Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rb0b3522f2bd0b5b20ecbfd53c8f55b0e646ffa11 -r101bf85b0b425e919b01b4b7fabcbd15fd5bbde5
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision b0b3522f2bd0b5b20ecbfd53c8f55b0e646ffa11)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 101bf85b0b425e919b01b4b7fabcbd15fd5bbde5)
@@ -1461,6 +1461,91 @@
 
 /*********************************************************************//**
  * @brief
+ * The sendTreatmentStartResponseMsg function constructs a treatment start
+ * request response message to the UI and queues the msg for transmit on
+ * the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : Treatment start response msg constructed and queued.
+ * @param accepted T/F - request accepted?
+ * @param reason reason code if rejected
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendTreatmentStartResponseMsg( BOOL accepted, U32 reason )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_START_TREATMENT_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &reason, sizeof( U32 ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleUIUserEndTreatmentRequest function handles a treatment end
+ * request message from the UI.
+ * @details
+ * Inputs : none
+ * Outputs : message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleUIUserEndTreatmentRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+
+    if ( message->hdr.payloadLen == 0 )
+    {
+        result = userRequestEndTreatment();
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, result );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The sendTreatmentEndResponseMsg function constructs a treatment end
+ * request response message to the UI and queues the msg for transmit on
+ * the appropriate CAN channel.
+ * @details
+ * Inputs : none
+ * Outputs : Treatment end response msg constructed and queued.
+ * @param accepted T/F - request accepted?
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendTreatmentEndResponseMsg( BOOL accepted )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_START_TREATMENT_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL );
+
+    memcpy( payloadPtr, &accepted, sizeof( BOOL ) );
+
+    // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_HD_2_UI, ACK_REQUIRED );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleTreatmentParametersFromUI function handles a treatment parameters
  * set and validate request message from the UI.
  * @details