Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -r9b6d9a0db373b39c3d04dd07516fde59b292bbc5 -r23fd84a12113578bb1d86fdfbc86701494a35cf1
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 9b6d9a0db373b39c3d04dd07516fde59b292bbc5)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 23fd84a12113578bb1d86fdfbc86701494a35cf1)
@@ -8,7 +8,7 @@
 * @file    DGInterface.c
 *
 * @author  (last)      Sean Nash
-* @date    (last)      14-Aug-2023
+* @date    (last)      24-Aug-2023
 *
 * @author  (original)  Sean
 * @date    (original)  08-Apr-2020
@@ -99,11 +99,6 @@
 static DG_RESERVOIR_ID_T dgActiveReservoir;                                 ///< Latest active reservoir reported by the DG.
 static DG_RESERVOIR_ID_T dgActiveReservoirSet;                              ///< Active reservoir commanded.
 
-static U32 dgReservoirFillVolumeTarget = 0;                                 ///< Latest fill-to volume reported by the DG.
-static U32 dgReservoirFillVolumeTargetSet = 0;                              ///< Fill-to volume commanded.
-static U32 dgReservoirDrainVolumeTarget = 0;                                ///< Latest drain-to volume reported by the DG.
-static U32 dgReservoirDrainVolumeTargetSet = 0;                             ///< Drain-to volume commanded.
-
 static DG_DISINFECT_UI_STATES_T disinfectsStatus;                           ///< DG disinfects status.
 static DG_MIXING_RATIOS_T dgMixingRatios;                                   ///< DG mixing ratios.
 static HEATERS_DATA_T dgHeatersData;                                        ///< DG heaters data.
@@ -134,10 +129,8 @@
     dgTrimmerHeaterOn               = FALSE;
     dgTrimmerTempSet                = 0.0F;
     dgTrimmerTempCheckTimerCtr      = 0;
-    dgActiveReservoirSet            = DG_RESERVOIR_1;
-    dgActiveReservoir               = DG_RESERVOIR_1;
-    dgReservoirFillVolumeTargetSet  = 0;
-    dgReservoirDrainVolumeTargetSet = 0;
+    dgActiveReservoirSet            = DG_RESERVOIR_2;
+    dgActiveReservoir               = DG_RESERVOIR_2;
     dgDialysateTemp                 = 0.0F;
     dgCurrentOpMode                 = DG_MODE_INIT;
     dgSubMode                       = 0;
@@ -469,7 +462,7 @@
  * The getDialysateTemperature function gets the latest dialysate temperature.
  * @details Inputs: dgDialysateTemp
  * @details Outputs: none
- * @return the current dialysate temperature
+ * @return the latest dialysate temperature
  *************************************************************************/
 F32 getDialysateTemperature( void )
 {
@@ -478,6 +471,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The getRedundantDialysateTemperature function gets the latest redundant
+ * dialysate temperature.
+ * @details Inputs: dgRedundantDialysateTemp
+ * @details Outputs: none
+ * @return the latest redundant dialysate temperature
+ *************************************************************************/
+F32 getRedundantDialysateTemperature( void )
+{
+    return dgRedundantDialysateTemp;
+}
+
+/*********************************************************************//**
+ * @brief
  * The getHeatDisinfectTemperatureSensorValue function gets the latest
  * heat disinfect temperature sensor value.
  * @details Inputs: dgDialysateTemp
@@ -505,7 +511,7 @@
 /*********************************************************************//**
  * @brief
  * The getDGDisinfectsStates function returns the DG disinfects readings.
- * @details Inputs: none
+ * @details Inputs: disinfectsStatus
  * @details Outputs: none
  * @return the current DG disinfects readings
  *************************************************************************/
@@ -518,7 +524,7 @@
  * @brief
  * The getDGMixingRatios function returns the DG mixing ratios and the fill
  * prep time.
- * @details Inputs: none
+ * @details Inputs: dgMixingRatios
  * @details Outputs: none
  * @return getDGMixingRatios which is the DG mixing ratios
  *************************************************************************/
@@ -598,8 +604,7 @@
  * The setDGReservoirsData function sets the latest reservoir data
  * reported by the DG.
  * @details Inputs: none
- * @details Outputs: dgActiveReservoir, dgReservoirFillVolumeTarget,
- * dgReservoirDrainVolumeTarget, dgReservoirsDataFreshFlag
+ * @details Outputs: dgActiveReservoir, dgReservoirsDataFreshFlag
  * @param resID ID of active reservoir
  * @param fillVol Reservoir fill to volume reported by DG
  * @param drainVol Reservoir drain to volume reported by DG
@@ -610,8 +615,6 @@
     if ( resID < NUM_OF_DG_RESERVOIRS )
     {
         dgActiveReservoir = resID;
-        dgReservoirFillVolumeTarget = fillVol;
-        dgReservoirDrainVolumeTarget = drainVol;
     }
     else
     {
@@ -909,7 +912,6 @@
 void cmdStartDGFill( U32 fillToVolMl, F32 targetFlowLPM )
 {
     dgCmdResp[ DG_CMD_START_FILL ].commandID = DG_CMD_NONE;
-    dgReservoirFillVolumeTargetSet = fillToVolMl;
 
