Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r24a98ea92563dad552889c30604d539d266b339e -r6419179374edcd65da462de84e8aeaefb7e20320
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 24a98ea92563dad552889c30604d539d266b339e)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 6419179374edcd65da462de84e8aeaefb7e20320)
@@ -191,7 +191,12 @@
 void checkInFromDG( void )
 {
     dgIsCommunicating = TRUE;
-    timeOfLastDGCheckIn = getMSTimerCount();
+    timeOfLastDGCheckIn = getMSTimerCount();
+
+    if ( TRUE == isAlarmActive( ALARM_ID_DG_COMM_TIMEOUT ) )
+    {
+        clearAlarm( ALARM_ID_DG_COMM_TIMEOUT );
+    }
 }
 
 /*********************************************************************//**
@@ -204,6 +209,11 @@
  *************************************************************************/
 void checkInFromUI( void )
 {
+    if ( FALSE == uiDidCommunicate )
+    {   // Start DG check-in timer when UI first communicates
+        timeOfLastDGCheckIn = getMSTimerCount();
+    }
+
     uiIsCommunicating = TRUE;
     timeOfLastUICheckIn = getMSTimerCount();
     uiDidCommunicate = TRUE;
@@ -930,11 +940,13 @@
         {
             activateAlarmNoData( ALARM_ID_UI_COMM_TIMEOUT );
         }
+
+        if ( TRUE == didTimeout( timeOfLastDGCheckIn, DG_COMM_TIMEOUT_IN_MS ) )
+        {
+            activateAlarmNoData( ALARM_ID_DG_COMM_TIMEOUT );
+            dgIsCommunicating = FALSE;
+        }
     }
-    if ( TRUE == didTimeout( timeOfLastDGCheckIn, DG_COMM_TIMEOUT_IN_MS ) )
-    {
-        dgIsCommunicating = FALSE;
-    }
 }
 
 /*********************************************************************//**
@@ -1179,8 +1191,8 @@
             handleTreatmentParametersFromUI( message );
             break;
 
-        case MSG_ID_UI_START_TREATMENT:
-            handleUIStartTreatmentMsg( message );
+        case MSG_ID_UI_INITIATE_TREATMENT_REQUEST:
+            handleInitiateTreatmentRequest( message );
             break;
 
         case MSG_ID_UI_USER_CONFIRM_TREATMENT_PARAMS:
@@ -1191,10 +1203,58 @@
             handleChangePressureLimitsRequest( message );
             break;
 
+        case MSG_ID_UI_HEPARIN_PAUSE_RESUME_REQUEST:
+            handleHeparinCommandRequest( message );
+            break;
+
         case MSG_ID_UI_SET_UF_VOLUME_PARAMETER:
             handleUFVolumeSetRequest( message );
             break;
 
+        case MSG_ID_UI_SAMPLE_WATER_CMD:
+            handleSampleWaterCmd( message );
+            break;
+
+        case MSG_ID_UI_SAMPLE_WATER_RESULT:
+            handleSampleWaterResult( message );
+            break;
+
+        case MSG_ID_UI_CONSUMABLE_INSTALL_CONFIRM:
+            handleConsumableInstallConfirm( message );
+            break;
+
+        case MSG_ID_UI_INSTALLATION_CONFIRM:
+            handleInstallationConfirm( message );
+            break;
+
+        case MSG_ID_UI_START_PRIME_REQUEST:
+            handleStartPrimeCmd( message );
+            break;
+
+        case MSG_ID_UI_PATIENT_CONNECTION_BEGIN_REQUEST:
+            handleContinueToTreatmentCmd( message );
+            break;
+
+        case MSG_ID_UI_PATIENT_CONNECTION_CONFIRM:
+            handlePatientConnectionConfirmCmd( message );
+            break;
+
+        case MSG_ID_UI_START_TREATMENT_REQUEST:
+            handleStartTreatmentRequest( message );
+            break;
+
+        case MSG_ID_UI_RINSEBACK_CMD:
+            handlRinsebackCmd( message );
+            break;
+
+        case MSG_ID_UI_RECIRC_CMD:
+            handleTreatmentRecircCmd( message );
+            break;
+
+        case MSG_ID_UI_TX_END_CMD:
+            handleTreatmentEndCmd( message );
+            break;
+
         case MSG_ID_DG_COMMAND_RESPONSE:
             handleDGCmdResp( message );
             break;
@@ -1203,8 +1263,32 @@
             handleTesterLogInRequest( message );
             break;
 
