Auto discovery deactivation at runtime by MQTT command (#856)

and switch automatic creation for it in HASS (by autodiscovery :-)

main/ZmqttDiscovery.ino

@@ -292,6 +292,14 @@ void pubMqttDiscovery() {
                   Gateway_AnnouncementMsg, will_Message, true, subjectMQTTtoSYSset, //set,payload_avalaible,payload_not avalaible   ,is a gateway entity, command topic
                   "", "", "", "" // device name, device manufacturer, device model, device mac
   );
+  createDiscovery("switch", //set Type
+                  "", "SYS: Auto discovery", (char*)getUniqueId("discovery", "").c_str(), //set state_topic,name,uniqueId
+                  will_Topic, "", "", //set availability_topic,device_class,value_template,
+                  "{\"discovery\":true}", "{\"discovery\":false}", "", //set,payload_on,payload_off,unit_of_meas,
+                  0, //set  off_delay
+                  Gateway_AnnouncementMsg, will_Message, true, subjectMQTTtoSYSset, //set,payload_avalaible,payload_not avalaible   ,is a gateway entity, command topic
+                  "", "", "", "" // device name, device manufacturer, device model, device mac
+  );
 
 #  ifdef ZsensorBME280
 #    define BMEparametersCount 5