bt_mesh_model *model)
 {
 	struct bt_mesh_sar_cfg_cli *model_cli;
 
-	model_cli = model->user_data;
+	model_cli = *(model->user_data);
 
 	bt_mesh_msg_ack_ctx_clear(&model_cli->ack_ctx);
 }
diff --git a/subsys/bluetooth/mesh/sar_cfg_srv.c b/subsys/bluetooth/mesh/sar_cfg_srv.c
index e05489ee0cf..59ec36907c5 100644
--- a/subsys/bluetooth/mesh/sar_cfg_srv.c
+++ b/subsys/bluetooth/mesh/sar_cfg_srv.c
@@ -27,7 +27,7 @@
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(bt_mesh_sar_cfg_srv);
 
-static int sar_rx_store(struct bt_mesh_model *model, bool delete)
+static int sar_rx_store(const struct bt_mesh_model *model, bool delete)
 {
 	const void *data = delete ? NULL : &bt_mesh.sar_rx;
 	size_t len = delete ? 0 : sizeof(struct bt_mesh_sar_rx);
@@ -35,7 +35,7 @@ static int sar_rx_store(struct bt_mesh_model *model, bool delete)
 	return bt_mesh_model_data_store(model, false, "sar_rx", data, len);
 }
 
-static int sar_tx_store(struct bt_mesh_model *model, bool delete)
+static int sar_tx_store(const struct bt_mesh_model *model, bool delete)
 {
 	const void *data = delete ? NULL : &bt_mesh.sar_tx;
 	size_t len = delete ? 0 : sizeof(struct bt_mesh_sar_tx);
@@ -43,7 +43,7 @@ static int sar_tx_store(struct bt_mesh_model *model, bool delete)
 	return bt_mesh_model_data_store(model, false, "sar_tx", data, len);
 }
 
-static void transmitter_status(struct bt_mesh_model *model,
+static void transmitter_status(const struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_SAR_CFG_TX_STATUS, BT_MESH_SAR_TX_LEN);
@@ -63,7 +63,7 @@ static void transmitter_status(struct bt_mesh_model *model,
 	}
 }
 
-static void receiver_status(struct bt_mesh_model *model,
+static void receiver_status(const struct bt_mesh_model *model,
 			    struct bt_mesh_msg_ctx *ctx)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, OP_SAR_CFG_RX_STATUS, BT_MESH_SAR_RX_LEN);
@@ -81,7 +81,7 @@ static void receiver_status(struct bt_mesh_model *model,
 	}
 }
 
-static int transmitter_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int transmitter_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	LOG_DBG("src 0x%04x", ctx->addr);
@@ -91,7 +91,7 @@ static int transmitter_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *
 	return 0;
 }
 
-static int transmitter_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int transmitter_set(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			   struct net_buf_simple *buf)
 {
 	struct bt_mesh_sar_tx *tx = &bt_mesh.sar_tx;
@@ -108,7 +108,7 @@ static int transmitter_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *
 	return 0;
 }
 
-static int receiver_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int receiver_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
 	LOG_DBG("src 0x%04x", ctx->addr);
@@ -118,7 +118,7 @@ static int receiver_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx
 	return 0;
 }
 
-static int receiver_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int receiver_set(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
 	struct bt_mesh_sar_rx *rx = &bt_mesh.sar_rx;
@@ -143,7 +143,7 @@ const struct bt_mesh_model_op bt_mesh_sar_cfg_srv_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static int sar_cfg_srv_init(struct bt_mesh_model *model)
+static int sar_cfg_srv_init(const struct bt_mesh_model *model)
 {
 	if (!bt_mesh_model_in_primary(model)) {
 		LOG_ERR("Configuration Server only allowed in primary element");
@@ -155,12 +155,12 @@ static int sar_cfg_srv_init(struct bt_mesh_model *model)
 	 * device-key is allowed to access this model.
 	 */
 	model->keys[0] = BT_MESH_KEY_DEV_LOCAL;
-	model->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(model->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	return 0;
 }
 
-static void sar_cfg_srv_reset(struct bt_mesh_model *model)
+static void sar_cfg_srv_reset(const struct bt_mesh_model *model)
 {
 	struct bt_mesh_sar_tx sar_tx = BT_MESH_SAR_TX_INIT;
 	struct bt_mesh_sar_rx sar_rx = BT_MESH_SAR_RX_INIT;
@@ -175,8 +175,9 @@ static void sar_cfg_srv_reset(struct bt_mesh_model *model)
 }
 
 #ifdef CONFIG_BT_SETTINGS
-static int sar_cfg_srv_settings_set(struct bt_mesh_model *model, const char *name, size_t len_rd,
-				    settings_read_cb read_cb, void *cb_data)
+static int sar_cfg_srv_settings_set(const struct bt_mesh_model *model, const char *name,
+				    size_t len_rd, settings_read_cb read_cb,
+				    void *cb_data)
 {
 	if (!strncmp(name, "sar_rx", 5)) {
 		return bt_mesh_settings_set(read_cb, cb_data, &bt_mesh.sar_rx,
diff --git a/subsys/bluetooth/mesh/shell/blob.c b/subsys/bluetooth/mesh/shell/blob.c
index a3ecdee241e..ed0f4fbd458 100644
--- a/subsys/bluetooth/mesh/shell/blob.c
+++ b/subsys/bluetooth/mesh/shell/blob.c
@@ -271,7 +271,7 @@ static int cmd_flash_stream_unset(const struct shell *sh, size_t argc, char *arg
 
 #if defined(CONFIG_BT_MESH_SHELL_BLOB_CLI)
 
-static struct bt_mesh_model *mod_cli;
+static const struct bt_mesh_model *mod_cli;
 
 static void blob_cli_inputs_prepare(uint16_t group)
 {
@@ -351,7 +351,7 @@ static int cmd_tx(const struct shell *sh, size_t argc, char *argv[])
 			    "pull",
 		    blob_cli_xfer.xfer.size, group);
 
-	err = bt_mesh_blob_cli_send((struct bt_mesh_blob_cli *)mod_cli->user_data,
+	err = bt_mesh_blob_cli_send((struct bt_mesh_blob_cli *)*(mod_cli->user_data),
 				    &blob_cli_xfer.inputs,
 				    &blob_cli_xfer.xfer, bt_mesh_shell_blob_io);
 	if (err) {
@@ -421,7 +421,7 @@ static int cmd_caps(const struct shell *sh, size_t argc, char *argv[])
 
 	blob_cli_inputs_prepare(group);
 
-	err = bt_mesh_blob_cli_caps_get((struct bt_mesh_blob_cli *)mod_cli->user_data,
+	err = bt_mesh_blob_cli_caps_get((struct bt_mesh_blob_cli *)*(mod_cli->user_data),
 					&blob_cli_xfer.inputs);
 	if (err) {
 		shell_print(sh, "Boundary check start failed (err: %d)", err);
@@ -438,7 +438,7 @@ static int cmd_tx_cancel(const struct shell *sh, size_t argc,
 	}
 
 	shell_print(sh, "Cancelling transfer");
-	bt_mesh_blob_cli_cancel((struct bt_mesh_blob_cli *)mod_cli->user_data);
+	bt_mesh_blob_cli_cancel((struct bt_mesh_blob_cli *)*(mod_cli->user_data));
 
 	return 0;
 }
@@ -465,7 +465,7 @@ static int cmd_tx_get(const struct shell *sh, size_t argc, char *argv[])
 
 	blob_cli_inputs_prepare(group);
 
-	err = bt_mesh_blob_cli_xfer_progress_get((struct bt_mesh_blob_cli *)mod_cli->user_data,
+	err = bt_mesh_blob_cli_xfer_progress_get((struct bt_mesh_blob_cli *)*(mod_cli->user_data),
 						 &blob_cli_xfer.inputs);
 	if (err) {
 		shell_print(sh, "ERR %d", err);
@@ -482,7 +482,7 @@ static int cmd_tx_suspend(const struct shell *sh, size_t argc,
 	}
 
 	shell_print(sh, "Suspending transfer");
-	bt_mesh_blob_cli_suspend((struct bt_mesh_blob_cli *)mod_cli->user_data);
+	bt_mesh_blob_cli_suspend((struct bt_mesh_blob_cli *)*(mod_cli->user_data));
 
 	return 0;
 }
@@ -494,7 +494,7 @@ static int cmd_tx_resume(const struct shell *sh, size_t argc, char *argv[])
 	}
 
 	shell_print(sh, "Resuming transfer");
-	bt_mesh_blob_cli_resume((struct bt_mesh_blob_cli *)mod_cli->user_data);
+	bt_mesh_blob_cli_resume((struct bt_mesh_blob_cli *)*(mod_cli->user_data));
 
 	return 0;
 }
@@ -503,7 +503,7 @@ static int cmd_tx_resume(const struct shell *sh, size_t argc, char *argv[])
 
 #if defined(CONFIG_BT_MESH_SHELL_BLOB_SRV)
 