+        case MSG_ID_HD_SET_CALIBRATION_RECORD:
+            handleSetHDCalibrationRecord( message );
+            break;
+
+        case MSG_ID_HD_GET_CALIBRATION_RECORD:
+            handleGetHDCalibrationRecord( message );
+            break;
+
+        case MSG_ID_HD_SET_SYSTEM_RECORD:
+            handleSetHDSystemRecord( message );
+            break;
+
+        case MSG_ID_HD_GET_SYSTEM_RECORD:
+            handleGetHDSystemRecord( message );
+            break;
+
+        case MSG_ID_HD_GET_SERVICE_RECORD:
+            handleGetHDServiceRecord( message );
+            break;
+
+        case MSG_ID_HD_SET_SERVICE_RECORD:
+            handleSetHDServiceRecord( message );
+            break;
+
         default:
-            // TODO - unrecognized message ID received - ignore
+            // Unrecognized message ID received - ignore
             break;
     }
 
@@ -1255,6 +1339,10 @@
 
             case MSG_ID_BLOOD_FLOW_SEND_INTERVAL_OVERRIDE:
                 handleTestBloodFlowBroadcastIntervalOverrideRequest( message );
+                break;
+
+            case MSG_ID_TREATMENT_TIME_REMAINING_OVERRIDE:
+                handleTestTreatmentTimeRemainingOverrideRequest( message );
                 break;
 
             case MSG_ID_BLOOD_PUMP_MEAS_SPEED_OVERRIDE:
@@ -1431,12 +1519,55 @@
                 handleTestDialOutPumpHomeRequest( message );
                 break;
 
+            case MSG_ID_HD_FLUID_LEAK_SEND_INTERVAL_OVERRIDE:
+                handleSetFluidLeakBroadcastIntervalOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_FLUID_LEAK_STATE_DETECTOR_OVERRIDE:
+                handleSetFluidLeakStateDetectorOverrideRequest( message );
+
+            case MSG_ID_HD_SET_OP_MODE_REQUEST:
+                handleTestSetOpModeRequest( message );
+                break;
+
             case MSG_ID_SUPER_CLEAR_ALARMS_CMD:
                 handleTestSuperClearAlarmsRequest( message );
                 break;
 
+            case MSG_ID_HD_SYRINGE_PUMP_SEND_INTERVAL_OVERRIDE:
+                handleTestSyringePumpDataBroadcastIntervalOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_OPERATION_REQUEST:
+                handleTestSyringePumpOperationRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_MEASURED_RATE_OVERRIDE:
+                handleTestSyringePumpMeasuredRateOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_MEASURED_FORCE_OVERRIDE:
+                handleTestSyringePumpMeasuredForceOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_SYRINGE_DETECT_OVERRIDE:
+                handleTestSyringePumpMeasuredSyringeDetectOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_MEASURED_HOME_OVERRIDE:
+                handleTestSyringePumpMeasuredHomeOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_MEASURED_POSITION_OVERRIDE:
+                handleTestSyringePumpMeasuredPositionOverrideRequest( message );
+                break;
+
+            case MSG_ID_HD_SYRINGE_PUMP_MEASURED_VOLUME_OVERRIDE:
+                handleTestSyringePumpMeasuredVolumeOverrideRequest( message );
+                break;
+
             default:
-                // TODO - unrecognized message ID received - ignore
+                // Unrecognized message ID received - ignore
                 break;
         }
     }