Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r05db2649fc3ffe396ef21e1adf7939440a56e404 -r50c1ca0f742240722dd96bf141b0d7d34c37ed55
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 05db2649fc3ffe396ef21e1adf7939440a56e404)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 50c1ca0f742240722dd96bf141b0d7d34c37ed55)
@@ -8,7 +8,7 @@
 * @file    SystemCommMessages.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      15-Aug-2023
+* @date    (last)      17-Aug-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -8450,4 +8450,36 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTestHDPendingACKOverrideRequest function handles a
+ * request to override pending ACKs.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestHDPendingACKOverrideRequest( MESSAGE_T *message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // Verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetPendingACKOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetPendingACKOverride();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/