-static struct bt_mesh_model *mod_srv;
+static const struct bt_mesh_model *mod_srv;
 
 static int cmd_rx(const struct shell *sh, size_t argc, char *argv[])
 {
@@ -530,7 +530,7 @@ static int cmd_rx(const struct shell *sh, size_t argc, char *argv[])
 	}
 
 	shell_print(sh, "Receive BLOB 0x%x", id);
-	err = bt_mesh_blob_srv_recv((struct bt_mesh_blob_srv *)mod_srv->user_data,
+	err = bt_mesh_blob_srv_recv((struct bt_mesh_blob_srv *)*(mod_srv->user_data),
 				    id, bt_mesh_shell_blob_io, BT_MESH_TTL_MAX, timeout_base);
 	if (err) {
 		shell_print(sh, "BLOB RX setup failed (%d)", err);
@@ -548,7 +548,7 @@ static int cmd_rx_cancel(const struct shell *sh, size_t argc, char *argv[])
 	}
 
 	shell_print(sh, "Cancelling BLOB rx");
-	err = bt_mesh_blob_srv_cancel((struct bt_mesh_blob_srv *)mod_srv->user_data);
+	err = bt_mesh_blob_srv_cancel((struct bt_mesh_blob_srv *)*(mod_srv->user_data));
 	if (err) {
 		shell_print(sh, "BLOB cancel failed (%d)", err);
 	}
diff --git a/subsys/bluetooth/mesh/shell/dfd.c b/subsys/bluetooth/mesh/shell/dfd.c
index 0415929dfec..464a5340342 100644
--- a/subsys/bluetooth/mesh/shell/dfd.c
+++ b/subsys/bluetooth/mesh/shell/dfd.c
@@ -14,7 +14,7 @@
 #include "../dfd_srv_internal.h"
 #include "../access.h"
 
-static struct bt_mesh_model *mod;
+static const struct bt_mesh_model *mod;
 
 static void print_receivers_status(const struct shell *sh, struct bt_mesh_dfd_srv *srv,
 				   enum bt_mesh_dfd_status status)
@@ -70,7 +70,7 @@ static int cmd_dfd_receivers_add(const struct shell *sh, size_t argc, char *argv
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	if (bt_mesh_dfu_cli_is_busy(&dfd_srv->dfu)) {
 		print_receivers_status(sh, dfd_srv,
@@ -122,7 +122,7 @@ static int cmd_dfd_receivers_delete_all(const struct shell *sh, size_t argc, cha
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	enum bt_mesh_dfd_status status = bt_mesh_dfd_srv_receivers_delete_all(
 		dfd_srv);
@@ -142,7 +142,7 @@ static int cmd_dfd_receivers_get(const struct shell *sh, size_t argc, char *argv
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 	int err = 0;
 
 	uint16_t first = shell_strtoul(argv[1], 0, &err);
@@ -197,7 +197,7 @@ static int cmd_dfd_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	print_dfd_status(sh, dfd_srv, BT_MESH_DFD_SUCCESS);
 
@@ -210,7 +210,7 @@ static int cmd_dfd_start(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 	struct bt_mesh_dfd_start_params params;
 	int err = 0;
 
@@ -267,7 +267,7 @@ static int cmd_dfd_suspend(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	enum bt_mesh_dfd_status status = bt_mesh_dfd_srv_suspend(dfd_srv);
 
@@ -285,7 +285,7 @@ static int cmd_dfd_cancel(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	enum bt_mesh_dfd_status status = bt_mesh_dfd_srv_cancel(dfd_srv, NULL);
 
@@ -303,7 +303,7 @@ static int cmd_dfd_apply(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	enum bt_mesh_dfd_status status = bt_mesh_dfd_srv_apply(dfd_srv);
 
@@ -364,7 +364,7 @@ static int cmd_dfd_fw_delete(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	uint8_t fwid_buf[CONFIG_BT_MESH_DFU_FWID_MAXLEN];
 	size_t hexlen = strlen(argv[1]);
@@ -394,7 +394,7 @@ static int cmd_dfd_fw_delete_all(const struct shell *sh, size_t argc, char *argv
 		return -ENODEV;
 	}
 
-	struct bt_mesh_dfd_srv *dfd_srv = mod->user_data;
+	struct bt_mesh_dfd_srv *dfd_srv = *(mod->user_data);
 
 	enum bt_mesh_dfd_status status = bt_mesh_dfd_srv_fw_delete_all(dfd_srv);
 
diff --git a/subsys/bluetooth/mesh/shell/dfu.c b/subsys/bluetooth/mesh/shell/dfu.c
index 8d7fc96e014..22c60dc17c8 100644
--- a/subsys/bluetooth/mesh/shell/dfu.c
+++ b/subsys/bluetooth/mesh/shell/dfu.c
@@ -505,7 +505,7 @@ static int cmd_dfu_slot_get(const struct shell *sh, size_t argc, char *argv[])
 
 #if defined(CONFIG_BT_MESH_SHELL_DFU_CLI)
 
-static struct bt_mesh_model *mod_cli;
+static const struct bt_mesh_model *mod_cli;
 
 static struct {
 	struct bt_mesh_dfu_target targets[32];
@@ -587,7 +587,7 @@ static int cmd_dfu_target_state(const struct shell *sh, size_t argc, char *argv[
 		return -ENODEV;
 	}
 
-	err = bt_mesh_dfu_cli_status_get((struct bt_mesh_dfu_cli *)mod_cli->user_data,
+	err = bt_mesh_dfu_cli_status_get((struct bt_mesh_dfu_cli *)*(mod_cli->user_data),
 					 &ctx, &rsp);
 	if (err) {
 		shell_print(sh, "Failed getting target status (err: %d)",
@@ -654,7 +654,7 @@ static int cmd_dfu_target_imgs(const struct shell *sh, size_t argc, char *argv[]
 
 	shell_print(sh, "Requesting DFU images in 0x%04x", bt_mesh_shell_target_ctx.dst);
 
-	err = bt_mesh_dfu_cli_imgs_get((struct bt_mesh_dfu_cli *)mod_cli->user_data,
+	err = bt_mesh_dfu_cli_imgs_get((struct bt_mesh_dfu_cli *)*(mod_cli->user_data),
 				       &ctx, dfu_img_cb, NULL, img_cnt);
 	if (err) {
 		shell_print(sh, "Request failed (err: %d)", err);
@@ -694,7 +694,7 @@ static int cmd_dfu_target_check(const struct shell *sh, size_t argc, char *argv[
 		return 0;
 	}
 
-	err = bt_mesh_dfu_cli_metadata_check((struct bt_mesh_dfu_cli *)mod_cli->user_data,
+	err = bt_mesh_dfu_cli_metadata_check((struct bt_mesh_dfu_cli *)*(mod_cli->user_data),
 					     &ctx, img_idx, slot, &rsp);
 	if (err) {
 		shell_print(sh, "Metadata check failed. err: %d", err);
@@ -765,7 +765,7 @@ static int cmd_dfu_send(const struct shell *sh, size_t argc, char *argv[])
 	dfu_tx.inputs.app_idx = bt_mesh_shell_target_ctx.app_idx;
 	dfu_tx.inputs.ttl = BT_MESH_TTL_DEFAULT;
 
-	err = bt_mesh_dfu_cli_send((struct bt_mesh_dfu_cli *)mod_cli->user_data,
+	err = bt_mesh_dfu_cli_send((struct bt_mesh_dfu_cli *)*(mod_cli->user_data),
 				   &dfu_tx.inputs, bt_mesh_shell_blob_io, &xfer);
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
@@ -800,7 +800,7 @@ static int cmd_dfu_tx_cancel(const struct shell *sh, size_t argc, char *argv[])
 		shell_print(sh, "Cancelling DFU");
 	}
 
-	err = bt_mesh_dfu_cli_cancel((struct bt_mesh_dfu_cli *)mod_cli->user_data,
+	err = bt_mesh_dfu_cli_cancel((struct bt_mesh_dfu_cli *)*(mod_cli->user_data),
 				     (argc == 2) ? &ctx : NULL);
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
@@ -819,7 +819,7 @@ static int cmd_dfu_apply(const struct shell *sh, size_t argc, char *argv[])
 
 	shell_print(sh, "Applying DFU");
 
-	err = bt_mesh_dfu_cli_apply((struct bt_mesh_dfu_cli *)mod_cli->user_data);
+	err = bt_mesh_dfu_cli_apply((struct bt_mesh_dfu_cli *)*(mod_cli->user_data));
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
 	}
@@ -837,7 +837,7 @@ static int cmd_dfu_confirm(const struct shell *sh, size_t argc, char *argv[])
 
 	shell_print(sh, "Confirming DFU");
 
-	err = bt_mesh_dfu_cli_confirm((struct bt_mesh_dfu_cli *)mod_cli->user_data);
+	err = bt_mesh_dfu_cli_confirm((struct bt_mesh_dfu_cli *)*(mod_cli->user_data));
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
 	}
@@ -855,7 +855,7 @@ static int cmd_dfu_suspend(const struct shell *sh, size_t argc, char *argv[])
 
 	shell_print(sh, "Suspending DFU");
 
