diff --git a/MQTTInterface.cpp b/MQTTInterface.cpp
index d5fed9c..f93546a 100644
--- a/MQTTInterface.cpp
+++ b/MQTTInterface.cpp
@@ -50,8 +50,39 @@ void cantorDecode(int32_t c, int *a, int *b)
     *a = w - *b;
 }
 
+/**
+ * @brief callback used from DIAG to send diag messages to the broker / clients
+ * 
+ * @param msg 
+ * @param length 
+ */
+void mqttDiag(const char *msg, const int length)
+{
+
+    if (MQTTInterface::get()->getState() == CONNECTED)
+    {
+        // if not connected all goes only to Serial;
+        // if CONNECTED we have at least the root topic subscribed to
+        auto mqSocket = MQTTInterface::get()->getActive();
+        char topic[MAXTSTR];
+        memset(topic, 0, MAXTSTR);
+
+        if (mqSocket == 0)
+        { // send to root topic of the commandstation as it doen't concern a specific client at this point
+            sprintf(topic, "%s", MQTTInterface::get()->getClientID());
+        }
+        else
+        {
+            sprintf(topic, "%s/%ld/diag", MQTTInterface::get()->getClientID(), MQTTInterface::get()->getClients()[mqSocket].topic);
+        }
+        // Serial.print(" ---- MQTT pub to: "); Serial.print(topic); Serial.print(" Msg: "); Serial.print(msg);
+        MQTTInterface::get()->publish(topic, msg);
+    }
+}
+
 void MQTTInterface::setup()
 {
+    StringLogger::get().addDiagWriter(mqttDiag);
     singleton = new MQTTInterface();
 
     if (!singleton->connected)
@@ -97,6 +128,7 @@ void mqttCallback(char *topic, byte *payload, unsigned int length)
     {
     case '<':   // Recieved a DCC-EX Command
     {
+        if (payload[1] == '*') { return;} // it's a bounced diag message
         const char s[2] = "/"; // topic delimiter is /
         char *token;
         byte mqsocket;
@@ -538,8 +570,22 @@ void MQTTInterface::loop()
 
 
 bool showonce = false;
+auto s = millis();
+void loopPing(int interval)
+{
+    auto c = millis();
+    if (c - s > 2000)
+    {
+        DIAG(F("loop alive")); // ping every 2 sec
+        s = c;
+    }
+}
+
+
 void MQTTInterface::loop2()
 {
+ 
+    loopPing(2000); // ping every 2 sec
     // Connection impossible so just don't do anything
     if (singleton->mqState == CONNECTION_FAILED)
     {
diff --git a/MQTTInterface.h b/MQTTInterface.h
index 4b980a1..e6f5db2 100644
--- a/MQTTInterface.h
+++ b/MQTTInterface.h
@@ -178,34 +178,33 @@ private:
     char                    clientID[(CLIENTIDSIZE * 2) + 1];   // unique ID of the commandstation; not to confused with the connectionID
     csmqttclient_t          clients[MAXMQTTCONNECTIONS];        // array of connected mqtt clients
     char                    connectID[MAXCONNECTID];            // clientId plus possible prefix if required by the broker
-    uint8_t                 subscriberid = 0;                   // id assigned to a mqtt client when recieving the inital handshake; +1 at each connection
+    byte                    subscriberid = 0;                   // id assigned to a mqtt client when recieving the inital handshake; +1 at each connection
+    byte                    activeSubscriber = 0;               // if its 0 no active Subscriber; set as soon as we recieve a command of go into processing on the CS
 
     bool                    connected = false;  // set to true if the ethernet connection is available
     MQTTInterfaceState      mqState = INIT;     // Status of the MQBroker connection
     RingStream             *outboundRing;       // Buffer for collecting the results from the command parser
     PubSubClient           *mqttClient;         // PubSub Endpoint for data exchange
 
+
 public:
-    static MQTTInterface *get() noexcept
-    {
-        return singleton;
-    }
+    static MQTTInterface              *get() noexcept           { return singleton;}
 
-    boolean subscribe(const char *topic);
+    boolean                            subscribe(const char *topic);
+    void                               publish(const char *topic, const char *payload);
 
-    void publish(const char *topic, const char *payload);
-
-    ObjectPool<csmsg_t, MAXPOOLSIZE> *getPool() { return &pool; };
-    Queue<int> *getIncomming() { return &in; };
-    Queue<int> *getSubscriptionQueue() { return &subscriberQueue; };
-
-    char *getClientID() { return clientID; };
-    uint8_t getClientSize() { return subscriberid; }
+    ObjectPool<csmsg_t, MAXPOOLSIZE>  *getPool()                { return &pool; };
+    Queue<int>                        *getIncomming()           { return &in; };
+    Queue<int>                        *getSubscriptionQueue()   { return &subscriberQueue; };
+    MQTTInterfaceState                 getState()               { return mqState; };
+    byte                               getActive()              { return activeSubscriber; };
+    void                               setActive(byte mqSocket) { activeSubscriber = mqSocket; };
+    char                              *getClientID()            { return clientID; };
+    uint8_t                            getClientSize()          { return subscriberid; };
 
     // initalized to 0 so that the first id comming back is 1
     // index 0 in the clients array is not used therefore
-    //! improvement here to be done to save some bytes
-    
+
     uint8_t obtainSubscriberID()
     {
         if (subscriberid == MAXMQTTCONNECTIONS)
@@ -216,7 +215,7 @@ public:
     }
 
     csmqttclient_t *getClients() { return clients; };
-    RingStream *getRingStream() { return outboundRing; }; // debug only
+    RingStream *getRingStream() { return outboundRing; }; 
 
     static void setup();
     static void loop();
@@ -224,4 +223,5 @@ public:
     ~MQTTInterface() = default;
 };
 
+
 #endif
\ No newline at end of file