Important Update:

- Update Command port:
  - Simplified error handling
  - Provide error reply
- Added method GetNextParamGroup()

DeviceCore.h

@@ -231,6 +231,11 @@ protected:
             Param = &((*Param)->Next);
         return Param;
     }
+    inline TDeviceParamGroup * GetNextParamGroup( TDevice * Device, TDeviceParamGroup * LastParamGroup = NULL ) {
+        if (!Device) return NULL;
+        TDeviceParamGroup * ParamGroup = (LastParamGroup)? LastParamGroup->NextGroup : Device->FirstParamGroup;
+        return ParamGroup;
+    }
     inline TDeviceParam * GetNextReadParam( TDevice * Device, TDeviceParam * LastParam = NULL ) {
         if (!Device) return NULL;
         TDeviceParam * Param = (LastParam)? LastParam->Next : Device->FirstParam;