Index: sources/canbus/MessageInterpreter.cpp
===================================================================
diff -u -r27cc308ff5113a9386899d3c8f8b29962a8498e1 -r526875e8db8cf0c97f5cd8aa90564e41d42f5fde
--- sources/canbus/MessageInterpreter.cpp	(.../MessageInterpreter.cpp)	(revision 27cc308ff5113a9386899d3c8f8b29962a8498e1)
+++ sources/canbus/MessageInterpreter.cpp	(.../MessageInterpreter.cpp)	(revision 526875e8db8cf0c97f5cd8aa90564e41d42f5fde)
@@ -375,7 +375,7 @@
     switch (identifySource(vMessage.can_id)) {
     case Can_Source::eCan_HD: ok = interpretMessage_HD(vMessage, vData); break;
     case Can_Source::eCan_DG: ok = interpretMessage_DG(vMessage, vData); break;
-    default                 :                                            break;
+    default                 :      logUnhandledMessage(vMessage       ); break; // ok is still false.
     }
     return ok;
 }
@@ -674,10 +674,9 @@
 bool MessageInterpreter::logUnhandledMessage(const Message &vMessage) const {
     bool ok = false;
     quint16 id = vMessage.actionId;
-    if (_messageList.contains(id)) {
+    QString logString;    if (_messageList.contains(id)) {
         ok = true;
         QStringList items = _messageList[id];
-        QString logString;
         int index = 0;
         for ( int i = 0; i < items.count(); i++ ) {
             QString item = items[i];
@@ -728,5 +727,8 @@
         }
         LOG_DATUM(logString);
     }
+    else {
+        LOG_DEBUG(QString("Undefined unhandled message [%1]").arg(id, 0, 16));
+    }
     return ok;
 }