-	err = bt_mesh_dfu_cli_suspend((struct bt_mesh_dfu_cli *)mod_cli->user_data);
+	err = bt_mesh_dfu_cli_suspend((struct bt_mesh_dfu_cli *)*(mod_cli->user_data));
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
 	}
@@ -873,7 +873,7 @@ static int cmd_dfu_resume(const struct shell *sh, size_t argc, char *argv[])
 
 	shell_print(sh, "Resuming DFU");
 
-	err = bt_mesh_dfu_cli_resume((struct bt_mesh_dfu_cli *)mod_cli->user_data);
+	err = bt_mesh_dfu_cli_resume((struct bt_mesh_dfu_cli *)*(mod_cli->user_data));
 	if (err) {
 		shell_print(sh, "Failed (err: %d)", err);
 	}
@@ -888,7 +888,7 @@ static int cmd_dfu_tx_progress(const struct shell *sh, size_t argc, char *argv[]
 	}
 
 	shell_print(sh, "DFU progress: %u %%",
-		    bt_mesh_dfu_cli_progress((struct bt_mesh_dfu_cli *)mod_cli->user_data));
+		    bt_mesh_dfu_cli_progress((struct bt_mesh_dfu_cli *)*(mod_cli->user_data)));
 	return 0;
 }
 
@@ -896,7 +896,7 @@ static int cmd_dfu_tx_progress(const struct shell *sh, size_t argc, char *argv[]
 
 #if defined(CONFIG_BT_MESH_SHELL_DFU_SRV)
 
-static struct bt_mesh_model *mod_srv;
+static const struct bt_mesh_model *mod_srv;
 
 static int cmd_dfu_applied(const struct shell *sh, size_t argc, char *argv[])
 {
@@ -904,7 +904,7 @@ static int cmd_dfu_applied(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	bt_mesh_dfu_srv_applied((struct bt_mesh_dfu_srv *)mod_srv->user_data);
+	bt_mesh_dfu_srv_applied((struct bt_mesh_dfu_srv *)*(mod_srv->user_data));
 	return 0;
 }
 
@@ -914,7 +914,7 @@ static int cmd_dfu_rx_cancel(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	bt_mesh_dfu_srv_cancel((struct bt_mesh_dfu_srv *)mod_srv->user_data);
+	bt_mesh_dfu_srv_cancel((struct bt_mesh_dfu_srv *)*(mod_srv->user_data));
 	return 0;
 }
 
@@ -925,7 +925,7 @@ static int cmd_dfu_rx_progress(const struct shell *sh, size_t argc, char *argv[]
 	}
 
 	shell_print(sh, "DFU progress: %u %%",
-		    bt_mesh_dfu_srv_progress((struct bt_mesh_dfu_srv *)mod_srv->user_data));
+		    bt_mesh_dfu_srv_progress((struct bt_mesh_dfu_srv *)*(mod_srv->user_data)));
 	return 0;
 }
 
diff --git a/subsys/bluetooth/mesh/shell/health.c b/subsys/bluetooth/mesh/shell/health.c
index efc7eb84e62..a0ca150ae15 100644
--- a/subsys/bluetooth/mesh/shell/health.c
+++ b/subsys/bluetooth/mesh/shell/health.c
@@ -13,7 +13,7 @@
 #include "utils.h"
 #include <zephyr/bluetooth/mesh/shell.h>
 
-static struct bt_mesh_model *mod;
+static const struct bt_mesh_model *mod;
 
 static void show_faults(const struct shell *sh, uint8_t test_id, uint16_t cid, uint8_t *faults,
 			size_t fault_count)
@@ -40,7 +40,7 @@ static int cmd_fault_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t faults[32];
@@ -74,7 +74,7 @@ static int fault_clear(const struct shell *sh, size_t argc, char *argv[], bool a
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t test_id;
@@ -126,7 +126,7 @@ static int fault_test(const struct shell *sh, size_t argc, char *argv[], bool ac
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t test_id;
@@ -179,7 +179,7 @@ static int cmd_period_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t divisor;
@@ -201,7 +201,7 @@ static int period_set(const struct shell *sh, size_t argc, char *argv[], bool ac
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t divisor;
@@ -251,7 +251,7 @@ static int cmd_attention_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t attention;
@@ -273,7 +273,7 @@ static int attention_set(const struct shell *sh, size_t argc, char *argv[], bool
 		return -ENODEV;
 	}
 
-	struct bt_mesh_health_cli *cli = mod->user_data;
+	struct bt_mesh_health_cli *cli = *(mod->user_data);
 	struct bt_mesh_msg_ctx ctx = BT_MESH_MSG_CTX_INIT_APP(bt_mesh_shell_target_ctx.app_idx,
 							      bt_mesh_shell_target_ctx.dst);
 	uint8_t attention;
diff --git a/subsys/bluetooth/mesh/shell/rpr.c b/subsys/bluetooth/mesh/shell/rpr.c
index c8f05817104..1ddb11f497d 100644
--- a/subsys/bluetooth/mesh/shell/rpr.c
+++ b/subsys/bluetooth/mesh/shell/rpr.c
@@ -11,7 +11,7 @@
 
 #include "utils.h"
 
-static struct bt_mesh_model *mod;
+static const struct bt_mesh_model *mod;
 
 /***************************************************************************************************
  * Implementation of the model's instance
@@ -108,7 +108,7 @@ static int cmd_scan(const struct shell *sh, size_t argc, char *argv[])
 		hex2bin(argv[2], strlen(argv[2]), uuid, 16);
 	}
 
-	err = bt_mesh_rpr_scan_start((struct bt_mesh_rpr_cli *)mod->user_data,
+	err = bt_mesh_rpr_scan_start((struct bt_mesh_rpr_cli *)*(mod->user_data),
 				     &srv, argc > 2 ? uuid : NULL, timeout,
 				     BT_MESH_RPR_SCAN_MAX_DEVS_ANY, &rsp);
 	if (err) {
@@ -153,7 +153,7 @@ static int cmd_scan_ext(const struct shell *sh, size_t argc, char *argv[])
 		return err;
 	}
 
-	err = bt_mesh_rpr_scan_start_ext((struct bt_mesh_rpr_cli *)mod->user_data,
+	err = bt_mesh_rpr_scan_start_ext((struct bt_mesh_rpr_cli *)*(mod->user_data),
 					 &srv, uuid, timeout, ad_types,
 					 (argc - 3));
 	if (err) {
@@ -189,7 +189,7 @@ static int cmd_scan_srv(const struct shell *sh, size_t argc, char *argv[])
 		return err;
 	}
 
-	err = bt_mesh_rpr_scan_start_ext((struct bt_mesh_rpr_cli *)mod->user_data,
+	err = bt_mesh_rpr_scan_start_ext((struct bt_mesh_rpr_cli *)*(mod->user_data),
 					 &srv, NULL, 0, ad_types, (argc - 1));
 	if (err) {
 		shell_print(sh, "Scan start failed: %d", err);
@@ -213,7 +213,7 @@ static int cmd_scan_caps(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	err = bt_mesh_rpr_scan_caps_get((struct bt_mesh_rpr_cli *)mod->user_data, &srv, &caps);
+	err = bt_mesh_rpr_scan_caps_get((struct bt_mesh_rpr_cli *)*(mod->user_data), &srv, &caps);
 	if (err) {
 		shell_print(sh, "Scan capabilities get failed: %d", err);
 		return err;
@@ -241,7 +241,7 @@ static int cmd_scan_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	err = bt_mesh_rpr_scan_get((struct bt_mesh_rpr_cli *)mod->user_data, &srv, &rsp);
+	err = bt_mesh_rpr_scan_get((struct bt_mesh_rpr_cli *)*(mod->user_data), &srv, &rsp);
 	if (err) {
 		shell_print(sh, "Scan get failed: %d", err);
 		return err;
@@ -269,7 +269,7 @@ static int cmd_scan_stop(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	err = bt_mesh_rpr_scan_stop((struct bt_mesh_rpr_cli *)mod->user_data, &srv, &rsp);
+	err = bt_mesh_rpr_scan_stop((struct bt_mesh_rpr_cli *)*(mod->user_data), &srv, &rsp);
 	if (err || rsp.status) {
 		shell_print(sh, "Scan stop failed: %d %u", err, rsp.status);
 		return err;
@@ -294,7 +294,7 @@ static int cmd_link_get(const struct shell *sh, size_t argc, char *argv[])
 		return -ENODEV;
 	}
 
-	err = bt_mesh_rpr_link_get((struct bt_mesh_rpr_cli *)mod->user_data, &srv, &rsp);
+	err = bt_mesh_rpr_link_get((struct bt_mesh_rpr_cli *)*(mod->user_data), &srv, &rsp);
 	if (err) {
 		shell_print(sh, "Link get failed: %d %u", err, rsp.status);
 		return err;
@@ -316,7 +316,7 @@ static int cmd_link_close(const struct shell *sh, size_t argc, char *argv[])
 	};
 	int err;
 
