Index: sources/cloudsync/CloudSyncController.h
===================================================================
diff -u -re2dc7bd9995a3bb410aa472a1f95c1cc9ba3136d -r80250cfdbe58a3df17950d342212f155d52d3971
--- sources/cloudsync/CloudSyncController.h	(.../CloudSyncController.h)	(revision e2dc7bd9995a3bb410aa472a1f95c1cc9ba3136d)
+++ sources/cloudsync/CloudSyncController.h	(.../CloudSyncController.h)	(revision 80250cfdbe58a3df17950d342212f155d52d3971)
@@ -55,6 +55,7 @@
     QString         _date_out_File  = ""; // The dated/actual filename : CloudSync     puts its output                        to this file
     QString         _date_inp_File  = ""; // The dated/actual filename : UI Software   puts the  input data for the CloudSync in this file
     QDateTime       _datetime           ;
+    qint64          _secSinceEpoch      ;
 
     QString         _dateFormatted      ;
     QString         _timeFormatted      ;
@@ -65,8 +66,60 @@
     const char      _dateSeparator  = '_'; // used in filename
     const char      _separator      = ',';
 
-    quint64         _seq            = 0;
+    quint64         _seq            =   0;
 
+    enum Errors_Enum {
+        eError_OK           ,
+        eError_Count        ,
+        eError_Timestamp    ,
+        eError_Sequence     ,
+        eError_MessageID    ,
+        eError_ParamCount   ,
+        eError_CRC          ,
+        eError_Parameter    ,
+
+        eError_NoHistory    ,
+
+        eError_LogFolder    ,
+        eError_LogFileInp   ,
+    };
+
+    typedef QHash<qint32 , QStringList> MessageList;
+    MessageList     _lastReceivedData   ; // sent message history for later send upon request.
+
+    enum Message_Enum {
+        eMessage_Timestamp  ,
+        eMessage_Sequence   ,
+        eMessage_MessageID  ,
+        eMessage_ParamCount ,
+        eMessage_CRC        ,
+        eMessage_Count      ,
+    };
+
+    typedef QStringList Params;
+    struct Message {
+        qint64  timestamp   = 0;
+        quint32 sequence    = 0;
+        qint32  id          = 0;
+        qint64  paramCount  = 0;
+        quint8  crc         = 0;
+        Params  params      { };
+    };
+
+    enum MessageID_Enum {
+        eMessageID_DeviceInfo       = 101, // CS asks for device info       and UI sends back
+        eMessageID_WriteCredentials = 102, // CS asks to  store credential  and UI stores/confirms
+        eMessageID_ReadCredentials  = 103, // CS asks for credentials       and UI reads/sends
+        eMessageID_ResetFactory     = 104, // CS asks for factory reset     [no UI ack back yet]
+
+        eMessageID_DeviceState      = 201, // CS asks for device state      and UI finds the history/sends
+        eMessageID_PatientID        = 202, // [No CS req defined]               UI sends the patient ID
+        eMessageID_TxReport         = 203, // [No CS req defined]               UI sends the Tx report
+        eMessageID_DeviceReport     = 204, // [No CS req defined]               UI sends the device report
+
+        eMessageID_HeartBeat        = 900, // CS sends the periodic Hb      and UI can set the interval
+    };
+
 protected:
     void timerEvent(QTimerEvent *event) override;
 
@@ -86,8 +139,14 @@
     void initThread(QThread &vThread);
     void quitThread();
 
-    void checkDate();
-    void addCSBuffWatch();
-    bool interpreter(const QString &vContent); // this function may later need to be a class.
-    bool sendUIBuff (const QString &vData);
+    void checkDate          ();
+    bool addCSBuffWatch();
+    bool sendUIResponse     (const QString &vContent);
+    bool sendUIBuff         (const QString &vData);
+    bool sendUIHistory      (qint32 vAction);
+    bool interpret(const QString &vContent, Message &vMessage);
+
+    QString toText  (Errors_Enum vErrorID);
+    QString toInfo  (Errors_Enum vErrorID, const QVariantList &vInfoItems);
+    void    toLog   (Errors_Enum vErrorID, const QVariantList &vInfoItems);
 };