MQTT improvements (#1302)

* Update server_mqtt.cpp

* Update server_mqtt.cpp

* skipp all MQTT publishing until the next round if an error occures

* improve logging

* only use group for uid and topic if there is more than one number

* .

* .

code/components/jomjol_tfliteclass/server_tflite.h

@@ -17,6 +17,8 @@ bool isSetupModusActive();
 
 std::string GetMQTTMainTopic();
 
+int getCountFlowRounds();
+
 esp_err_t GetJPG(std::string _filename, httpd_req_t *req);
 
 esp_err_t GetRawJPG(httpd_req_t *req);