diff --git a/include/bluetooth/direction.h b/include/bluetooth/direction.h
new file mode 100644
index 00000000000..cf1e0cbaf0f
--- /dev/null
+++ b/include/bluetooth/direction.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_BLUETOOTH_DF_H_
+#define ZEPHYR_INCLUDE_BLUETOOTH_DF_H_
+
+/** @brief Constant Tone Extension parameters for connectionless
+ * transmission.
+ *
+ * The structure holds information required to setup CTE transmission
+ * in periodic advertising.
+ */
+struct bt_df_adv_cte_tx_param {
+	/** Length of CTE in 8us units */
+	uint8_t  cte_len;
+	/** CTE Type: AoA, AoD 1us slots, AoD 2us slots */
+	uint8_t  cte_type;
+	/** Number of CTE to transmit in each periodic adv interval */
+	uint8_t  cte_count;
+	/** Number of Antenna IDs in the switch pattern */
+	uint8_t  num_ant_ids;
+	/** List of antenna IDs in the pattern */
+	uint8_t  *ant_ids;
+};
+
+/** @brief Set or update the Constant Tone Extension parameters for periodic
+ * advertising set.
+ *
+ * @param[in] adv               Advertising set object.
+ * @param[in] params            Constant Tone Extension parameters.
+ *
+ * @return Zero on success or (negative) error code otherwise.
+ */
+int bt_df_set_adv_cte_tx_param(struct bt_le_ext_adv *adv,
+			       const struct bt_df_adv_cte_tx_param *params);
+
+#endif /* ZEPHYR_INCLUDE_BLUETOOTH_DF_H_ */
diff --git a/subsys/bluetooth/host/direction.c b/subsys/bluetooth/host/direction.c
index ae3884abbb4..6724b78114a 100644
--- a/subsys/bluetooth/host/direction.c
+++ b/subsys/bluetooth/host/direction.c
@@ -9,11 +9,11 @@
 #include <bluetooth/hci.h>
 #include <bluetooth/l2cap.h>
 #include <bluetooth/conn.h>
+#include <bluetooth/direction.h>
 #include <sys/byteorder.h>
 
 #include "hci_core.h"
 #include "conn_internal.h"
-#include "direction.h"
 #include "direction_internal.h"
 
 #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_DF)
@@ -44,7 +44,7 @@ static struct bt_le_df_ant_info df_ant_info;
 						BT_HCI_LE_1US_AOA_RX))
 
 static int hci_df_set_cl_cte_tx_params(const struct bt_le_ext_adv *adv,
-				const struct bt_le_df_adv_cte_tx_params *params)
+				    const struct bt_df_adv_cte_tx_param *params)
 {
 	struct bt_hci_cp_le_set_cl_cte_tx_params *cp;
 	struct net_buf *buf;
@@ -250,3 +250,30 @@ int le_df_init(void)
 	BT_DBG("DF initialized.");
 	return 0;
 }
+
+int bt_df_set_adv_cte_tx_param(struct bt_le_ext_adv *adv,
+				const struct bt_df_adv_cte_tx_param *params)
+{
+	__ASSERT_NO_MSG(adv);
+	__ASSERT_NO_MSG(params);
+
+	int err;
+
+	if (!BT_FEAT_LE_CONNECTIONLESS_CTE_TX(bt_dev.le.features)) {
+		return -ENOTSUP;
+	}
+
+	/* Check if BT_ADV_PARAMS_SET is set, because it implies the set
+	 * has already been created.
+	 */
+	if (!atomic_test_bit(adv->flags, BT_ADV_PARAMS_SET)) {
+		return -EINVAL;
+	}
+
+	err = hci_df_set_cl_cte_tx_params(adv, params);
+	if (err) {
+		return err;
+	}
+
+	return 0;
+}
diff --git a/subsys/bluetooth/host/direction.h b/subsys/bluetooth/host/direction.h
deleted file mode 100644
index 9637c417178..00000000000
--- a/subsys/bluetooth/host/direction.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (c) 2020 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#ifndef ZEPHYR_SUBSYS_BLUETOOTH_HOST_DF_H_
-#define ZEPHYR_SUBSYS_BLUETOOTH_HOST_DF_H_
-
-/* @brief Optional switching and sampling rates for Angle of Departure
- * and Angle or Arrival modes.
- */
-enum bt_df_opt_swich_sample_rates {
-	/* Support Angle of Departure 1us switching TX */
-	DF_AOD_1US_SWITCH_TX_SUPP = BIT(0),
-	/* Support Angle of departure 1us sampling RX */
-	DF_AOD_1US_SAMPL_RX_SUPP = BIT(1),
-	/* Support Angle of Arrival 1us switching and sampling RX */
-	DF_AOA_1US_SWITCH_SAMPL_RX_SUPP  = BIT(2),
-};
-
-/* @brief Constant Tone Extension parameters for connectionless
- * transmission.
- *
- * The structure holds information required to setup CTE transmission
- * in periodic advertising.
- */
-struct bt_le_df_adv_cte_tx_params {
-	/* Length of CTE in 8us units */
-	uint8_t  cte_len;
-	/* CTE Type: AoA, AoD 1us slots, AoD 2us slots */
-	uint8_t  cte_type;
-	/* Number of CTE to transmit in each periodic adv interval */
-	uint8_t  cte_count;
-	/* Number of Antenna IDs in the switch pattern */
-	uint8_t  num_ant_ids;
-	/* List of antenna IDs in the pattern */
-	uint8_t  *ant_ids;
-};
-#endif /* ZEPHYR_SUBSYS_BLUETOOTH_HOST_DF_H_ */