Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -r3c1ca4197b63f7988fe3bf58cf80299e4481416a -r6264a775ffd3bd50c9146e93a5e6f50b21f2981f
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 3c1ca4197b63f7988fe3bf58cf80299e4481416a)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 6264a775ffd3bd50c9146e93a5e6f50b21f2981f)
@@ -122,6 +122,7 @@
 void execOperationModes( void )
 {
     DG_OP_MODE_T newMode;
+    U32 priorSubMode = currentSubMode;
 
     // any new mode requests?
     newMode = arbitrateModeRequest();   // will return current mode if no pending requests
@@ -138,6 +139,7 @@
     if ( currentMode != newMode )
     {
         // handle transition to new mode
+        priorSubMode = 0;
         lastMode = currentMode;
         transitionToNewOperationMode( newMode );
         currentMode = newMode;
@@ -197,6 +199,13 @@
             break;
     }
 
+    // Send sub-mode change event when appropriate
+    if ( priorSubMode != currentSubMode )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_SUB_MODE_CHANGE, priorSubMode, currentSubMode );
+    }
+    priorSubMode = currentSubMode;
+
     // publish op mode on interval
     broadcastOperationMode();
 }
@@ -296,6 +305,8 @@
  *************************************************************************/
 static void transitionToNewOperationMode( DG_OP_MODE_T newMode )
 {
+    SEND_EVENT_WITH_2_U32_DATA( DG_EVENT_OP_MODE_CHANGE, lastMode, newMode );
+
     // setup for new operating mode
     switch ( newMode )
     {