Index: firmware/App/Modes/OperationModes.h
===================================================================
diff -u -r6499ea25921fcf67826fa0c35bb03caf411ba542 -rd19a072db6880577f677093929b53445e34a33e3
--- firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 6499ea25921fcf67826fa0c35bb03caf411ba542)
+++ firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision d19a072db6880577f677093929b53445e34a33e3)
@@ -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 +47,7 @@
 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
+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 );