Improve MQTT connection handling (#1462)

* modify mqtt init at startup + after disconnection

* mqtt_init only when not initialized

* Minor udapte

* Apply suggestions from code review

Co-authored-by: CaCO3 <caco3@ruinelli.ch>

* Correct typo

Co-authored-by: CaCO3 <caco3@ruinelli.ch>

code/components/jomjol_tfliteclass/server_tflite.cpp

@@ -103,6 +103,8 @@ void doInit(void)
 #ifdef DEBUG_DETAIL_ON      
     ESP_LOGD(TAG, "Finished tfliteflow.InitFlow(config);");
 #endif
+    
+    tfliteflow.StartMQTTService();
 }