     sendDGFillCommand( DG_CMD_START, fillToVolMl, targetFlowLPM );
 }
@@ -924,7 +926,6 @@
 void cmdStopDGFill( void )
 {
     dgCmdResp[ DG_CMD_STOP_FILL ].commandID = DG_CMD_NONE;
-    dgReservoirFillVolumeTargetSet = 0;
 
     sendDGFillCommand( DG_CMD_STOP, 0, 0 );
 }
@@ -948,7 +949,6 @@
     payload.tareLoadCells                     = tareLoadCell;
     payload.rinseConcentrateLines             = rinse;
     payload.cmd                               = start;
-    dgReservoirDrainVolumeTargetSet           = drainToVolMl;
 
     sendDGDrainCommand( &payload );
 }
Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -r9b6d9a0db373b39c3d04dd07516fde59b292bbc5 -r23fd84a12113578bb1d86fdfbc86701494a35cf1
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 9b6d9a0db373b39c3d04dd07516fde59b292bbc5)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 23fd84a12113578bb1d86fdfbc86701494a35cf1)
@@ -7,8 +7,8 @@
 *
 * @file    DGInterface.h
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      06-Jun-2023
+* @author  (last)      Sean Nash
+* @date    (last)      08-Aug-2023
 *
 * @author  (original)  Sean
 * @date    (original)  08-Apr-2020
@@ -118,6 +118,7 @@
 F32 getReservoirWeightLargeFilter( DG_RESERVOIR_ID_T resID );
 F32 getReservoirBackupWeightLargeFilter( DG_RESERVOIR_ID_T resID );
 F32 getDialysateTemperature( void );
+F32 getRedundantDialysateTemperature( void );
 F32 getHeatDisinfectTemperatureSensorValue( void );
 BOOL getTrimmerHeaterCommandedOn( void );
 DG_DISINFECT_UI_STATES_T getDGDisinfectsStates( void );
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r4828ff8bd5b5ff97f36de33101d8ca4b9e54bfa1 -r23fd84a12113578bb1d86fdfbc86701494a35cf1
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 4828ff8bd5b5ff97f36de33101d8ca4b9e54bfa1)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 23fd84a12113578bb1d86fdfbc86701494a35cf1)
@@ -8,7 +8,7 @@
 * @file    SystemCommMessages.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      15-Aug-2023
+* @date    (last)      25-Aug-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -2115,25 +2115,22 @@
  *************************************************************************/
 void handleAlarmTriggered( MESSAGE_T *message )
 {
-    if ( message->hdr.payloadLen == ( sizeof( U32 ) + sizeof( U32 ) * 2 * 2 ) )  // 2 data records w/ 2 U32s each
+    if ( message->hdr.payloadLen == sizeof( ALARM_TRIGGERED_PAYLOAD_T ) )
     {
+        ALARM_TRIGGERED_PAYLOAD_T payload;
         U08 *payloadPtr = message->payload;
-        U32 alarmID;
-        ALARM_DATA_T alm1, alm2;
 
-        memcpy( &alarmID, payloadPtr, sizeof( U32 ) );
-        payloadPtr += sizeof( U32 );
-        memcpy( &alm1.dataType, payloadPtr, sizeof( U32 ) );
-        payloadPtr += sizeof( U32 );
-        memcpy( &alm1.data, payloadPtr, sizeof( U32 ) );
-        payloadPtr += sizeof( U32 );
-        memcpy( &alm2.dataType, payloadPtr, sizeof( U32 ) );
-        payloadPtr += sizeof( U32 );
-        memcpy( &alm2.data, payloadPtr, sizeof( U32 ) );
+        memcpy( &payload, payloadPtr, sizeof( ALARM_TRIGGERED_PAYLOAD_T ) );
 
