Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -rdb4ababe9942a6c755ffc11d25af50f598e8dba6 -r105b259d8643b6d50a42bbeb230d408bc6d20cf5
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision db4ababe9942a6c755ffc11d25af50f598e8dba6)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 105b259d8643b6d50a42bbeb230d408bc6d20cf5)
@@ -233,6 +233,7 @@
     { MSG_ID_FP_FILTERED_COND_SENSOR_TEMPERATURE_OVERRIDE_REQUEST,                  &testFPConductivitySensorFilteredTemperatureReadingsOverride },
     { MSG_ID_DD_VOLTAGE_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST,                     &testVoltageDataPublishIntervalOverride },
     { MSG_ID_DD_MONITORED_VOLTAGE_OVERRIDE_REQUEST,                                 &testVoltageOverride },
+    { MSG_ID_DD_TREATMENT_PARAMS_OVERRIDE_REQUEST,                                  &testTDTreatmentParamsOverride },
     { MSG_ID_FP_LEVEL_PUBLISH_INTERVAL_OVERRIDE_REQUEST,                            &testFPLevelsDataPublishIntervalOverride },
     { MSG_ID_FP_LEVEL_OVERRIDE_REQUEST,                                             &testFPLevelStateOverride },
     { MSG_ID_FP_PERMEATE_TANK_PUBLISH_INTERVAL_OVERRIDE_REQUEST,                    &testPermeateTankDataPublishIntervalOverride },
Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -rb212425c0c7e9b69b4de7d46dd41030dfc3efa62 -r105b259d8643b6d50a42bbeb230d408bc6d20cf5
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision b212425c0c7e9b69b4de7d46dd41030dfc3efa62)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 105b259d8643b6d50a42bbeb230d408bc6d20cf5)
@@ -465,5 +465,46 @@
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/
 
+/*********************************************************************//**
+ * @brief
+ *  Apply DD treatment parameter overrides received from Dialin.
+ * @details
+ * Handles DD_TREATMENT_PARAMS_OVERRIDE_PAYLOAD_T and updates:
+ * dialysate flow (F32), UF rate (F32), dialysate temperature (F32)
+ * acid and bicarbonate concentrate options (U32) Overrides
+ * are applied only in DD_MODE_GEND, followed by
+ * setTreatmentParamUpdate().
+ * @param message  Pointer to override message from Dialin.
+ * @return TRUE if override applied, FALSE otherwise.
+ *************************************************************************/
+BOOL testTDTreatmentParamsOverride( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
 
+    if( message->hdr.payloadLen == sizeof( DD_TREATMENT_PARAMS_OVERRIDE_PAYLOAD_T ) )
+    {
+        DD_TREATMENT_PARAMS_OVERRIDE_PAYLOAD_T payload;
+        DD_OP_MODE_T ddMode = getCurrentOperationMode();
+
+        memcpy( &payload, message->payload, sizeof( DD_TREATMENT_PARAMS_OVERRIDE_PAYLOAD_T ) );
+
+        if( DD_MODE_GEND == ddMode )
+        {
+            // Overrides to DD working parameters
+            setTDDialysateFlowrate( payload.dialFlowRate_ml_min );
+            setTDUFRate( payload.ufRate_ml_h );
+            setTDTargetDialysateTemperature( payload.dialTemp_degC );
+            setTDAcidAndBicarbType( (DD_ACID_TYPES_T)payload.acidConcentrate, ( DD_BICARB_TYPES_T )payload.bicarbConcentrate );
+
+            // Notify to the system DD parameters changed
+            setTreatmentParamUpdate();
+
+            result = TRUE;
+        }
+    }
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DD_2_TD, result );
+
+    return result;
+}
+
 /**@}*/
Index: firmware/App/Services/TDInterface.h
===================================================================
diff -u -r363b26b9ab427b7e39e505425c1b15e0584669cb -r105b259d8643b6d50a42bbeb230d408bc6d20cf5
--- firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision 363b26b9ab427b7e39e505425c1b15e0584669cb)
+++ firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision 105b259d8643b6d50a42bbeb230d408bc6d20cf5)
@@ -53,10 +53,14 @@
 F32  getTDTargetDialysateTemperature( void );
 BOOL getTDDialyzerBypass( void );
 
+
 TD_OP_MODE_T      getTDOpMode( void );
 DD_ACID_TYPES_T   getTDAcidConcentrateType( void );
 DD_BICARB_TYPES_T getTDBicarbConcentrateType( void );
 
+BOOL testTDTreatmentParamsOverride ( MESSAGE_T *message );
+
+
 /**@}*/
 
 #endif