Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r09e6cf9de34acf18f6e1138bf56ac0edb4821186 -r9a45dcbdfae33fc06479d99b8d52bada8f682194
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 09e6cf9de34acf18f6e1138bf56ac0edb4821186)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 9a45dcbdfae33fc06479d99b8d52bada8f682194)
@@ -1461,10 +1461,11 @@
  * @details Inputs: none
  * @details Outputs: DG fill command msg constructed and queued.
  * @param cmd start or stop fill command
- * @param fillToVolumeMl volume (in mL) to fill inactive reservoir to
+ * @param fillToVolumeMl volume (in mL) to fill inactive reservoir to
+ * @param targetFlowLRatePM target fill flow rate in L/min
  * @return TRUE if msg successfully queued for transmit, FALSE if not
  *************************************************************************/
-BOOL sendDGFillCommand( U32 cmd, U32 fillToVolumeMl )
+BOOL sendDGFillCommand( U32 cmd, U32 fillToVolumeMl, F32 targetFlowRateLPM )
 {
     BOOL result;
     MESSAGE_T msg;
@@ -1473,11 +1474,13 @@
     // Create a message record
     blankMessage( &msg );
     msg.hdr.msgID = MSG_ID_DG_FILL_CMD;
-    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( U32 );
+    msg.hdr.payloadLen = sizeof( U32 ) + sizeof( U32 ) + sizeof( F32 );
 
     memcpy( payloadPtr, &fillToVolumeMl, sizeof( U32 ) );
     payloadPtr += sizeof( U32 );
-    memcpy( payloadPtr, &cmd, sizeof( U32 ) );
+    memcpy( payloadPtr, &cmd, sizeof( U32 ) );
+    payloadPtr += sizeof( F32 );
+    memcpy( payloadPtr, &targetFlowRateLPM, sizeof( F32 ) );
 
     // 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_DG, ACK_REQUIRED );
@@ -1935,6 +1938,31 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The sendDGConcentrateMixingRatiosRequest function constructs a request msg
+ * to the DG to request the concentrate ratios and queues the msg for transmit
+ * on the appropriate CAN channel.
+ * @details Inputs: none
+ * @details Outputs: DG POST result request msg constructed and queued.
+ * @return TRUE if msg successfully queued for transmit, FALSE if not
+ *************************************************************************/
+BOOL sendDGConcentrateMixingRatiosRequest( void )
+{
+    BOOL result;
+    MESSAGE_T msg;
+
+    // Create a message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_HD_REQUEST_DG_CONCENTRATE_MIXING_RATIOS;
+    msg.hdr.payloadLen = 0;
+
+    // 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_DG, ACK_REQUIRED );
+
+    return result;
+}
+
 #ifdef EMC_TEST_BUILD
 BOOL broadcastCANErrorCount( U32 count )
 {
@@ -6730,7 +6758,6 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
-
 /*********************************************************************//**
 * @brief
 * The handleStopHDRTCClock function handles a request to stop the RTC clock.
@@ -6752,4 +6779,23 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleDGMixingRatios function handles a concentrate mixing ratios and
+ * prepare fill time broadcast from DG.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleDGMixingRatios( MESSAGE_T *message )
+{
+    if ( message->hdr.payloadLen == sizeof( DG_MIXING_RATIOS_T ) )
+    {
+        DG_MIXING_RATIOS_T payload;
+
+        memcpy( &payload, message->payload, sizeof( DG_MIXING_RATIOS_T ) );
+    }
+}
+
 /**@}*/