Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r35a33f10e1c5bb5abde9d98236e7945e2ace981b -rba4d9696d4c0ac731775e0bcc5a7e50f65c90285
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 35a33f10e1c5bb5abde9d98236e7945e2ace981b)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision ba4d9696d4c0ac731775e0bcc5a7e50f65c90285)
@@ -18,12 +18,14 @@
 #ifndef __SYSTEM_COMM_MESSAGES_H__
 #define __SYSTEM_COMM_MESSAGES_H__
 
+#include "CommBuffers.h"
 #include "DGCommon.h"
 #include "DrainPump.h"
 #include "Fans.h"
 #include "FluidLeak.h"
 #include "Heaters.h"
 #include "LoadCell.h"
+#include "MessageSupport.h"
 #include "ModeChemicalDisinfect.h"
 #include "ModeFlush.h"
 #include "ModeHeatDisinfect.h"
@@ -47,8 +49,13 @@
 
 // ********** public definitions **********
 
+#define ACK_REQUIRED                    TRUE        ///< Require an ACK.
+#define ACK_NOT_REQUIRED                FALSE       ///< Not require an ACK.
+
 // ********** public function prototypes **********
 
+U32 serializeMessage( MESSAGE_T msg, COMM_BUFFER_T buffer, BOOL ackReq );
+
 // ACK MSG
 BOOL sendACKMsg( MESSAGE_T *message );