gatt_client_read_long_value_of_characteristic() function
Reads the long characteristic value using the characteristic's value handle. The value will be returned in several blobs. For each blob, a GATT_EVENT_LONG_CHARACTERISTIC_VALUE_QUERY_RESULT event with updated value offset will be emitted. The GATT_EVENT_QUERY_COMPLETE event marks the end of read.
Return value
status BTSTACK_MEMORY_ALLOC_FAILED, if no GATT client for con_handle is found GATT_CLIENT_IN_WRONG_STATE , if GATT client is not ready ERROR_CODE_SUCCESS , if query is successfully registered