Index: dialin/common/msg_defs.py
===================================================================
diff -u -re41213d8e1c44fa12895f40276432f4a32d2d06f -r5d509ca990537206f53e7c3c7f21c88ebe9b8881
--- dialin/common/msg_defs.py	(.../msg_defs.py)	(revision e41213d8e1c44fa12895f40276432f4a32d2d06f)
+++ dialin/common/msg_defs.py	(.../msg_defs.py)	(revision 5d509ca990537206f53e7c3c7f21c88ebe9b8881)
@@ -103,8 +103,11 @@
     MSG_ID_HD_RINSEBACK_PROGRESS = 0x56                         # HD broadcast of rinseback progress
     MSG_ID_HD_RECIRCULATE_PROGRESS = 0x5A                       # HD broadcast of recirculate progress
     MSG_ID_HD_BLOOD_PRIME_PROGRESS = 0x59                       # HD broadcast of blood prime progress
+    MSG_ID_UI_TX_END_CMD = 0x57                                 # UI end treatment sub-mode user request
+    MSG_ID_HD_TX_END_CMD_RESPONSE = 0x58                        # HD end treatment sub-mode user request response
 
 
+
     MSG_ID_CAN_ERROR_COUNT = 0x999                              # test code in support of EMC testing
 
     # service/test CAN messages
Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -re41213d8e1c44fa12895f40276432f4a32d2d06f -r5d509ca990537206f53e7c3c7f21c88ebe9b8881
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision e41213d8e1c44fa12895f40276432f4a32d2d06f)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 5d509ca990537206f53e7c3c7f21c88ebe9b8881)
@@ -1683,3 +1683,25 @@
                                               payload=payload)
 
         self.can_interface.send(message, 0)
+
+    def cmd_send_treatment_adjust_end_response(self, vAccepted, vReason):
+        """
+        the treatment end state change Response message method
+        | MSG  | CAN ID | Box | Type   | Ack | Src | Dst | Description                         | #1:(U32)             | #2:(U32)           |
+        |:----:|:------:|:---:|:------:|:---:|:---:|:---:|:-----------:                        |:--:                  |:--:                |
+        |0x5800| 0x020  | 6   | Rsp    | Y   | HD  | UI  | Treatment End State Change Response | \ref Data::mAccepted | \ref Data::mReason |
+
+        :param vAccepted: (int) boolean accept/reject response
+        :param vReason  : (int) rejection reason
+        :return: None
+        """
+
+        payload = integer_to_bytearray(vAccepted)
+        payload += integer_to_bytearray(vReason)
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.hd_to_ui_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_TX_END_CMD_RESPONSE.value,
+                                              payload=payload)
+
+        self.can_interface.send(message, 0)
+