mqtt test (experimental)

include/mqttclient.h

@@ -17,7 +17,7 @@ extern TaskHandle_t mqttTask;
 void mqtt_enqueuedata(MessageBuffer_t *message);
 void mqtt_queuereset(void);
 void mqtt_client_task(void *param);
-int mqtt_connect(IPAddress mqtt_host, uint16_t mqtt_port);
+int mqtt_connect(const char *my_host, const uint16_t my_port);
 void mqtt_callback(char *topic, byte *payload, unsigned int length);
 void NetworkEvent(WiFiEvent_t event);
 esp_err_t mqtt_init(void);