Index: sources/canbus/messageglobals.h
===================================================================
diff -u -r227f28b202f81ab3dd04a81868697025ccab6220 -re58b907a69d4ca7daa77d69791593b886d1b80e8
--- sources/canbus/messageglobals.h	(.../messageglobals.h)	(revision 227f28b202f81ab3dd04a81868697025ccab6220)
+++ sources/canbus/messageglobals.h	(.../messageglobals.h)	(revision e58b907a69d4ca7daa77d69791593b886d1b80e8)
@@ -29,9 +29,10 @@
 const QHash<Gui::GuiActionType ,quint8> payloadLen {
     {Gui::GuiActionType::PowerOff        ,   1     },
     {Gui::GuiActionType::KeepAlive       ,   0     },
-    {Gui::GuiActionType::BloodFlow       ,   7 * 4 } , // 7 parameters each 4bytes
-    {Gui::GuiActionType::DialysateFlow   ,   7 * 4 } , // 7 parameters each 4bytes
+    {Gui::GuiActionType::BloodFlow       ,   7 * 4 }, // 7 parameters each 4bytes
+    {Gui::GuiActionType::DialysateFlow   ,   7 * 4 }, // 7 parameters each 4bytes
     {Gui::GuiActionType::String          , 255     },
+    {Gui::GuiActionType::Acknow          ,   0     },
 };
 
 /*!
@@ -49,12 +50,17 @@
  */
 enum Frame_Data : quint8 {
     eLenCanFrame        =   8, ///< The length of each can frame. Should be padded by 0x00 if is less.
+#ifdef DISABLE_SEQUENCE
     eLenHeaderInfo      =   3, ///< The Header length witch is included in CRC after Sync byte
+#else
+    eLenHeaderInfo      =   5, ///< The Header length witch is included in CRC after Sync byte (it's the sum of eLenSequence + eLenActionId + eLenLength)
+#endif
     eLenMaxHeaderData   =   3, ///< Maximum data byte can be in one frame as header data portion
     eLenMaxData         = 255, ///< Maximum data length in a Can Message since data length value kept in one byte
 
     eLenSyncByte        =   1, ///< The length of Sync byte at the beginning of each header frame
-    eLenActionId        =   2, ///< The length of MessageID bytes (2) at the beginning of each header frame after sync
+    eLenSequence        =   2, ///< The length of Sequence number bytes (2) at the beginning of each header frame after sync
+    eLenActionId        =   2, ///< The length of MessageID bytes
     eLenLength          =   1, ///< The length of data length value byte at the beginning of each header frame after MessageID
 
     eLenCRCDigits       =   2,
@@ -98,6 +104,7 @@
  */
 struct Message { // TODO : Should be converted to MessageModel class // no time left for now !!!
     Can_Id              can_id;
+    qint16              sequence    = 0; // seq 0 is invalid
     Gui::GuiActionType  actionId    = Gui::GuiActionType::Unknown;
     int                 length      = 0;
     QByteArray          head;