Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -ref511196d29f6b0de6ade9ea113d91164d938c88 -r992975fb3cd56ddd7567b5e27f8bebd9b9948e9d
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision ef511196d29f6b0de6ade9ea113d91164d938c88)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 992975fb3cd56ddd7567b5e27f8bebd9b9948e9d)
@@ -36,6 +36,7 @@
 #include "ModeHeatDisinfect.h"
 #include "ModeHeatDisinfectActiveCool.h"
 #include "ModeInitPOST.h"
+#include "ModeROPermeateSample.h"
 #include "ModeStandby.h"
 #include "MsgQueues.h"
 #include "NVDataMgmt.h"
@@ -1606,7 +1607,7 @@
     }
 
     // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
-    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_2_HD, ACK_REQUIRED );
+    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_REQUIRED );
 }
 
 /*********************************************************************//**
@@ -1789,7 +1790,39 @@
     serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_2_UI, ACK_REQUIRED );
 }
 
+/*************************************************************************
+ * @brief
+ * The handleStartStopDGROPermeateSample function handles a request to
+ * start or stop DG RO permeate sample mode.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message: a pointer to the message to handle
+ * @return result
+ *************************************************************************/
+void handleStartStopDGROPermeateSample( MESSAGE_T* message )
+{
+    BOOL status = FALSE;
 
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        BOOL startingDGROPermeateSample;
+
+        memcpy( &startingDGROPermeateSample, message->payload, sizeof(U32) );
+
+        if ( TRUE == startingDGROPermeateSample )
+        {
+            status = startDGROPermeateSample();
+        }
+        else
+        {
+            status = stopDGROPermeateSample();
+        }
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_HD, status );
+}
+
+
 // ***********************************************************************
 // **************** Message Handling Helper Functions ********************
 // ***********************************************************************
@@ -4754,7 +4787,7 @@
 {
     BOOL status = FALSE;
 
-    if ( 0 == sizeof( message->hdr.payloadLen ) )
+    if ( 0 == message->hdr.payloadLen )
     {
         status = TRUE;