-	err = bt_mesh_rpr_link_close((struct bt_mesh_rpr_cli *)mod->user_data, &srv, &rsp);
+	err = bt_mesh_rpr_link_close((struct bt_mesh_rpr_cli *)*(mod->user_data), &srv, &rsp);
 	if (err) {
 		shell_print(sh, "Link close failed: %d %u", err, rsp.status);
 		return err;
@@ -355,7 +355,7 @@ static int cmd_provision_remote(const struct shell *sh, size_t argc, char *argv[
 		return err;
 	}
 
-	err = bt_mesh_provision_remote((struct bt_mesh_rpr_cli *)mod->user_data,
+	err = bt_mesh_provision_remote((struct bt_mesh_rpr_cli *)*(mod->user_data),
 				       &srv, uuid, net_idx, addr);
 	if (err) {
 		shell_print(sh, "Prov remote start failed: %d", err);
@@ -396,7 +396,7 @@ static int cmd_reprovision_remote(const struct shell *sh, size_t argc, char *arg
 		return err;
 	}
 
-	err = bt_mesh_reprovision_remote((struct bt_mesh_rpr_cli *)mod->user_data,
+	err = bt_mesh_reprovision_remote((struct bt_mesh_rpr_cli *)*(mod->user_data),
 					 &srv, addr, composition_changed);
 	if (err) {
 		shell_print(sh, "Reprovisioning failed: %d", err);
diff --git a/subsys/bluetooth/mesh/shell/shell.c b/subsys/bluetooth/mesh/shell/shell.c
index c1bad5d24ad..3a28829877b 100644
--- a/subsys/bluetooth/mesh/shell/shell.c
+++ b/subsys/bluetooth/mesh/shell/shell.c
@@ -68,7 +68,7 @@ static void get_faults(uint8_t *faults, uint8_t faults_size, uint8_t *dst, uint8
 	}
 }
 
-static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
+static int fault_get_cur(const struct bt_mesh_model *model, uint8_t *test_id,
 			 uint16_t *company_id, uint8_t *faults, uint8_t *fault_count)
 {
 	shell_print_ctx("Sending current faults");
@@ -81,7 +81,7 @@ static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
 	return 0;
 }
 
-static int fault_get_reg(struct bt_mesh_model *model, uint16_t cid,
+static int fault_get_reg(const struct bt_mesh_model *model, uint16_t cid,
 			 uint8_t *test_id, uint8_t *faults, uint8_t *fault_count)
 {
 	if (cid != CONFIG_BT_COMPANY_ID) {
@@ -99,7 +99,7 @@ static int fault_get_reg(struct bt_mesh_model *model, uint16_t cid,
 	return 0;
 }
 
-static int fault_clear(struct bt_mesh_model *model, uint16_t cid)
+static int fault_clear(const struct bt_mesh_model *model, uint16_t cid)
 {
 	if (cid != CONFIG_BT_COMPANY_ID) {
 		return -EINVAL;
@@ -110,7 +110,7 @@ static int fault_clear(struct bt_mesh_model *model, uint16_t cid)
 	return 0;
 }
 
-static int fault_test(struct bt_mesh_model *model, uint8_t test_id,
+static int fault_test(const struct bt_mesh_model *model, uint8_t test_id,
 		      uint16_t cid)
 {
 	if (cid != CONFIG_BT_COMPANY_ID) {
@@ -124,12 +124,12 @@ static int fault_test(struct bt_mesh_model *model, uint8_t test_id,
 	return 0;
 }
 
-static void attention_on(struct bt_mesh_model *model)
+static void attention_on(const struct bt_mesh_model *model)
 {
 	shell_print_ctx("Attention On");
 }
 
-static void attention_off(struct bt_mesh_model *model)
+static void attention_off(const struct bt_mesh_model *model)
 {
 	shell_print_ctx("Attention Off");
 }
diff --git a/subsys/bluetooth/mesh/shell/utils.c b/subsys/bluetooth/mesh/shell/utils.c
index 8b7ca740663..1d8ab79951d 100644
--- a/subsys/bluetooth/mesh/shell/utils.c
+++ b/subsys/bluetooth/mesh/shell/utils.c
@@ -13,7 +13,7 @@
 #include "mesh/access.h"
 #include "utils.h"
 
-bool bt_mesh_shell_mdl_first_get(uint16_t id, struct bt_mesh_model **mod)
+bool bt_mesh_shell_mdl_first_get(uint16_t id, const struct bt_mesh_model **mod)
 {
 	const struct bt_mesh_comp *comp = bt_mesh_comp_get();
 
@@ -27,10 +27,10 @@ bool bt_mesh_shell_mdl_first_get(uint16_t id, struct bt_mesh_model **mod)
 	return false;
 }
 
-int bt_mesh_shell_mdl_instance_set(const struct shell *sh, struct bt_mesh_model **mod,
+int bt_mesh_shell_mdl_instance_set(const struct shell *sh, const struct bt_mesh_model **mod,
 				 uint16_t mod_id, uint8_t elem_idx)
 {
-	struct bt_mesh_model *mod_temp;
+	const struct bt_mesh_model *mod_temp;
 	const struct bt_mesh_comp *comp = bt_mesh_comp_get();
 
 	if (elem_idx >= comp->elem_count) {
@@ -53,14 +53,14 @@ int bt_mesh_shell_mdl_instance_set(const struct shell *sh, struct bt_mesh_model
 int bt_mesh_shell_mdl_print_all(const struct shell *sh, uint16_t mod_id)
 {
 	const struct bt_mesh_comp *comp = bt_mesh_comp_get();
-	struct bt_mesh_model *mod;
+	const struct bt_mesh_model *mod;
 
 	for (int i = 0; i < comp->elem_count; i++) {
 		mod = bt_mesh_model_find(&comp->elem[i], mod_id);
 		if (mod) {
 			shell_print(sh,
 				    "Client model instance found at addr 0x%.4X. Element index: %d",
-				    comp->elem[i].addr, mod->elem_idx);
+				    comp->elem[i].addr, *(mod->elem_idx));
 		}
 	}
 
diff --git a/subsys/bluetooth/mesh/shell/utils.h b/subsys/bluetooth/mesh/shell/utils.h
index 222f1f29360..83d025d47ea 100644
--- a/subsys/bluetooth/mesh/shell/utils.h
+++ b/subsys/bluetooth/mesh/shell/utils.h
@@ -34,9 +34,9 @@
 					     0), \
 			       SHELL_SUBCMD_SET_END);
 
-bool bt_mesh_shell_mdl_first_get(uint16_t id, struct bt_mesh_model **mod);
+bool bt_mesh_shell_mdl_first_get(uint16_t id, const struct bt_mesh_model **mod);
 
-int bt_mesh_shell_mdl_instance_set(const struct shell *sh, struct bt_mesh_model **mod,
+int bt_mesh_shell_mdl_instance_set(const struct shell *sh, const struct bt_mesh_model **mod,
 			      uint16_t mod_id, uint8_t elem_idx);
 
 int bt_mesh_shell_mdl_print_all(const struct shell *sh, uint16_t mod_id);
diff --git a/subsys/bluetooth/mesh/sol_pdu_rpl_cli.c b/subsys/bluetooth/mesh/sol_pdu_rpl_cli.c
index 3b8f6799b28..05457eff338 100644
--- a/subsys/bluetooth/mesh/sol_pdu_rpl_cli.c
+++ b/subsys/bluetooth/mesh/sol_pdu_rpl_cli.c
@@ -22,7 +22,7 @@ struct sol_rpl_param {
 	uint8_t *len;
 };
 
-static int handle_status(struct bt_mesh_model *mod,
+static int handle_status(const struct bt_mesh_model *mod,
 			 struct bt_mesh_msg_ctx *ctx,
 			 struct net_buf_simple *buf)
 {
@@ -160,7 +160,7 @@ void bt_mesh_sol_pdu_rpl_cli_timeout_set(int32_t timeout)
 	msg_timeout = timeout;
 }
 
-static int sol_pdu_rpl_cli_init(struct bt_mesh_model *mod)
+static int sol_pdu_rpl_cli_init(const struct bt_mesh_model *mod)
 {
 	if (!bt_mesh_model_in_primary(mod)) {
 		LOG_ERR("Solicitation PDU RPL Configuration client not in primary element");
@@ -169,7 +169,7 @@ static int sol_pdu_rpl_cli_init(struct bt_mesh_model *mod)
 
 	msg_timeout = CONFIG_BT_MESH_SOL_PDU_RPL_CLI_TIMEOUT;
 
-	cli = mod->user_data;
+	cli = *(mod->user_data);
 	cli->model = mod;
 	bt_mesh_msg_ack_ctx_init(&cli->ack_ctx);
 	return 0;
diff --git a/subsys/bluetooth/mesh/sol_pdu_rpl_srv.c b/subsys/bluetooth/mesh/sol_pdu_rpl_srv.c
index e0fff397640..547494be3be 100644
--- a/subsys/bluetooth/mesh/sol_pdu_rpl_srv.c
+++ b/subsys/bluetooth/mesh/sol_pdu_rpl_srv.c
@@ -14,7 +14,7 @@
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(bt_mesh_sol_pdu_rpl_srv);
 
