Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -rf990c9bb863683c74bbe78c71932a14d7cf35422 -r035e26e44bdb1ba5afa5c9a147941b9f91731ce7
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision f990c9bb863683c74bbe78c71932a14d7cf35422)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 035e26e44bdb1ba5afa5c9a147941b9f91731ce7)
@@ -30,6 +30,18 @@
     NUM_TREATMENT_PARAMETERS = 18
     instanceCount = 0
 
+    # UI version message field positions
+    START_POS_MAJOR = DenaliMessage.PAYLOAD_START_INDEX
+    END_POS_MAJOR = START_POS_MAJOR + 1
+    START_POS_MINOR = END_POS_MAJOR
+    END_POS_MINOR = START_POS_MINOR + 1
+    START_POS_MICRO = END_POS_MINOR
+    END_POS_MICRO = START_POS_MICRO + 1
+    START_POS_BUILD = END_POS_MICRO
+    END_POS_BUILD = START_POS_BUILD + 2
+    START_POS_COMPAT = END_POS_BUILD
+    END_POS_COMPAT = START_POS_COMPAT + 4
+
     def __init__(self, can_interface: str = "can0",
                  log_level: bool = None,
                  console_out: bool = False,
@@ -83,10 +95,25 @@
             self.can_interface.register_receiving_publication_function(DenaliChannels.ui_to_hd_ch_id,
                                                                        MsgIdsDialin.MSG_DIALIN_ID_UI_POST_REPORT_VERSION.value,
                                                                        self._handler_ui_post_ui_version_compatibility)
+            self.can_interface.register_receiving_publication_function(DenaliChannels.ui_to_hd_ch_id,
+                                                                       MsgIds.MSG_ID_HD_UI_VERSION_INFO_RESPONSE.value,
+                                                                       self._handler_ui_version)
+
         self.alarms_simulator = HDAlarmsSimulator(self.can_interface, self.logger)
 
         self.treatment_parameter_rejections = TreatmentParameterRejections()
 
+        # initialize variables that will be populated by UI version response
+        self.ui_version = None
+
+    def get_ui_version(self):
+        """
+        Gets the ui version
+
+        @return: The ui version
+        """
+        return self.ui_version
+
     def cmd_send_hd_post_single_result(self, result: int, test_num: int) -> None:
         """
         Reports a single result for power on self test
@@ -1857,6 +1884,40 @@
 
         self.can_interface.send(message, 0)
 
+    @publish(["ui_version"])
+    def _handler_ui_version(self, message) -> None:
+        """
+        Handles the ui version response
+        @param message: The ui version response message
+        @return: None
+        """
+        major = struct.unpack('B', bytearray(
+            message['message'][self.START_POS_MAJOR:self.END_POS_MAJOR]))
+        minor = struct.unpack('B', bytearray(
+            message['message'][self.START_POS_MINOR:self.END_POS_MINOR]))
+        micro = struct.unpack('B', bytearray(
+            message['message'][self.START_POS_MICRO:self.END_POS_MICRO]))
+        build = struct.unpack('H', bytearray(
+            message['message'][self.START_POS_BUILD:self.END_POS_BUILD]))
+        compatibility = struct.unpack('H', bytearray(
+            message['message'][self.START_POS_COMPAT:self.END_POS_COMPAT]))
+
+        if all([len(each) > 0 for each in [major, minor, micro, build]]):
+            self.ui_version = f"v{major[0]}.{minor[0]}.{micro[0]}-{build[0]}-{compatibility[0]}"
+            self.logger.debug(f"UI VERSION: {self.ui_version}")
+
+    def cmd_send_hd_request_ui_version(self) -> None:
+        """
+        the HD response to the UI sending the user chimical disinfection steps confirm.
+
+        @return: None
+        """
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.hd_to_ui_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_UI_VERSION_INFO_REQUEST.value,
+                                              payload=None)
+
+        self.can_interface.send(message, 0)
+
     # ------------------------------------------------ GENERAL MESSAGES ------------------------------------------------
 
     def cmd_send_general_hd_response(self, message_id: int, accepted: int, reason: int,