Index: sources/canbus/frameinterface.h
===================================================================
diff -u -r805119c460b4a266d6401c8705f4427e7fbe270f -rbb8f39a014644c70b832dd2a784f62fa9f6b6106
--- sources/canbus/frameinterface.h	(.../frameinterface.h)	(revision 805119c460b4a266d6401c8705f4427e7fbe270f)
+++ sources/canbus/frameinterface.h	(.../frameinterface.h)	(revision bb8f39a014644c70b832dd2a784f62fa9f6b6106)
@@ -60,9 +60,30 @@
     QThread *_thread = nullptr;
     bool     _init   = false;
 
+
+    struct Frame {
+         Can_Id     can_Id;
+         QByteArray data  ;
+
+         Frame(Can_Id vCan_Id, const QByteArray &vData) {
+             can_Id = vCan_Id;
+             data   = vData  ;
+         }
+     };
+     QList<Frame>  _txFrameList;
+     const quint16 _txFrameList_Max = 4000; // maximum number of frames in the transmit buffer
+     bool _transmitted = false;
+
+     const quint8 _interval = 7; // keep awake call of the UI board in ms
+
+     QString _timestamp;
+
 // Singleton
 SINGLETON(FrameInterface)
 
+protected:
+    void timerEvent(QTimerEvent *);
+
 public slots:
     bool init();
     bool init(QThread &vThread);
@@ -76,12 +97,16 @@
     void initThread(QThread &vThread);
     void quitThread();
 
-    void transmitFrame(Can_Id vCan_Id, const QByteArray &vData = 0);
     ChannelGroup checkChannel(quint32 vFrameId, bool *vOK = nullptr);
+    void transmitFrame  (Can_Id vCan_Id, const QByteArray &vData = 0);
+    void appendHead     (Can_Id vCan_Id, const QByteArray &vData    );
+    void trnsmtHead     ();
+    void removeHead     ();
 
 private slots: // Should be private for thread safety and is connected internally.
     void  onFrameTransmit(Can_Id vCan_Id, const QByteArray   &vData   ); // GUI => CAN
     void  onFrameReceive (                const QCanBusFrame &vFrame  ); // GUI <= CAN
+    void  onFrameWritten (qint64 vCount                               ); // GUI <= CAN
 
 signals:
     /*!