-static void sol_rpl_status_rsp(struct bt_mesh_model *mod,
+static void sol_rpl_status_rsp(const struct bt_mesh_model *mod,
 			       struct bt_mesh_msg_ctx *ctx,
 			       uint16_t range,
 			       uint8_t len)
@@ -32,7 +32,7 @@ static void sol_rpl_status_rsp(struct bt_mesh_model *mod,
 	bt_mesh_model_send(mod, ctx, &buf, NULL, NULL);
 }
 
-static int item_clear(struct bt_mesh_model *mod,
+static int item_clear(const struct bt_mesh_model *mod,
 		      struct bt_mesh_msg_ctx *ctx,
 		      struct net_buf_simple *buf,
 		      bool acked)
@@ -78,14 +78,14 @@ static int item_clear(struct bt_mesh_model *mod,
 	return 0;
 }
 
-static int handle_item_clear(struct bt_mesh_model *mod,
+static int handle_item_clear(const struct bt_mesh_model *mod,
 			    struct bt_mesh_msg_ctx *ctx,
 			    struct net_buf_simple *buf)
 {
 	return item_clear(mod, ctx, buf, true);
 }
 
-static int handle_item_clear_unacked(struct bt_mesh_model *mod,
+static int handle_item_clear_unacked(const struct bt_mesh_model *mod,
 				     struct bt_mesh_msg_ctx *ctx,
 				     struct net_buf_simple *buf)
 {
@@ -99,7 +99,7 @@ const struct bt_mesh_model_op _bt_mesh_sol_pdu_rpl_srv_op[] = {
 	BT_MESH_MODEL_OP_END
 };
 
-static int sol_pdu_rpl_srv_init(struct bt_mesh_model *mod)
+static int sol_pdu_rpl_srv_init(const struct bt_mesh_model *mod)
 {
 	if (!bt_mesh_model_in_primary(mod)) {
 		LOG_ERR("Solicitation PDU RPL Configuration server not in primary element");
diff --git a/tests/bluetooth/mesh/basic/src/main.c b/tests/bluetooth/mesh/basic/src/main.c
index 8c6c1796c02..34f94d486c3 100644
--- a/tests/bluetooth/mesh/basic/src/main.c
+++ b/tests/bluetooth/mesh/basic/src/main.c
@@ -15,7 +15,7 @@
 
 static bool has_reg_fault = true;
 
-static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
+static int fault_get_cur(const struct bt_mesh_model *model, uint8_t *test_id,
 			 uint16_t *company_id, uint8_t *faults, uint8_t *fault_count)
 {
 	uint8_t reg_faults[MAX_FAULT] = { [0 ... (MAX_FAULT - 1)] = 0xff };
@@ -30,7 +30,7 @@ static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
 	return 0;
 }
 
-static int fault_get_reg(struct bt_mesh_model *model, uint16_t company_id,
+static int fault_get_reg(const struct bt_mesh_model *model, uint16_t company_id,
 			 uint8_t *test_id, uint8_t *faults, uint8_t *fault_count)
 {
 	if (company_id != BT_COMP_ID_LF) {
@@ -53,7 +53,7 @@ static int fault_get_reg(struct bt_mesh_model *model, uint16_t company_id,
 	return 0;
 }
 
-static int fault_clear(struct bt_mesh_model *model, uint16_t company_id)
+static int fault_clear(const struct bt_mesh_model *model, uint16_t company_id)
 {
 	if (company_id != BT_COMP_ID_LF) {
 		return -EINVAL;
@@ -64,7 +64,7 @@ static int fault_clear(struct bt_mesh_model *model, uint16_t company_id)
 	return 0;
 }
 
-static int fault_test(struct bt_mesh_model *model, uint8_t test_id,
+static int fault_test(const struct bt_mesh_model *model, uint8_t test_id,
 		      uint16_t company_id)
 {
 	if (company_id != BT_COMP_ID_LF) {
@@ -90,12 +90,12 @@ static struct bt_mesh_health_srv health_srv = {
 
 BT_MESH_HEALTH_PUB_DEFINE(health_pub, MAX_FAULT);
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
 };
 
-static int vnd_publish(struct bt_mesh_model *mod)
+static int vnd_publish(const struct bt_mesh_model *mod)
 {
 	printk("Vendor publish\n");
 	return 0;
@@ -109,7 +109,7 @@ static const struct bt_mesh_model_op vnd_ops[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-static struct bt_mesh_model vnd_models[] = {
+static const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND(BT_COMP_ID_LF, 0x1234, vnd_ops, &vnd_pub, NULL),
 	BT_MESH_MODEL_VND(BT_COMP_ID_LF, 0x4321, vnd_ops, &vnd_pub2, NULL),
 };
diff --git a/tests/bluetooth/mesh_shell/src/main.c b/tests/bluetooth/mesh_shell/src/main.c
index 60863f7455a..b562e428d11 100644
--- a/tests/bluetooth/mesh_shell/src/main.c
+++ b/tests/bluetooth/mesh_shell/src/main.c
@@ -43,7 +43,7 @@ struct bt_mesh_large_comp_data_cli large_comp_data_cli;
 
 BT_MESH_SHELL_HEALTH_PUB_DEFINE(health_pub);
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_SRV(&bt_mesh_shell_health_srv, &health_pub),
diff --git a/tests/bluetooth/tester/src/btp_mesh.c b/tests/bluetooth/tester/src/btp_mesh.c
index bdc37c2f2e5..36e627abe8c 100644
--- a/tests/bluetooth/tester/src/btp_mesh.c
+++ b/tests/bluetooth/tester/src/btp_mesh.c
@@ -454,7 +454,7 @@ static struct bt_mesh_dfu_srv dfu_srv =
 #define AUTH_METHOD_INPUT 0x03
 
 static struct model_data {
-	struct bt_mesh_model *model;
+	const struct bt_mesh_model *model;
 	uint16_t addr;
 	uint16_t appkey_idx;
 } model_bound[MODEL_BOUNDS_MAX];
@@ -587,7 +587,7 @@ static void get_faults(uint8_t *faults, uint8_t faults_size, uint8_t *dst, uint8
 	}
 }
 
-static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
+static int fault_get_cur(const struct bt_mesh_model *model, uint8_t *test_id,
 			 uint16_t *company_id, uint8_t *faults, uint8_t *fault_count)
 {
 	LOG_DBG("");
@@ -600,7 +600,7 @@ static int fault_get_cur(struct bt_mesh_model *model, uint8_t *test_id,
 	return 0;
 }
 
-static int fault_get_reg(struct bt_mesh_model *model, uint16_t company_id,
+static int fault_get_reg(const struct bt_mesh_model *model, uint16_t company_id,
 			 uint8_t *test_id, uint8_t *faults, uint8_t *fault_count)
 {
 	LOG_DBG("company_id 0x%04x", company_id);
@@ -616,7 +616,7 @@ static int fault_get_reg(struct bt_mesh_model *model, uint16_t company_id,
 	return 0;
 }
 
-static int fault_clear(struct bt_mesh_model *model, uint16_t company_id)
+static int fault_clear(const struct bt_mesh_model *model, uint16_t company_id)
 {
 	LOG_DBG("company_id 0x%04x", company_id);
 
@@ -629,7 +629,7 @@ static int fault_clear(struct bt_mesh_model *model, uint16_t company_id)
 	return 0;
 }
 
-static int fault_test(struct bt_mesh_model *model, uint8_t test_id,
+static int fault_test(const struct bt_mesh_model *model, uint8_t test_id,
 		      uint16_t company_id)
 {
 	LOG_DBG("test_id 0x%02x company_id 0x%04x", test_id, company_id);
@@ -1024,7 +1024,7 @@ static uint8_t proxy_solicit(const void *cmd, uint16_t cmd_len,
 }
 #endif /* CONFIG_BT_MESH_PROXY_SOLICITATION */
 
-static struct bt_mesh_model root_models[] = {
+static const struct bt_mesh_model root_models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_HEALTH_SRV(&health_srv, &health_pub),
@@ -1091,7 +1091,7 @@ struct model_data *lookup_model_bound(uint16_t id)
 
 	return NULL;
 }
-static struct bt_mesh_model vnd_models[] = {
+static const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND(CID_LOCAL, VND_MODEL_ID_1, BT_MESH_MODEL_NO_OPS, NULL,
 			  NULL),
 };
@@ -1715,7 +1715,7 @@ static uint8_t model_send(const void *cmd, uint16_t cmd_len,
 {
 	const struct btp_mesh_model_send_cmd *cp = cmd;
 	NET_BUF_SIMPLE_DEFINE(msg, UINT8_MAX);
-	struct bt_mesh_model *model = NULL;
+	const struct bt_mesh_model *model = NULL;
 	uint16_t src;
 	int err;
 
@@ -5228,7 +5228,7 @@ void model_recv_ev(uint16_t src, uint16_t dst, const void *payload,
 	tester_event(BTP_SERVICE_ID_MESH, BTP_MESH_EV_MODEL_RECV, buf.data, buf.len);
 }
 