-        if ( (ALARM_ID_T)alarmID < NUM_OF_ALARM_IDS )
+        if ( (ALARM_ID_T)(payload.alarm) < NUM_OF_ALARM_IDS )
         {
-            activateAlarm2Data( (ALARM_ID_T)alarmID, alm1, alm2 );
+            ALARM_DATA_T alm1, alm2;
+
+            alm1.dataType       = (ALARM_DATA_TYPES_T)(payload.almDataType1);
+            alm1.data.uInt.data = payload.almData1;
+            alm2.dataType       = (ALARM_DATA_TYPES_T)(payload.almDataType2);
+            alm2.data.uInt.data = payload.almData2;
+            activateAlarm2Data( (ALARM_ID_T)(payload.alarm), alm1, alm2, TRUE );
         }
     }
 }
@@ -4405,20 +4402,20 @@
  *************************************************************************/
 void handleTestArterialPressureOverrideRequest( MESSAGE_T *message )
 {
-    TEST_OVERRIDE_PAYLOAD_T payload;
+    TEST_OVERRIDE_ARRAY_PAYLOAD_T payload;
     BOOL result = FALSE;
 
     // Verify payload length
-    if ( sizeof(TEST_OVERRIDE_PAYLOAD_T) == message->hdr.payloadLen )
+    if ( sizeof( TEST_OVERRIDE_ARRAY_PAYLOAD_T ) == message->hdr.payloadLen )
     {
-        memcpy( &payload, message->payload, sizeof(TEST_OVERRIDE_PAYLOAD_T) );
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_ARRAY_PAYLOAD_T ) );
         if ( FALSE == payload.reset )
         {
-            result = testSetArterialPressureOverride( payload.state.f32 );
+            result = testSetArterialPressureOverride( payload.state.f32, payload.index );
         }
         else
         {
-            result = testResetArterialPressureOverride();
+            result = testResetArterialPressureOverride( payload.index );
         }
     }
 
@@ -4437,20 +4434,20 @@
  *************************************************************************/
 void handleTestVenousPressureOverrideRequest( MESSAGE_T *message )
 {
-    TEST_OVERRIDE_PAYLOAD_T payload;
+    TEST_OVERRIDE_ARRAY_PAYLOAD_T payload;
     BOOL result = FALSE;
 
     // Verify payload length
-    if ( sizeof(TEST_OVERRIDE_PAYLOAD_T) == message->hdr.payloadLen )
+    if ( sizeof( TEST_OVERRIDE_ARRAY_PAYLOAD_T ) == message->hdr.payloadLen )
     {
-        memcpy( &payload, message->payload, sizeof(TEST_OVERRIDE_PAYLOAD_T) );
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_ARRAY_PAYLOAD_T ) );
         if ( FALSE == payload.reset )
         {
-            result = testSetVenousPressureOverride( payload.state.f32 );
+            result = testSetVenousPressureOverride( payload.state.f32, payload.index );
         }
         else
         {
-            result = testResetVenousPressureOverride();
+            result = testResetVenousPressureOverride( payload.index );
         }
     }
 
@@ -6225,7 +6222,6 @@
     TEST_OVERRIDE_ARRAY_PAYLOAD_T payload;
     BOOL result = FALSE;
 
-#ifndef _RELEASE_
     // Verify payload length
     if ( sizeof(TEST_OVERRIDE_ARRAY_PAYLOAD_T) == message->hdr.payloadLen )
     {
@@ -6239,7 +6235,6 @@
             result = testResetValvesCurrentOverride( payload.index );
         }
     }
-#endif
 
     // Respond to request
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
@@ -8357,11 +8352,8 @@
  *************************************************************************/
 void handleTestHDDialinCheckIn( MESSAGE_T* message )
 {
-    BOOL status = FALSE;
-
     if ( 0 == message->hdr.payloadLen )
     {
-        status = TRUE;
         setDialinCheckInTimeStamp();
     }
 }
@@ -8455,4 +8447,36 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTestHDPendingACKOverrideRequest function handles a
+ * request to override pending ACKs.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestHDPendingACKOverrideRequest( MESSAGE_T *message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetPendingACKOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetPendingACKOverride();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r9b6d9a0db373b39c3d04dd07516fde59b292bbc5 -r23fd84a12113578bb1d86fdfbc86701494a35cf1
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 9b6d9a0db373b39c3d04dd07516fde59b292bbc5)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 23fd84a12113578bb1d86fdfbc86701494a35cf1)
@@ -8,7 +8,7 @@
 * @file    SystemCommMessages.h
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      15-Aug-2023
+* @date    (last)      17-Aug-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -1013,6 +1013,9 @@
 // MSG_ID_HD_RAM_STATUS_OVERRIDE
 void handleTestHDRAMStatusOverrideRequest( MESSAGE_T* message );
 
+// MSG_ID_HD_CAN_RECEIVE_ACK_MESSAGE_OVERRIDE
+void handleTestHDPendingACKOverrideRequest( MESSAGE_T* message );
+
 /**@}*/
 
 #endif