Index: firmware/App/Modes/TreatmentStop.c
===================================================================
diff -u -rb20421d84b9049977c04f4752f4fc5697425f25c -r1f91b5a53bda942b0967817bbd5e68a499dbf816
--- firmware/App/Modes/TreatmentStop.c	(.../TreatmentStop.c)	(revision b20421d84b9049977c04f4752f4fc5697425f25c)
+++ firmware/App/Modes/TreatmentStop.c	(.../TreatmentStop.c)	(revision 1f91b5a53bda942b0967817bbd5e68a499dbf816)
@@ -1,14 +1,14 @@
 /**************************************************************************
 *
-* Copyright (c) 2020-2022 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2020-2023 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    TreatmentStop.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      10-Aug-2022
+* @author  (last)      Michael Garthwaite
+* @date    (last)      19-Jan-2023
 *
 * @author  (original)  Sean
 * @date    (original)  15-Jan-2020
@@ -218,6 +218,8 @@
  *************************************************************************/
 void execTreatmentStop( void )
 {
+    TREATMENT_STOP_STATE_T priorSubState = currentTxStopState;
+
     // Execute treatment stop sub-mode state machine
     switch ( currentTxStopState )
     {
@@ -242,6 +244,10 @@
             break;
     }
 
+    if ( priorSubState != currentTxStopState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, currentTxStopState );
+    }
     // Broadcast treatment stop status
     publishTreatmentStopData();
 }