-static void model_bound_cb(uint16_t addr, struct bt_mesh_model *model,
+static void model_bound_cb(uint16_t addr, const struct bt_mesh_model *model,
 			   uint16_t key_idx)
 {
 	int i;
@@ -5249,7 +5249,7 @@ static void model_bound_cb(uint16_t addr, struct bt_mesh_model *model,
 	LOG_ERR("model_bound is full");
 }
 
-static void model_unbound_cb(uint16_t addr, struct bt_mesh_model *model,
+static void model_unbound_cb(uint16_t addr, const struct bt_mesh_model *model,
 			     uint16_t key_idx)
 {
 	int i;
diff --git a/tests/bsim/bluetooth/mesh/src/mesh_test.c b/tests/bsim/bluetooth/mesh/src/mesh_test.c
index 538af49109e..ea209d9609c 100644
--- a/tests/bsim/bluetooth/mesh/src/mesh_test.c
+++ b/tests/bsim/bluetooth/mesh/src/mesh_test.c
@@ -27,7 +27,7 @@ struct bt_mesh_test_stats test_stats;
 struct bt_mesh_msg_ctx test_send_ctx;
 static void (*ra_cb)(uint8_t *, size_t);
 
-static int msg_rx(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int msg_rx(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 		   struct net_buf_simple *buf)
 {
 	size_t len = buf->len + BT_MESH_MODEL_OP_LEN(TEST_MSG_OP_1);
@@ -75,7 +75,7 @@ static int msg_rx(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 	return 0;
 }
 
-static int ra_rx(struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
+static int ra_rx(const struct bt_mesh_model *mod, struct bt_mesh_msg_ctx *ctx,
 		 struct net_buf_simple *buf)
 {
 	LOG_INF("\tlen: %d bytes", buf->len);
@@ -97,19 +97,19 @@ static const struct bt_mesh_model_op model_op[] = {
 	BT_MESH_MODEL_OP_END
 };
 
-int __weak test_model_pub_update(struct bt_mesh_model *mod)
+int __weak test_model_pub_update(const struct bt_mesh_model *mod)
 {
 	return -1;
 }
 
-int __weak test_model_settings_set(struct bt_mesh_model *model,
+int __weak test_model_settings_set(const struct bt_mesh_model *model,
 				   const char *name, size_t len_rd,
 				   settings_read_cb read_cb, void *cb_arg)
 {
 	return -1;
 }
 
-void __weak test_model_reset(struct bt_mesh_model *model)
+void __weak test_model_reset(const struct bt_mesh_model *model)
 {
 	/* No-op. */
 }
@@ -128,19 +128,19 @@ static const struct bt_mesh_model_op vnd_model_op[] = {
 	BT_MESH_MODEL_OP_END,
 };
 
-int __weak test_vnd_model_pub_update(struct bt_mesh_model *mod)
+int __weak test_vnd_model_pub_update(const struct bt_mesh_model *mod)
 {
 	return -1;
 }
 
-int __weak test_vnd_model_settings_set(struct bt_mesh_model *model,
+int __weak test_vnd_model_settings_set(const struct bt_mesh_model *model,
 				       const char *name, size_t len_rd,
 				       settings_read_cb read_cb, void *cb_arg)
 {
 	return -1;
 }
 
-void __weak test_vnd_model_reset(struct bt_mesh_model *model)
+void __weak test_vnd_model_reset(const struct bt_mesh_model *model)
 {
 	/* No-op. */
 }
@@ -174,7 +174,7 @@ static struct bt_mesh_priv_beacon_cli priv_beacon_cli;
 static struct bt_mesh_od_priv_proxy_cli priv_proxy_cli;
 #endif
 
-static struct bt_mesh_model models[] = {
+static const struct bt_mesh_model models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_CB(TEST_MOD_ID, model_op, &pub, NULL, &test_model_cb),
@@ -195,14 +195,14 @@ static struct bt_mesh_model models[] = {
 #endif
 };
 
-struct bt_mesh_model *test_model = &models[2];
+const struct bt_mesh_model *test_model = &models[2];
 
-static struct bt_mesh_model vnd_models[] = {
+static const struct bt_mesh_model vnd_models[] = {
 	BT_MESH_MODEL_VND_CB(TEST_VND_COMPANY_ID, TEST_VND_MOD_ID, vnd_model_op, &vnd_pub,
 			     NULL, &test_vnd_model_cb),
 };
 
-struct bt_mesh_model *test_vnd_model = &vnd_models[0];
+const struct bt_mesh_model *test_vnd_model = &vnd_models[0];
 
 static struct bt_mesh_elem elems[] = {
 	BT_MESH_ELEM(0, models, vnd_models),
diff --git a/tests/bsim/bluetooth/mesh/src/mesh_test.h b/tests/bsim/bluetooth/mesh/src/mesh_test.h
index 08cf2177796..a5c8694947b 100644
--- a/tests/bsim/bluetooth/mesh/src/mesh_test.h
+++ b/tests/bsim/bluetooth/mesh/src/mesh_test.h
@@ -31,7 +31,7 @@
 #define TEST_VND_COMPANY_ID 0x1234
 #define TEST_VND_MOD_ID   0x5678
 
-#define MODEL_LIST(...) ((struct bt_mesh_model[]){ __VA_ARGS__ })
+#define MODEL_LIST(...) ((const struct bt_mesh_model[]){ __VA_ARGS__ })
 
 #define FAIL(msg, ...)                                                         \
 	do {                                                                   \
@@ -171,8 +171,8 @@ struct bt_mesh_test_sync_ctx {
 
 extern enum bst_result_t bst_result;
 extern const struct bt_mesh_test_cfg *cfg;
-extern struct bt_mesh_model *test_model;
-extern struct bt_mesh_model *test_vnd_model;
+extern const struct bt_mesh_model *test_model;
+extern const struct bt_mesh_model *test_vnd_model;
 extern const uint8_t test_net_key[16];
 extern const uint8_t test_app_key[16];
 extern const uint8_t test_va_uuid[16];
diff --git a/tests/bsim/bluetooth/mesh/src/test_access.c b/tests/bsim/bluetooth/mesh/src/test_access.c
index 9bddf0e8058..dacc30c741e 100644
--- a/tests/bsim/bluetooth/mesh/src/test_access.c
+++ b/tests/bsim/bluetooth/mesh/src/test_access.c
@@ -35,15 +35,15 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_INF);
 #define RX_JITTER_MAX (10 + CONFIG_BT_MESH_NETWORK_TRANSMIT_COUNT * \
 		       (CONFIG_BT_MESH_NETWORK_TRANSMIT_INTERVAL + 10))
 
-static int model1_init(struct bt_mesh_model *model);
-static int model2_init(struct bt_mesh_model *model);
-static int model3_init(struct bt_mesh_model *model);
-static int model4_init(struct bt_mesh_model *model);
-static int model5_init(struct bt_mesh_model *model);
-static int test_msg_handler(struct bt_mesh_model *model,
+static int model1_init(const struct bt_mesh_model *model);
+static int model2_init(const struct bt_mesh_model *model);
+static int model3_init(const struct bt_mesh_model *model);
+static int model4_init(const struct bt_mesh_model *model);
+static int model5_init(const struct bt_mesh_model *model);
+static int test_msg_handler(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf);
-static int test_msg_ne_handler(struct bt_mesh_model *model,
+static int test_msg_ne_handler(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf);
 
@@ -99,7 +99,7 @@ static const struct {
 static struct k_sem publish_sem;
 static bool publish_allow;
 
-static int model1_update(struct bt_mesh_model *model)
+static int model1_update(const struct bt_mesh_model *model)
 {
 	model->pub->msg->data[1]++;
 
@@ -108,7 +108,7 @@ static int model1_update(struct bt_mesh_model *model)
 	return publish_allow ? k_sem_give(&publish_sem), 0 : -1;
 }
 
-static int test_msgf_handler(struct bt_mesh_model *model,
+static int test_msgf_handler(const struct bt_mesh_model *model,
 			     struct bt_mesh_msg_ctx *ctx,
 			     struct net_buf_simple *buf)
 {
@@ -204,7 +204,7 @@ static const struct bt_mesh_model_op model_ne_op5[] = {
 static struct bt_mesh_cfg_cli cfg_cli;
 
 /* do not change model sequence. it will break pointer arithmetic. */
-static struct bt_mesh_model models[] = {
+static const struct bt_mesh_model models[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_1, model_op1, &model_pub1, NULL, &test_model1_cb),
@@ -215,7 +215,7 @@ static struct bt_mesh_model models[] = {
 };
 
 /* do not change model sequence. it will break pointer arithmetic. */
-static struct bt_mesh_model models_ne[] = {
+static const struct bt_mesh_model models_ne[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_1, model_ne_op1, NULL, NULL, &test_model1_cb),
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_2, model_ne_op2, NULL, NULL, &test_model2_cb),
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_3, model_ne_op3, NULL, NULL, &test_model3_cb),
@@ -223,7 +223,7 @@ static struct bt_mesh_model models_ne[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_5, model_ne_op5, NULL, NULL, &test_model5_cb),
 };
 
