Index: sources/cloudsync/CloudSyncController.h
===================================================================
diff -u -r15dffa44e42fe108caa6dd0dfbe659b192ee5323 -r1bf8c894c5cc5ea6d62af0662fcf5a18e1a06459
--- sources/cloudsync/CloudSyncController.h	(.../CloudSyncController.h)	(revision 15dffa44e42fe108caa6dd0dfbe659b192ee5323)
+++ sources/cloudsync/CloudSyncController.h	(.../CloudSyncController.h)	(revision 1bf8c894c5cc5ea6d62af0662fcf5a18e1a06459)
@@ -74,6 +74,10 @@
     QString         _deviceInfoDG   =  "";
     QString         _deviceInfoUI   =  "";
 
+    const quint8    _checkinIntervalSend    =    60; // count down for check-in error if not responded back - regarding the _interval it will be 60s
+    const quint8    _checkinIntervalTest    =     5; // count down for check-in error if not responded back - regarding the _interval it will be  5s
+    bool            _checkinRcvd            = false; // id check-in received will set to true.
+
     bool            _postPass       = false;
 
     enum Errors_Enum {
@@ -161,7 +165,7 @@
         eMessageID_DeviceRegister   =   1,  // [ UI(1001)  -> CS(    ) ] Device Registration Request
         eMessageID_DeviceInfo       =   2,  // [ CS(2002) <-> UI(1002) ] Device information  Request
         eMessageID_CredentialsSave  =   3,  // [ CS(2003) <-> UI(1003) ] Save   Credentials  Request/Response
-        //// Not Used                   4,
+        eMessageID_CheckIn          =   4,  // [ CS(2004) <-> UI(1004) ] CheckIn/HeartBeat   Request/Response
         eMessageID_UIFactoryReset   =   5,  // [ CS(2005) <-> UI(1005) ] Factory Reset       Request
         // Deployment
         eMessageID_DeviceState      =   6,  // [ CS(2006) <-> UI(1006) ] Device State        Request
@@ -222,6 +226,7 @@
     void didRegisterStart   (bool           vOK    );
     void didRegisterDone    (bool           vOK    );
     void didCloudSyncStatus (bool           vReady );
+    void didCheckInReceive  ();
 
 private:
     void initConnections();
@@ -289,6 +294,11 @@
     bool sendCredentialsSave    (const Message &vMessage    ); // eMessageID_SaveCredentials
     bool sendCredentialsResponse();
 
+    // check-in
+    bool sendCheckIn            ();
+    void testCheckIn            ();
+    bool takeCheckIn            ();
+
     // pending log
     void sendPendingLog         ( const QString &vFileName  ); // eMessageID_TxReport
     bool sendTxCodeDisplay      ( const Message &vMessage   ); // eMessageID_TxCodeDisplay