Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r336f6c49e05f515ca1250e0fd9ea97e5f5b5f11c -r6d4aa77e6b85aa7621a234660f631e725fb1d441
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 336f6c49e05f515ca1250e0fd9ea97e5f5b5f11c)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 6d4aa77e6b85aa7621a234660f631e725fb1d441)
@@ -7,8 +7,8 @@
 *
 * @file    ModeStandby.c
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      17-Apr-2026
+* @author  (last)      Raghu Kallala
+* @date    (last)      22-Apr-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
@@ -479,4 +479,60 @@
  *************************************************************************/
 
 
+/*********************************************************************//**
+ * @brief
+ * The testValidateDDStandbyChangeReq function validate whether request
+ * operation sub mode is legal or not.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @param newSubMode the enumerated sub state of the mode
+ * @return TRUE if request is legal, FALSE if not
+ *************************************************************************/
+BOOL testValidateDDStandbyChangeReq( U32 newSubMode )
+{
+    BOOL result = FALSE;
+
+    if ( newSubMode < NUM_OF_DD_STANDBY_MODE_STATES )
+    {
+        switch ( newSubMode )
+        {
+            case DD_STANDBY_MODE_STATE_IDLE:
+                result = TRUE;
+                break;
+
+            case DD_STANDBY_MODE_STATE_PAUSE:
+            default:
+                break;
+        }
+    }
+
+    return result;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The testSignalNewDDStandbySubMode function request transition to a
+ * new operation sub mode.
+ * @details \b Inputs: none
+ * @details \b Outputs: standbyState
+ * @param newSubMode the enumerated sub state of the mode
+ * @return none
+ *************************************************************************/
+void testSignalNewDDStandbySubMode( U32 newSubMode )
+{
+    if ( newSubMode < NUM_OF_DD_STANDBY_MODE_STATES )
+    {
+        standbyState = (DD_STANDBY_MODE_STATE_T)newSubMode;
+
+        switch ( newSubMode )
+        {
+            // Any of these state require no special handling
+            case DD_STANDBY_MODE_STATE_IDLE:
+            case DD_STANDBY_MODE_STATE_PAUSE:
+            default:
+                break;
+        }
+    }
+}
+
 /**@}*/