-static struct bt_mesh_model vnd_models[] = {};
+static const struct bt_mesh_model vnd_models[] = {};
 
 static struct bt_mesh_elem elems[] = {
 	BT_MESH_ELEM(0, models, vnd_models),
@@ -246,43 +246,43 @@ const struct bt_mesh_comp local_comp = {
  *            m4        mne4
  */
 
-static int model1_init(struct bt_mesh_model *model)
+static int model1_init(const struct bt_mesh_model *model)
 {
 	return 0;
 }
 
-static int model2_init(struct bt_mesh_model *model)
+static int model2_init(const struct bt_mesh_model *model)
 {
 	return 0;
 }
 
-static int model3_init(struct bt_mesh_model *model)
+static int model3_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, model - 2));
 	ASSERT_OK(bt_mesh_model_extend(model, model - 1));
 
-	if (model->elem_idx == 1) {
+	if (*(model->elem_idx) == 1) {
 		ASSERT_OK(bt_mesh_model_extend(model, &models[4]));
 	}
 
 	return 0;
 }
 
-static int model4_init(struct bt_mesh_model *model)
+static int model4_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, model - 1));
 
 	return 0;
 }
 
-static int model5_init(struct bt_mesh_model *model)
+static int model5_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, model - 4));
 
 	return 0;
 }
 
-static int test_msg_handler(struct bt_mesh_model *model,
+static int test_msg_handler(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
@@ -292,7 +292,7 @@ static int test_msg_handler(struct bt_mesh_model *model,
 	return 0;
 }
 
-static int test_msg_ne_handler(struct bt_mesh_model *model,
+static int test_msg_ne_handler(const struct bt_mesh_model *model,
 			struct bt_mesh_msg_ctx *ctx,
 			struct net_buf_simple *buf)
 {
@@ -515,7 +515,7 @@ static void pub_param_set(uint8_t period, uint8_t transmit)
 
 static void msgf_publish(void)
 {
-	struct bt_mesh_model *model = &models[2];
+	const struct bt_mesh_model *model = &models[2];
 
 	bt_mesh_model_msg_init(model->pub->msg, TEST_MESSAGE_OP_F);
 	net_buf_simple_add_u8(model->pub->msg, 1);
@@ -591,7 +591,7 @@ static void recv_jitter_check(int32_t interval, uint8_t count)
  */
 static void test_tx_period(void)
 {
-	struct bt_mesh_model *model = &models[2];
+	const struct bt_mesh_model *model = &models[2];
 
 	bt_mesh_test_cfg_set(NULL, 60);
 	bt_mesh_device_setup(&prov, &local_comp);
@@ -647,7 +647,7 @@ static void test_rx_period(void)
  */
 static void test_tx_transmit(void)
 {
-	struct bt_mesh_model *model = &models[2];
+	const struct bt_mesh_model *model = &models[2];
 	uint8_t status;
 	int err;
 
@@ -719,7 +719,7 @@ static void test_rx_transmit(void)
  */
 static void test_tx_cancel(void)
 {
-	struct bt_mesh_model *model = &models[2];
+	const struct bt_mesh_model *model = &models[2];
 	int err;
 
 	bt_mesh_test_cfg_set(NULL, 20);
diff --git a/tests/bsim/bluetooth/mesh/src/test_blob.c b/tests/bsim/bluetooth/mesh/src/test_blob.c
index e3c564d9739..f9661fa0be0 100644
--- a/tests/bsim/bluetooth/mesh/src/test_blob.c
+++ b/tests/bsim/bluetooth/mesh/src/test_blob.c
@@ -261,7 +261,7 @@ static const struct bt_mesh_comp cli_comp = {
 
 static struct k_sem info_get_sem;
 
-static int mock_handle_info_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_handle_info_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	k_sem_give(&info_get_sem);
@@ -1310,7 +1310,7 @@ static void test_srv_fail_on_block_get(void)
 	PASS();
 }
 
-static int dummy_xfer_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int dummy_xfer_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	return 0;
diff --git a/tests/bsim/bluetooth/mesh/src/test_cdp1.c b/tests/bsim/bluetooth/mesh/src/test_cdp1.c
index 7884ef17437..03b71dce970 100644
--- a/tests/bsim/bluetooth/mesh/src/test_cdp1.c
+++ b/tests/bsim/bluetooth/mesh/src/test_cdp1.c
@@ -29,7 +29,7 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_INF);
 #define TEST_VND_MODEL_ID_1 0x3a3a
 
 #define TEST_MODEL_DECLARE(number)                                                                 \
-	static int model_##number##_init(struct bt_mesh_model *model);                             \
+	static int model_##number##_init(const struct bt_mesh_model *model);			   \
 	static const struct bt_mesh_model_cb test_model_##number##_cb = {                          \
 		.init = model_##number##_init,                                                     \
 	};                                                                                         \
@@ -56,7 +56,7 @@ static const struct bt_mesh_test_cfg node_1_cfg = {
 static struct bt_mesh_prov prov;
 static struct bt_mesh_cfg_cli cfg_cli;
 
-static struct bt_mesh_model models_1[] = {
+static const struct bt_mesh_model models_1[] = {
 	BT_MESH_MODEL_CFG_SRV,
 	BT_MESH_MODEL_CFG_CLI(&cfg_cli),
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_1, model_op_1, NULL, NULL, &test_model_1_cb),
@@ -64,19 +64,19 @@ static struct bt_mesh_model models_1[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_3, model_op_3, NULL, NULL, &test_model_3_cb),
 };
 
-static struct bt_mesh_model models_2[] = {
+static const struct bt_mesh_model models_2[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_4, model_op_4, NULL, NULL, &test_model_4_cb),
 };
 
-static struct bt_mesh_model models_3[] = {
+static const struct bt_mesh_model models_3[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_5, model_op_5, NULL, NULL, &test_model_5_cb),
 };
 
-static struct bt_mesh_model models_4[] = {
+static const struct bt_mesh_model models_4[] = {
 	BT_MESH_MODEL_CB(TEST_MODEL_ID_6, model_op_6, NULL, NULL, &test_model_6_cb),
 };
 
-static struct bt_mesh_model models_vnd1[] = {
+static const struct bt_mesh_model models_vnd1[] = {
 	BT_MESH_MODEL_VND_CB(TEST_VND_COMPANY_ID, TEST_VND_MODEL_ID_1, model_op_vnd1, NULL, NULL,
 			     &test_model_vnd1_cb),
 };
@@ -106,41 +106,41 @@ static const struct bt_mesh_comp comp = {
  * M2 on E0 and M4 on E1 corresponds.
  * M6 on E4 extends M1 on E0
  */
-static int model_1_init(struct bt_mesh_model *model)
+static int model_1_init(const struct bt_mesh_model *model)
 {
 	return 0;
 }
 
-static int model_2_init(struct bt_mesh_model *model)
+static int model_2_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, bt_mesh_model_find(&elems[0], TEST_MODEL_ID_1)));
 	return 0;
 }
 
-static int model_3_init(struct bt_mesh_model *model)
+static int model_3_init(const struct bt_mesh_model *model)
 {
 	return 0;
 }
 
-static int model_4_init(struct bt_mesh_model *model)
+static int model_4_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(bt_mesh_model_find(&elems[0], TEST_MODEL_ID_3), model));
 	ASSERT_OK(bt_mesh_model_correspond(model, bt_mesh_model_find(&elems[0], TEST_MODEL_ID_2)));
 	return 0;
 }
 
-static int model_5_init(struct bt_mesh_model *model)
+static int model_5_init(const struct bt_mesh_model *model)
 {
 	return 0;
 }
 
-static int model_6_init(struct bt_mesh_model *model)
+static int model_6_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, bt_mesh_model_find(&elems[0], TEST_MODEL_ID_1)));
 	return 0;
 }
 
-static int model_vnd1_init(struct bt_mesh_model *model)
+static int model_vnd1_init(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_extend(model, bt_mesh_model_find(&elems[0], TEST_MODEL_ID_1)));
 	ASSERT_OK(bt_mesh_model_correspond(model, bt_mesh_model_find(&elems[0], TEST_MODEL_ID_3)));
diff --git a/tests/bsim/bluetooth/mesh/src/test_dfu.c b/tests/bsim/bluetooth/mesh/src/test_dfu.c
index 0eed5d1478d..83037ea6e73 100644
--- a/tests/bsim/bluetooth/mesh/src/test_dfu.c
+++ b/tests/bsim/bluetooth/mesh/src/test_dfu.c
@@ -1309,7 +1309,7 @@ static void test_cli_stop(void)
 
 static struct k_sem caps_get_sem;
 
-static int mock_handle_caps_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_handle_caps_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	LOG_WRN("Rejecting BLOB Information Get message");
@@ -1340,7 +1340,7 @@ static const struct bt_mesh_comp srv_caps_broken_comp = {
 	.elem_count = 1,
 };
 
