Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -ra31707ccbf01a1b40f8500bc491dc9c616e7a163 -r50fc6ca962c381ac98c9f032115973a5fff2a761
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision a31707ccbf01a1b40f8500bc491dc9c616e7a163)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 50fc6ca962c381ac98c9f032115973a5fff2a761)
@@ -111,6 +111,7 @@
 void execOperationModes( void )
 {
     HD_OP_MODE_T newMode;
+    U32 priorSubMode = currentSubMode;
 
     // Any new mode requests?
     newMode = arbitrateModeRequest();   // Will return current mode if no pending requests
@@ -174,6 +175,16 @@
             break;
     }   // End switch
 
+    // Send sub-mode change event when appropriate
+    if ( lastMode != currentMode )
+    {
+        priorSubMode = 0;
+    }
+    if ( ( priorSubMode != currentSubMode ) || ( lastMode != currentMode ) )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_MODE_CHANGE, priorSubMode, currentSubMode )
+    }
+
     // Broadcast current operation mode on interval
     broadcastOperationMode();
 }