Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -rccfd15568f1e3d304320c2babb2fd4bcf0413304 -r3a480399e9fd87f51a12a469cc56242ebeb93539
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision ccfd15568f1e3d304320c2babb2fd4bcf0413304)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 3a480399e9fd87f51a12a469cc56242ebeb93539)
@@ -23,6 +23,7 @@
 #include "BloodLeak.h"
 #include "BloodPrime.h"
 #include "Bubble.h"
+#include "CommBuffers.h"
 #include "DGInterface.h"
 #include "DialInFlow.h"
 #include "DialOutFlow.h"
@@ -55,12 +56,18 @@
  *  @{
  */
 
-// ********** public definitions **********
+// ********** public definitions **********
+
+#define ACK_REQUIRED                    TRUE                ///< Macro for functions that want to know if an outgoing message requires acknowledgement from receiver.
+#define ACK_NOT_REQUIRED                FALSE               ///< Macro for functions that want to know if an outgoing message requires acknowledgement from receiver.
 
 // ********** public function prototypes **********
 
 // ACK MSG
-BOOL sendACKMsg( MESSAGE_T *message );
+BOOL sendACKMsg( MESSAGE_T *message );
+
+// Serialize message
+U32 serializeMessage( MESSAGE_T msg, COMM_BUFFER_T buffer, BOOL ackReq );
 
 // MSG_ID_DG_CHECK_IN
 void handleDGCheckIn( MESSAGE_T *message );
@@ -325,7 +332,7 @@
 BOOL sendTreatmentLogAlarmEventData( ALARM_ID_T alarmID, ALARM_DATA_T almData1, ALARM_DATA_T almData2 );
 
 // MSG_ID_HD_TREATMENT_LOG_EVENT
-BOOL sendTreatmentLogEventData( EVENT_ID_T event, F32 oldValue, F32 newValue );
+BOOL sendTreatmentLogEventData( HD_EVENT_ID_T event, F32 oldValue, F32 newValue );
 
 // *********** public DG command functions **********