Index: sources/device/DeviceModels.h
===================================================================
diff -u -r61f16c988a159401c92730b4cbfca5085c77222f -r97d593e2e7adb36f2f9f97f9bb9958dcef740bc1
--- sources/device/DeviceModels.h	(.../DeviceModels.h)	(revision 61f16c988a159401c92730b4cbfca5085c77222f)
+++ sources/device/DeviceModels.h	(.../DeviceModels.h)	(revision 97d593e2e7adb36f2f9f97f9bb9958dcef740bc1)
@@ -42,9 +42,12 @@
      * \param   vParameters   - list of parameter values of the model as a comma separated string.
      * \return  QString
      */
-    static QString toString (const QString &vStringPrefix, const QVariant &vParameters) {
-        QString senderID = "UI,";
-        return QString(senderID + vStringPrefix + "," + vParameters.toStringList().join(','));
+    static QString toString (const QString &vStringPrefix, const QVariantList &vParameters) {
+        QString senderID = MAbstract::unitText(MAbstract::Unit_Enum::eUI) + ",";
+        QString mString = QString(senderID + vStringPrefix);
+        for (const auto &param : vParameters)
+            mString += QString(",%1").arg(param.toString());
+        return mString;
     }
 };
 
@@ -57,17 +60,16 @@
     // friends
     friend class ::tst_models;
 
-    QVariantList parameters() const override;
-
 public:
-
     Type_Enum    typeText  () const override { return Type_Enum::eEvent      ; }
     Unit_Enum    unitText  () const override { return Unit_Enum::eDV         ; }
     QString      infoText  () const override { return QString("DeviceBase")  ; }
 
     struct Data {
+        // by default it has to be accepted with no rejection reason
         bool       mAccepted = true;  /*!< Accepted        value of type quint32 extracted out */
         quint32    mReason   = 0   ;  /*!< Reason          value of type quint32 extracted out */
+        QString    mMessage  = ""  ;  /*!< Message         value of type QString of the reason */
     };
 
     MDeviceResponseBase () { }
@@ -78,28 +80,33 @@
 
 // ------------------------------------------------------------------
 
-class MDeviceBrightnessResponse : MDeviceResponseBase {
-public:
-    struct Data : MDeviceResponseBase::Data {
-        quint8 mBrightnessPercent = 0;
-    } _data;
-
-    QString     infoText () const override { return QString("DeviceBrightness") ; }
-    Data        data     () const ;
-};
-
 class MDeviceBrightnessRequest : public MDeviceRequestBase {
 public:
+
     struct Data {
         quint8 mBrightnessPercent = 100;
     } _data;
 
+    explicit MDeviceBrightnessRequest(const Data &vData) : _data(vData) { }
+
     QString toString() {
         return MDeviceRequestBase::toString("DeviceBrightness", { _data.mBrightnessPercent });
     }
 };
 
+class MDeviceBrightnessResponse : public MDeviceResponseBase {
+public:
+    struct Data : MDeviceResponseBase::Data {
+        quint8 mBrightnessPercent = 0;
+    } _data;
+
+    QVariantList parameters () const override { return { _data.mBrightnessPercent }; }
+    QString     infoText    () const override { return QString("DeviceBrightness") ; }
+    Data        data        () const;
+};
+
 }
 
-typedef Model::MDeviceBrightnessRequest ::Data  DeviceBrightnessRequestData;
-typedef Model::MDeviceBrightnessResponse::Data DeviceBrightnessResponseData;
+typedef Model::MDeviceResponseBase      ::Data  DeviceResponseBaseData       ;
+typedef Model::MDeviceBrightnessRequest ::Data  DeviceBrightnessRequestData  ;
+typedef Model::MDeviceBrightnessResponse::Data  DeviceBrightnessResponseData ;