Index: firmware/App/Modes/OperationModes.h
===================================================================
diff -u -r0a4dcd288d4347b85baaa0b07da568b6add5eac7 -r35a326b0f9f2fd83bac4be54e67ebde2d3f2c7e1
--- firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 0a4dcd288d4347b85baaa0b07da568b6add5eac7)
+++ firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 35a326b0f9f2fd83bac4be54e67ebde2d3f2c7e1)
@@ -31,6 +31,8 @@
 
 // ********** public definitions **********
 
+#define NO_SUB_STATE    0xFF ///< value for when submode does not have specific substates and is not applicable.
+
 /// Payload record structure for op mode broadcast message
 typedef struct
 {
@@ -50,6 +52,7 @@
 CONFIRMATION_REQUEST_STATUS_T getConfirmationRequestStatus( GENERIC_CONFIRM_ID_T request_id );      // Get the current confirmation request status
 void setConfirmationRequestStatus( GENERIC_CONFIRM_ID_T request_id, CONFIRMATION_REQUEST_STATUS_T status );  // Set the confirmation request status
 GENERIC_CONFIRM_ID_T addConfirmationRequest( GENERIC_CONFIRM_ID_T request_id, GENERIC_CONFIRM_COMMAND_T request_type, U32 reject_reason );  // Add a new confirmation request
+void setCurrentSubState( U32 subState );                            // Set the current substate.
 
 BOOL testSetOperationMode( HD_OP_MODE_T newMode );                  // Force transition to a given mode (if allowed)
 BOOL testSetOpModePublishIntervalOverride( U32 ms );