Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -raa8b9687b9396b4878cf0d5327d72a5d67477761 -r57fe78d545ac91ba3f8d38ff76079a0d7ec8c0db
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision aa8b9687b9396b4878cf0d5327d72a5d67477761)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 57fe78d545ac91ba3f8d38ff76079a0d7ec8c0db)
@@ -63,6 +63,18 @@
 
 #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.
+
+typedef struct
+{
+    U08 acknowledgement;         ///< Acknowledgement Byte
+} ACK_RESPONSE_PAYLOAD_T;
+
+typedef struct
+{
+    BOOL accepted;              ///< Accepted/Rejected
+    U32 rejection_reason;       ///< Rejection reason if not accepted.
+} UI_RESPONSE_PAYLOAD_T;
+
 
 // ********** public function prototypes **********