Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -r5075786897d42d24a93ae5485936b5d50c307f65 -re81f545a20177c58fa54f6550657a96701dc5476
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 5075786897d42d24a93ae5485936b5d50c307f65)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision e81f545a20177c58fa54f6550657a96701dc5476)
@@ -7,8 +7,8 @@
 *
 * @file    Messaging.c
 *
-* @author  (last)      Arpita Srivastava
-* @date    (last)      15-Jul-2026
+* @author  (last)      suresh
+* @date    (last)      17-Aug-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -r3cafed12c435f95be8ae38a8e5a5cf20ec6b706f -re81f545a20177c58fa54f6550657a96701dc5476
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 3cafed12c435f95be8ae38a8e5a5cf20ec6b706f)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision e81f545a20177c58fa54f6550657a96701dc5476)
@@ -7,8 +7,8 @@
 *
 * @file    TDInterface.c
 *
-* @author  (last)      Sameer Kalliadan Poyil
-* @date    (last)      10-Jul-2026
+* @author  (last)      suresh
+* @date    (last)      12-Aug-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  06-Nov-2024
@@ -695,7 +695,96 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTDRequestDDFlush function handles a DD flush request from TD.
+ * @details \b Inputs: none
+ * @details \b Outputs: DD flush request processed
+ * @param message Pointer to the received message
+ * @return TRUE if request is accepted, FALSE otherwise.
+ *************************************************************************/
+BOOL handleTDRequestDDFlush( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
 
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        BOOL startingDDFlush;
+
+        memcpy( &startingDDFlush, message->payload, sizeof(U32) );
+
+        if ( TRUE == startingDDFlush )
+        {
+            result = startDDFlush();
+        }
+        else
+        {
+            ;// DO nothing
+        }
+    }
+
+    // Respond to request
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DD_2_TD, result );
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleTDRequestDDHeatDisinfect function handles a DD heat disinfection
+ * request from TD.
+ * @details \b Inputs: none
+ * @details \b Outputs: DD heat disinfection request processed
+ * @param message Pointer to the received message
+ * @return TRUE if request is accepted, FALSE otherwise.
+ *************************************************************************/
+BOOL handleTDRequestDDHeatDisinfect( MESSAGE_T *message )
+{
+    BOOL status = FALSE;
+
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        status = startDDHeatDisinfect( );
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DD_2_TD, status );
+
+    return status;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleTDRequestDDHeatDisinfectActiveCool function handles a DD heat
+ * disinfection active cool request from TD.
+ * @details \b Inputs: none
+ * @details \b Outputs: DD heat disinfection active cool request processed
+ * @param message Pointer to the received message
+ * @return TRUE if request is accepted, FALSE otherwise.
+ *************************************************************************/
+BOOL handleTDRequestDDHeatDisinfectActiveCool( MESSAGE_T *message )
+{
+    BOOL status = FALSE;
+
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        BOOL startingDDHeatDisinfect;
+
+        memcpy( &startingDDHeatDisinfect, message->payload, sizeof(U32) );
+
+        if ( TRUE == startingDDHeatDisinfect )
+        {
+            status = startDDHeatDisinfectActiveCool( );
+        }
+        else
+        {
+            ;//do nothing
+        }
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DD_2_TD, status );
+
+    return status;
+}
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/
Index: firmware/App/Services/TDInterface.h
===================================================================
diff -u -r5075786897d42d24a93ae5485936b5d50c307f65 -re81f545a20177c58fa54f6550657a96701dc5476
--- firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision 5075786897d42d24a93ae5485936b5d50c307f65)
+++ firmware/App/Services/TDInterface.h	(.../TDInterface.h)	(revision e81f545a20177c58fa54f6550657a96701dc5476)
@@ -7,8 +7,8 @@
 *
 * @file    TDInterface.h
 *
-* @author  (last)      Arpita Srivastava
-* @date    (last)      13-Jul-2026
+* @author  (last)      suresh
+* @date    (last)      12-Aug-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  06-Nov-2024
@@ -40,6 +40,9 @@
 
 BOOL handleDialysateDeliveryRequestMsg( MESSAGE_T *message );
 BOOL handlePreGenDialysateRequestMsg( MESSAGE_T *message );
+BOOL handleTDRequestDDFlush( MESSAGE_T *message );
+BOOL handleTDRequestDDHeatDisinfect( MESSAGE_T *message );
+BOOL handleTDRequestDDHeatDisinfectActiveCool( MESSAGE_T *message );
 
 void setTDOpMode( U32 opMode, U32 subMode );
 void setTDDialysateFlowrate( F32 dialFlowrate );