#pragma once #include typedef void (*mqtt_connect_handler)( esp_mqtt_client_handle_t, void* ); typedef void (*mqtt_message_handler)( esp_mqtt_client_handle_t, esp_mqtt_event_handle_t, void* ); esp_mqtt_client_handle_t start_mqtt_client( mqtt_connect_handler, mqtt_message_handler, void* ); void stop_mqtt_client(esp_mqtt_client_handle_t);