Index: firmware/App/Modes/OperationModes.h
===================================================================
diff -u -r3b70632c04247a6973960e1f37ae73eb4384a6b7 -r7d4711edd7b40cd3e29f43e766f79a8a09586fe9
--- firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 3b70632c04247a6973960e1f37ae73eb4384a6b7)
+++ firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 7d4711edd7b40cd3e29f43e766f79a8a09586fe9)
@@ -1,14 +1,14 @@
 /**************************************************************************
 *
-* Copyright (c) 2019-2022 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2019-2024 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @file    OperationModes.h
 *
-* @author  (last)      Sean Nash
-* @date    (last)      08-Jul-2022
+* @author  (last)      Dara Navaei
+* @date    (last)      14-Sep-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -31,6 +31,8 @@
 
 // ********** public definitions **********
 
+#define NO_SUB_STATE    0xFF ///< value for when submode does not have specific substates and is not applicable.
+
 /// Operation modes data structure
 typedef struct
 {
@@ -45,6 +47,8 @@
 void requestNewOperationMode( DG_OP_MODE_T newMode );   // request a transition to a new operation mode
 DG_OP_MODE_T getCurrentOperationMode( void );           // get the current operation mode
 DG_OP_MODE_T getPreviousOperationMode( void );          // get the previous operation mode
+U32 getCurrentOperationSubMode( void );                 // get current operation sub mode
+void setCurrentSubState( U32 subState );                // Set the current substate.
 
 BOOL testSetOperationMode( DG_OP_MODE_T newMode );      // Force transition to a given mode (if allowed)
 BOOL testSetDGOpModePublishIntervalOverride( U32 value );