Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r98eaa905f2487013d5e9af76bf064f872332c2fe -r5d8530d242d8065178eab9e3e5d8e4561b790e01
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 98eaa905f2487013d5e9af76bf064f872332c2fe)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 5d8530d242d8065178eab9e3e5d8e4561b790e01)
@@ -27,6 +27,7 @@
 #include "Heaters.h"
 #include "LoadCell.h"
 #include "MessagePayloads.h"
+#include "ModeFlush.h"
 #include "ModeStandby.h"
 #include "ModeRecirculate.h"
 #include "MsgQueues.h"
@@ -911,7 +912,33 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The broadcastFlushData function sends out the flush mode data.
+ * @details Inputs: none
+ * @details Outputs: flush data msg constructed and queued
+ * @param flushData which is flush msg constructed and queued
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL broadcastFlushData( MODE_FLUSH_DATA_T *flushData )
+{
+    BOOL result;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
 
+    // create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_FLUSH_DATA;
+    msg.hdr.payloadLen = sizeof( MODE_FLUSH_DATA_T );
+
+    memcpy( payloadPtr, flushData, sizeof( MODE_FLUSH_DATA_T ) );
+
+    // 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_DG_BROADCAST, ACK_NOT_REQUIRED );
+
+    return result;
+}
+
 /*********************************************************************//**
  * @brief
  * The sendCommandResponseMsg function constructs a command response to HD
@@ -2511,7 +2538,15 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
-//*******************************************************************/
+/*********************************************************************//**
+* @brief
+* The handleROPumpTargetPressureOverride function handles a request
+* to override the RO pump target pressure.
+* @details Inputs: none
+* @details Outputs: message handled
+* @param message a pointer to the message to handle
+* @return none
+*************************************************************************/
 void handleROPumpTargetPressureOverride( MESSAGE_T *message )
 {
     BOOL result = FALSE;
@@ -2531,4 +2566,39 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+* @brief
+* The handleStartStopDGFlush function handles a request to override start
+* or stop DG flush mode.
+* @details Inputs: none
+* @details Outputs: message handled
+* @param message a pointer to the message to handle
+* @return none
+*************************************************************************/
+BOOL handleStartStopDGFlush( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        BOOL startingDGFlush;
+
+        memcpy( &startingDGFlush, message->payload, sizeof(U32) );
+
+        if ( TRUE == startingDGFlush )
+        {
+            startDGFlush();
+            result = TRUE;
+        }
+        else
+        {
+            stopDGFlush();
+            result = TRUE;
+        }
+    }
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_HD, result );
+
+    return result;
+}
+
 /**@}*/