Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -re80217b74a0db0ada1539f9b7b05e9264d6f83a2 -rd45ebd9da5b356cb88f9e1cc2b3d71f8cb0ddbab
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision e80217b74a0db0ada1539f9b7b05e9264d6f83a2)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision d45ebd9da5b356cb88f9e1cc2b3d71f8cb0ddbab)
@@ -328,11 +328,11 @@
                 self.demoCount = 0
                 self.demoCounter = 0
 
-            elif msg_id == MsgIds.MSG_ID_UI_SERVICE_MODE_REQUEST:               # 0xB0
-                rsp_id = MsgIds.MSG_ID_HD_RESPONSE_SERVICE_MODE_REQUEST
-                rsp_payload = integer_to_bytearray(EResponse.Accepted)
-                rsp_payload += integer_to_bytearray(RequestRejectReasons.REQUEST_REJECT_REASON_NONE.value)
-                self.demoCount = 0  # immediately
+            # SERVICE MODE
+            elif msg_id == MsgIds.MSG_ID_UI_SERVICE_MODE_REQUEST.value:               # 0xB0
+                rsp_id = MsgIds.MSG_ID_HD_OP_MODE_DATA
+                rsp_payload = integer_to_bytearray(HDOpModes.MODE_SERV.value)
+                rsp_payload += integer_to_bytearray(0)
 
             # INITIATE A NEW TREATMENT SETUP ----------------------------------
             elif msg_id == MsgIds.MSG_ID_UI_INITIATE_TREATMENT_REQUEST.value: