Index: MsgDefs.h
===================================================================
diff -u -r3a935b3ad48d076c8d1928410acb35a2c47fbbd0 -rd7e33fff14a31f886c926182546f7a05f9dfd186
--- MsgDefs.h	(.../MsgDefs.h)	(revision 3a935b3ad48d076c8d1928410acb35a2c47fbbd0)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision d7e33fff14a31f886c926182546f7a05f9dfd186)
@@ -319,6 +319,7 @@
     MSG_ID_HD_PRE_TREATMENT_DATA_PUBLISH_INTERVAL_OVERRIDE = 0x8073,    ///< HD pre-treatment mode data publish interval override request
     MSG_ID_HD_TREATMENT_DATA_PUBLISH_INTERVAL_OVERRIDE = 0x8074,        ///< HD treatment mode data publish interval override request
     MSG_ID_HD_POST_TREATMENT_DATA_PUBLISH_INTERVAL_OVERRIDE = 0x8075,   ///< HD post treatment mode data publish interval override request
+    MSG_ID_HD_BLOCK_MESSAGE_TRANSMISSION = 0x8076,                      ///< HD prevent transmission of given message(s)
 
     MSG_ID_FIRST_DG_TESTER_MESSAGE = 0xA000,                            ///< First DG test message ID
     MSG_ID_DG_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_DG_TESTER_MESSAGE,    ///< DG tester log-in
@@ -351,7 +352,7 @@
     MSG_ID_DG_SWITCHES_STATUS_OVERRIDE = 0xA01D,                        ///< DG switches status override
     MSG_ID_DG_SWITCHES_PUBLISH_INTERVAL_OVERRIDE = 0xA01E,              ///< DG switches data publish interval override
     MSG_ID_DG_OP_MODE_PUBLISH_INTERVAL_OVERRIDE = 0xA01F,               ///< DG operation mode publish interval override
-    MSG_ID___AVAILABLE_15 = 0xA020,                                     ///< This msg ID is available for use
+    MSG_ID_DG_BLOCK_MESSAGE_TRANSMISSION = 0xA020,                      ///< HD prevent transmission of given message(s)
     MSG_ID___AVAILABLE_16 = 0xA021,                                     ///< This msg ID is available for use
     MSG_ID_DG_SOFTWARE_RESET_REQUEST = 0xA022,                          ///< DG reset request
     MSG_ID_DG_CONCENTRATE_PUMP_MEASURED_SPEED_OVERRIDE = 0xA023,        ///< DG concentrate pump measured speed override request