Bluetooth: GATT: Add bt_gatt_read
This adds bt_gatt_read which can used to read attribute values. Note: Attributes which values are bigger than the MTU need to be read multiple time until the end since the stack cannot cache any data. Change-Id: I09c502eeb674a577673182c35a0e1a84519fd3b7 Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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2 changed files with 88 additions and 0 deletions
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@ -709,6 +709,28 @@ int bt_gatt_discover_characteristic(struct bt_conn *conn,
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int bt_gatt_discover_descriptor(struct bt_conn *conn,
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struct bt_gatt_discover_params *params);
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/** @brief Read callback function
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*
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* @param conn Connection object.
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* @param err Error code.
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* @param data Attribute value data.
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* @param length Attribute value length.
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*/
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typedef void (*bt_gatt_read_func_t)(struct bt_conn *conn, int err,
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const void *data, uint16_t length);
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/** @brief Read Attribute Value by handle
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*
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* This procedure read the attribute value and return it to the callback.
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*
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* @param conn Connection object.
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* @param handle Attribute handle.
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* @param offset Attribute data offset.
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* @param func Callback function.
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*/
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int bt_gatt_read(struct bt_conn *conn, uint16_t handle, uint16_t offset,
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bt_gatt_read_func_t func);
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/** @brief Cancel GATT pending request
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*
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* @param conn Connection object.
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@ -850,6 +850,72 @@ int bt_gatt_discover_descriptor(struct bt_conn *conn,
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return 0;
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}
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static void att_read_rsp(struct bt_conn *conn, uint8_t err, const void *pdu,
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uint16_t length, void *user_data)
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{
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bt_gatt_read_func_t func = user_data;
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BT_DBG("err 0x%02x\n", err);
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if (err) {
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func(conn, err, NULL, 0);
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return;
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}
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func(conn, 0, pdu, length);
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}
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static int gatt_read_blob(struct bt_conn *conn, uint16_t handle,
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uint16_t offset, bt_gatt_read_func_t func)
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{
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struct bt_buf *buf;
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struct bt_att_read_blob_req *req;
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buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_BLOB_REQ, sizeof(*req));
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if (!buf) {
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return -ENOMEM;
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}
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req = bt_buf_add(buf, sizeof(*req));
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req->handle = sys_cpu_to_le16(handle);
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req->offset = sys_cpu_to_le16(offset);
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BT_DBG("handle 0x%04x offset 0x%04x\n", handle, offset);
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bt_att_send(conn, buf, att_read_rsp, func, NULL);
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return 0;
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}
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int bt_gatt_read(struct bt_conn *conn, uint16_t handle, uint16_t offset,
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bt_gatt_read_func_t func)
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{
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struct bt_buf *buf;
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struct bt_att_read_req *req;
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if (!conn || !handle || !func) {
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return -EINVAL;
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}
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if (offset) {
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return gatt_read_blob(conn, handle, offset, func);
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}
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buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_REQ, sizeof(*req));
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if (!buf) {
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return -ENOMEM;
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}
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req = bt_buf_add(buf, sizeof(*req));
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req->handle = sys_cpu_to_le16(handle);
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BT_DBG("handle 0x%04x\n", handle);
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bt_att_send(conn, buf, att_read_rsp, func, NULL);
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return 0;
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}
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void bt_gatt_cancel(struct bt_conn *conn)
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{
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bt_att_cancel(conn);
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