Index: sources/canbus/MessageDispatcher.cpp
===================================================================
diff -u -rf734248435a849bf26d13f6e78d0ad4c1002d019 -r61f16c988a159401c92730b4cbfca5085c77222f
--- sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision f734248435a849bf26d13f6e78d0ad4c1002d019)
+++ sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision 61f16c988a159401c92730b4cbfca5085c77222f)
@@ -45,7 +45,7 @@
     if ( _init ) return false;
     _init = true;
 
-    // runs in DriveWatcher thread
+    // runs in the thread
     initConnections();
 
     LOG_DEBUG("UI," + tr("%1 Initialized").arg(metaObject()->className()));
@@ -789,6 +789,49 @@
     return true;
 }
 
+bool MessageDispatcher::checkAcknowReceived(const Message &vMessage, const char *src)
+{
+    GuiActionType mActionId = vMessage.actionId;
+    Sequence      mSequence = vMessage.sequence;
+    bool ok = false;
+    if ( mActionId == GuiActionType::ID_Acknow ) {
+        ok = true;
+        #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
+            LOG_EVENT(tr("%1,Ack Bak, Sq:%2").arg(src).arg(mSequence));
+        #endif
+        #ifdef DEBUG_ACKBACK_HD_TO_UI
+            qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HD AckBak : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(mSequence).arg(vMessage.actionId);
+        #endif
+        emit didAcknowReceive(mSequence);
+    }
+    return ok;
+}
+
+bool MessageDispatcher::checkAcknowTransmit(const Message &vMessage, const char *src)
+{
+    bool ok = false;
+    GuiActionType mActionId = vMessage.actionId;
+    Sequence      mSequence = vMessage.sequence;
+    if (mSequence < 0) {
+        ok = true;
+        #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
+            LOG_EVENT(tr("%1,Ack Req, Sq:%2, ID:%3").arg(src).arg(mSequence).arg(Format::toHexString(mActionId)));
+        #endif
+        #ifdef DEBUG_ACKBACK_HD_TO_UI
+            qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HD AckReq : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(mSequence).arg(vMessage.actionId);
+        #endif
+        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ UI AckBak is immediately handled at the same place.
+        actionTransmit(GuiActionType::ID_Acknow, {}, -mSequence);
+        #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
+            LOG_EVENT(tr("UI,Ack Bak, Sq:%1").arg(-mSequence));
+        #endif
+        #ifdef DEBUG_ACKBACK_HD_TO_UI
+            qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ UI AckBak : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(-mSequence).arg(vMessage.actionId);
+        #endif
+    }
+    return ok;
+}
+
 /*!
  * \brief   MessageDispatcher::interpretMessage
  * \details Calls the MessageInterpreter interpretMessage method
@@ -801,47 +844,19 @@
 {
     bool ok = false;
     QVariantList  mData;
-    Sequence mSequence = vMessage.sequence;
-    Can_Source src = MessageInterpreter::identifySource(vMessage.can_id);
-    QString    ids = (src == Can_Source::eCan_HD) ? "HD" : ((src == Can_Source::eCan_DG) ? "DG" : "XX");
+    Can_Source srcID = MessageInterpreter::identifySource(vMessage.can_id);
+    const char *srcText = (srcID == Can_Source::eCan_HD) ? "HD" : ((srcID == Can_Source::eCan_DG) ? "DG" : "XX");
+    if ( ! checkAcknowReceived(vMessage, srcText) ) {   // check if the message was an acknowledge.
+        checkAcknowTransmit(vMessage, srcText);         // then  if needs acknow send it immediately.
+    }
+
     // coco begin validated: Has been validated manually. If MessageInterpreter::interpretMessage fails, this also returns false
-    if (_interpreter.interpretMessage(vMessage, mData)) {
-    // coco end
+    if ( _interpreter.interpretMessage( vMessage, mData ) ) {
         ok = true;
-        GuiActionType mActionId = vMessage.actionId;
-        switch (mActionId) {
-        case GuiActionType::ID_Acknow:
-            #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
-            LOG_EVENT(tr("%1,Ack Bak, Sq:%2").arg(ids).arg(mSequence));
-            #endif
-            #ifdef DEBUG_ACKBACK_HD_TO_UI
-                qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HD AckBak : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(mSequence).arg(vMessage.actionId);
-            #endif
-            emit didAcknowReceive(mSequence);
-            break;
-
-        default:
-            if (mSequence < 0) {
-                #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
-                LOG_EVENT(tr("%1,Ack Req, Sq:%2, ID:%3").arg(ids).arg(mSequence).arg(Format::toHexString(mActionId)));
-                #endif
-                #ifdef DEBUG_ACKBACK_HD_TO_UI
-                    qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HD AckReq : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(mSequence).arg(vMessage.actionId);
-                #endif
-                // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ UI AckBak is immediately handled at the same place.
-                actionTransmit(GuiActionType::ID_Acknow, {}, -mSequence);
-                #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
-                LOG_EVENT(tr("UI,Ack Bak, Sq:%1").arg(-mSequence));
-                #endif
-                #ifdef DEBUG_ACKBACK_HD_TO_UI
-                    qDebug() << tr(" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ UI AckBak : %1 %2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ").arg(-mSequence).arg(vMessage.actionId);
-                #endif
-            }
-            emit didActionReceive(mActionId, mData);
-            break;
-
-        }
+        emit didActionReceive(vMessage.actionId, mData);
     }
+    // coco end
+
     _messageList[vMessage.can_id].removeLast();
     return ok;
 }