Function esp_idf_hal::sys::esp_mqtt_client_register_event

pub unsafe extern "C" fn esp_mqtt_client_register_event(
    client: *mut esp_mqtt_client,
    event: i32,
    event_handler: Option<unsafe extern "C" fn(_: *mut c_void, _: *const i8, _: i32, _: *mut c_void)>,
    event_handler_arg: *mut c_void
) -> i32

@brief Registers MQTT event

@param client MQTT client handle @param event event type @param event_handler handler callback @param event_handler_arg handlers context

@return ESP_ERR_NO_MEM if failed to allocate ESP_ERR_INVALID_ARG on wrong initialization ESP_OK on success