-static int mock_handle_chunks(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_handle_chunks(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				struct net_buf_simple *buf)
 {
 	LOG_WRN("Skipping receiving block");
@@ -1373,7 +1373,7 @@ static const struct bt_mesh_comp broken_target_comp = {
 
 static struct k_sem update_get_sem;
 
-static int mock_handle_update_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_handle_update_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				  struct net_buf_simple *buf)
 {
 	LOG_WRN("Rejecting Firmware Update Get message");
@@ -1406,7 +1406,7 @@ static const struct bt_mesh_comp srv_update_get_broken_comp = {
 
 static struct k_sem update_apply_sem;
 
-static int mock_handle_update_apply(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_handle_update_apply(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 				    struct net_buf_simple *buf)
 {
 	LOG_WRN("Rejecting Firmware Update Apply message");
diff --git a/tests/bsim/bluetooth/mesh/src/test_lcd.c b/tests/bsim/bluetooth/mesh/src/test_lcd.c
index c4b64447987..7e1d9ffca3c 100644
--- a/tests/bsim/bluetooth/mesh/src/test_lcd.c
+++ b/tests/bsim/bluetooth/mesh/src/test_lcd.c
@@ -31,9 +31,19 @@ LOG_MODULE_REGISTER(test_lcd, LOG_LEVEL_INF);
 	 LCD_STATUS_FIELDS_LEN -                                                                   \
 	 BT_MESH_MIC_SHORT) /* 378 bytes */
 
+#ifdef CONFIG_BT_MESH_MODEL_EXTENSIONS
+#define BT_MESH_MODEL_NEXT_UNASSIGNED()				\
+	.next = (const struct bt_mesh_model *[]){ NULL },
+#else
+#define BT_MESH_MODEL_NEXT_UNASSIGNED()
+#endif
+
 #define TEST_MODEL_CNT_CB(_dummy_op, _metadata) \
 {                                               \
 	.id = 0x1234,                               \
+	.elem_idx = (uint8_t []) { 0 },		    \
+	.mod_idx = (uint8_t []) { 0 },		    \
+	.flags = (uint16_t []) { 0 },		    \
 	.pub = NULL,                                \
 	.keys = NULL,                               \
 	.keys_cnt = 0,                              \
@@ -41,7 +51,8 @@ LOG_MODULE_REGISTER(test_lcd, LOG_LEVEL_INF);
 	.groups_cnt = 0,                            \
 	.op = _dummy_op,                            \
 	.cb = NULL,                                 \
-	.user_data = NULL,                          \
+	BT_MESH_MODEL_NEXT_UNASSIGNED()		    \
+	.user_data = (void *[]){ NULL },	    \
 	.metadata = _metadata,                      \
 }
 
diff --git a/tests/bsim/bluetooth/mesh/src/test_op_agg.c b/tests/bsim/bluetooth/mesh/src/test_op_agg.c
index d8bb50b3fd3..8735bdf524d 100644
--- a/tests/bsim/bluetooth/mesh/src/test_op_agg.c
+++ b/tests/bsim/bluetooth/mesh/src/test_op_agg.c
@@ -54,7 +54,7 @@ static uint8_t cli_sent_array[TEST_SEND_ITR], cli_rcvd_array[TEST_SEND_ITR];
 static struct bt_mesh_prov prov;
 static struct bt_mesh_cfg_cli cfg_cli;
 
-static int get_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int get_handler(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	uint8_t seq = net_buf_simple_pull_u8(buf);
@@ -78,7 +78,7 @@ static int get_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return bt_mesh_model_send(model, ctx, &msg, NULL, NULL);
 }
 
-static int status_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int status_handler(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
 	uint8_t seq = net_buf_simple_pull_u8(buf);
@@ -93,7 +93,8 @@ static int status_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *c
 	return 0;
 }
 
-static int dummy_vnd_mod_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx, uint8_t seq)
+static int dummy_vnd_mod_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+			     uint8_t seq)
 {
 	BT_MESH_MODEL_BUF_DEFINE(msg, BT_MESH_DUMMY_VND_MOD_GET_OP,
 				 BT_MESH_DUMMY_VND_MOD_MSG_MAXLEN);
diff --git a/tests/bsim/bluetooth/mesh/src/test_persistence.c b/tests/bsim/bluetooth/mesh/src/test_persistence.c
index 17244be15fe..df3eaa19989 100644
--- a/tests/bsim/bluetooth/mesh/src/test_persistence.c
+++ b/tests/bsim/bluetooth/mesh/src/test_persistence.c
@@ -338,7 +338,7 @@ static void check_mod_pub_params(const struct bt_mesh_cfg_cli_mod_pub *expected,
 	ASSERT_EQUAL(expected->transmit, got->transmit);
 }
 
-int test_model_settings_set(struct bt_mesh_model *model,
+int test_model_settings_set(const struct bt_mesh_model *model,
 			    const char *name, size_t len_rd,
 			    settings_read_cb read_cb, void *cb_arg)
 {
@@ -364,12 +364,12 @@ int test_model_settings_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-void test_model_reset(struct bt_mesh_model *model)
+void test_model_reset(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_data_store(test_model, false, TEST_MOD_DATA_NAME, NULL, 0));
 }
 
-int test_vnd_model_settings_set(struct bt_mesh_model *model,
+int test_vnd_model_settings_set(const struct bt_mesh_model *model,
 				const char *name, size_t len_rd,
 				settings_read_cb read_cb, void *cb_arg)
 {
@@ -395,7 +395,7 @@ int test_vnd_model_settings_set(struct bt_mesh_model *model,
 	return 0;
 }
 
-void test_vnd_model_reset(struct bt_mesh_model *model)
+void test_vnd_model_reset(const struct bt_mesh_model *model)
 {
 	ASSERT_OK(bt_mesh_model_data_store(test_vnd_model, true, TEST_VND_MOD_DATA_NAME, NULL, 0));
 }
diff --git a/tests/bsim/bluetooth/mesh/src/test_provision.c b/tests/bsim/bluetooth/mesh/src/test_provision.c
index 24e1f627382..80eb9ff38cd 100644
--- a/tests/bsim/bluetooth/mesh/src/test_provision.c
+++ b/tests/bsim/bluetooth/mesh/src/test_provision.c
@@ -152,7 +152,7 @@ static const struct bt_mesh_comp rpr_cli_srv_comp = {
 	.elem_count = 1,
 };
 
-static int mock_pdu_send(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int mock_pdu_send(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			       struct net_buf_simple *buf)
 {
 	/* Device becomes unresponsive and doesn't communicate with other nodes anymore */
@@ -168,10 +168,10 @@ static const struct bt_mesh_model_op model_rpr_op1[] = {
 	BT_MESH_MODEL_OP_END
 };
 
-static int mock_model_init(struct bt_mesh_model *mod)
+static int mock_model_init(const struct bt_mesh_model *mod)
 {
 	mod->keys[0] = BT_MESH_KEY_DEV_LOCAL;
-	mod->flags |= BT_MESH_MOD_DEVKEY_ONLY;
+	*(mod->flags) |= BT_MESH_MOD_DEVKEY_ONLY;
 
 	return 0;
 }
diff --git a/tests/bsim/bluetooth/mesh/src/test_sar.c b/tests/bsim/bluetooth/mesh/src/test_sar.c
index a928d973a25..7214366247d 100644
--- a/tests/bsim/bluetooth/mesh/src/test_sar.c
+++ b/tests/bsim/bluetooth/mesh/src/test_sar.c
@@ -91,7 +91,7 @@ static void data_integrity_check(struct net_buf_simple *buf)
 	net_buf_simple_restore(buf, &state);
 }
 
-static int get_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int get_handler(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 		       struct net_buf_simple *buf)
 {
 	data_integrity_check(buf);
@@ -104,7 +104,7 @@ static int get_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 	return bt_mesh_model_send(model, ctx, &msg, NULL, NULL);
 }
 
-static int status_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int status_handler(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			  struct net_buf_simple *buf)
 {
 	data_integrity_check(buf);
@@ -112,7 +112,7 @@ static int status_handler(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *c
 	return 0;
 }
 
-static int dummy_vnd_mod_get(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
+static int dummy_vnd_mod_get(const struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx,
 			     uint8_t msg[])
 {
 	BT_MESH_MODEL_BUF_DEFINE(buf, DUMMY_VND_MOD_GET_OP, MAX_SDU_MSG_LEN);
@@ -185,7 +185,7 @@ static void array_random_fill(uint8_t array[], uint16_t len, int seed)
 static void cli_max_len_sdu_send(struct bt_mesh_sar_rx *sar_rx_config,
 				 struct bt_mesh_sar_tx *sar_tx_config)
 {
-	struct bt_mesh_model *dummy_vnd_mod = &elements[0].vnd_models[0];
+	const struct bt_mesh_model *dummy_vnd_mod = &elements[0].vnd_models[0];
 
 	bt_mesh_test_cfg_set(NULL, WAIT_TIME);
 	bt_mesh_device_setup(&prov, &comp);