Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -re08f4a03a3528ab2835cbd379187e08a58cea62e -r008d18e14db9f73782072e42a71ff364915c5f83
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision e08f4a03a3528ab2835cbd379187e08a58cea62e)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 008d18e14db9f73782072e42a71ff364915c5f83)
@@ -124,6 +124,7 @@
     { MSG_ID_DD_TESTER_LOGIN_REQUEST,                                               &handleTesterLogInRequest },
     { MSG_ID_DD_SOFTWARE_RESET_REQUEST,                                             &handleDDSoftwareResetRequest },
     { MSG_ID_TD_OP_MODE_DATA,                                                       &handleSetTDOperationMode },
+    { MSG_ID_TD_DD_COMMAND_REQUEST,                                                 &handleTDCommandRequest },
     { MSG_ID_FFU_SIGNAL_DD_UPDATE_AVAILABLE,                                        &handleUpdateAvailable },
     { MSG_ID_UI_DD_NVM_GET_RECORD_REQUEST,                                          &handleDDGetNVRecord },
     { MSG_ID_UI_DD_NVM_SET_SYSTEM_RECORD_REQUEST,                                   &handleDDSetNVSystemRecord },
Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -re08f4a03a3528ab2835cbd379187e08a58cea62e -r008d18e14db9f73782072e42a71ff364915c5f83
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision e08f4a03a3528ab2835cbd379187e08a58cea62e)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 008d18e14db9f73782072e42a71ff364915c5f83)
@@ -611,6 +611,101 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleTDCommandRequest function handles a generic DD command
+ * request received from TD.
+ * @details \b Inputs: DD command request from TD.
+ * @details \b Outputs: Requested DD operation initiated and command
+ * response sent to TD.
+ * @param message Pointer to the received command request message.
+ * @return TRUE if the command is accepted, FALSE otherwise.
+ *************************************************************************/
+BOOL handleTDCommandRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+    DD_COMMAND_T command = DD_CMD_NONE;
+    DD_CMD_RESPONSE_T response;
+
+    response.commandID  = DD_CMD_NONE;
+    response.rejected   = TRUE;
+    response.rejectCode = DD_CMD_REQUEST_REJECT_REASON_INVALID_PARAMETER;
+
+    if ( sizeof( U32 ) == message->hdr.payloadLen )
+    {
+        memcpy( &command, message->payload, sizeof( U32 ) );
+
+        response.commandID = (U32)command;
+
+        if ( ( DD_CMD_NONE < command ) &&
+             ( command < NUM_OF_DD_COMMANDS ) )
+        {
+            response.rejectCode = DD_CMD_REQUEST_REJECT_REASON_INVALID_MODE;
+
+            switch ( command )
+            {
+                case DD_CMD_GOTO_POST_GENERATE:
+                    if ( DD_MODE_GEND == getCurrentOperationMode() )
+                    {
+                        requestNewOperationMode( DD_MODE_POSG );
+
+                        result = TRUE;
+                    }
+                    break;
+
+                case DD_CMD_GOTO_STANDBY:
+                    if ( DD_MODE_POSG == getCurrentOperationMode() )
+                    {
+                        requestNewOperationMode( DD_MODE_STAN );
+
+                        result = TRUE;
+                    }
+                    break;
+
+                case DD_CMD_START_DISINFECT_SKIP:
+                    if ( DD_MODE_STAN == getCurrentOperationMode() )
+                    {
+                        // Skip requires no DD mode transition.
+                        result = TRUE;
+                    }
+                    break;
+
+                case DD_CMD_START_DISINFECT_HEAT:
+                    if ( DD_MODE_STAN == getCurrentOperationMode() )
+                    {
+                        result = startDDHeatDisinfect();
+                    }
+                    break;
+
+                case DD_CMD_START_DISINFECT_FLUSH:
+                case DD_CMD_START_DISINFECT_HEAT_CITRIC:
+                case DD_CMD_START_DISINFECT_SUBSTITUTION_PORT:
+                    response.rejectCode =
+                            DD_CMD_REQUEST_REJECT_REASON_INVALID_PARAMETER;
+                    break;
+
+                default:
+                    response.rejectCode =
+                            DD_CMD_REQUEST_REJECT_REASON_INVALID_PARAMETER;
+                    break;
+            }
+
+            if ( TRUE == result )
+            {
+                response.rejected   = FALSE;
+                response.rejectCode = DD_CMD_REQUEST_REJECT_REASON_NONE;
+            }
+        }
+    }
+
+    sendMessage( MSG_ID_DD_COMMAND_RESPONSE,
+                 COMM_BUFFER_OUT_CAN_DD_2_TD,
+                 (U08 *)&response,
+                 sizeof( DD_CMD_RESPONSE_T ) );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleTDRequestDDFlush function handles a DD flush request from TD.
  * @details \b Inputs: none
  * @details \b Outputs: DD flush request processed
Index: firmware/App/Services/TDInterface.h
===================================================================
diff -u -re08f4a03a3528ab2835cbd379187e08a58cea62e -r008d18e14db9f73782072e42a71ff364915c5f83
--- firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision e08f4a03a3528ab2835cbd379187e08a58cea62e)
+++ firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision 008d18e14db9f73782072e42a71ff364915c5f83)
@@ -40,6 +40,7 @@
 
 BOOL handleDialysateDeliveryRequestMsg( MESSAGE_T *message );
 BOOL handlePreGenDialysateRequestMsg( MESSAGE_T *message );
+BOOL handleTDCommandRequest( MESSAGE_T *message );
 BOOL handleTDRequestDDFlush( MESSAGE_T *message );
 BOOL handleTDRequestDDHeatDisinfect( MESSAGE_T *message );
 BOOL handleTDRequestDDHeatDisinfectActiveCool( MESSAGE_T *message );