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esp_ble_gattc_read_char_descr() function
Read a characteristics descriptor
Syntax
esp_err_t esp_ble_gattc_read_char_descr (esp_gatt_if_t gattc_if,
uint16_t conn_id,
uint16_t handle,
esp_gatt_auth_req_t auth_req);
Implemented in ![]()
esp_gattc_api.c:587
Return value
- ESP_OK: Success - ESP_ERR_INVALID_STATE: The connection has not been established. - ESP_GATT_INVALID_HANDLE：Invalid `handle` - ESP_FAIL: Failure due to other reasons
Notes
1. This function triggers `ESP_GATTC_READ_DESCR_EVT`. 2. This function should be called only after the connection has been established. 3. `handle` must be greater than 0.