Index: sources/MessageGlobals.h
===================================================================
diff -u -ra271469db538bfc35eba9a56308760893ecbc68e -rc52253ab5fc73e9b59d9cd99eada3d526d799987
--- sources/MessageGlobals.h	(.../MessageGlobals.h)	(revision a271469db538bfc35eba9a56308760893ecbc68e)
+++ sources/MessageGlobals.h	(.../MessageGlobals.h)	(revision c52253ab5fc73e9b59d9cd99eada3d526d799987)
@@ -132,6 +132,7 @@
     ID_ALARM_STATUS_DATA                                     = 0x0100,
     ID_ALARM_CLEARED                                         = 0x0300,
     ID_UI_ALARM_USER_ACTION_REQUEST                          = 0x0600,
+    ID_UI_CHECK_IN                                           = 0x1000,
     ID_TD_OP_MODE_DATA                                       = 0x1200,
     ID_DD_CONDUCTIVITY_DATA                                  = 0x1F00,
     ID_TD_PRESSURE_DATA                                      = 0x2400,
@@ -188,6 +189,7 @@
     ID_TD_RECIRCULATE_DATA                                   = 0xA800,
     ID_TD_UI_GENERIC_CONFIRMATION_REQUEST                    = 0xB500,
     ID_UI_CONFIRMATION_RESULT_RESP                           = 0xB600,
+    ID_ACK_MESSAGE_THAT_REQUIRES_ACK                         = 0xFFFF,
 };
 
 enum TD_OP_MODE {