Index: leahi_dialin/common/msg_ids.py
===================================================================
diff -u -r648db1c6ddd297bb1dcb04a4fec37dc4dee7656c -r9357937d8acaa33c4a5a18799349fbf4aa432ac1
--- leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 648db1c6ddd297bb1dcb04a4fec37dc4dee7656c)
+++ leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 9357937d8acaa33c4a5a18799349fbf4aa432ac1)
@@ -184,6 +184,7 @@
     MSG_ID_TD_RESET_ALL_TEST_CONFIGURATIONS = 0x803C
     MSG_ID_TD_AIR_PUMP_POWER_RAISE_OVERRIDE_REQUEST = 0x803D
     MSG_ID_TD_AIR_PUMP_POWER_LOWER_OVERRIDE_REQUEST = 0x803E
+    MSG_ID_TD_TRAINING_TEST_OVERRIDE_REQUEST = 0x8999
 
     MSG_ID_DD_TESTER_LOGIN_REQUEST = 0xA000
     MSG_ID_DD_SOFTWARE_RESET_REQUEST = 0xA001
Index: leahi_dialin/td/treatment_delivery.py
===================================================================
diff -u -r1d7d95e8ec37a124e2ccfeb4b462aa023dfffba7 -r9357937d8acaa33c4a5a18799349fbf4aa432ac1
--- leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision 1d7d95e8ec37a124e2ccfeb4b462aa023dfffba7)
+++ leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision 9357937d8acaa33c4a5a18799349fbf4aa432ac1)
@@ -238,15 +238,15 @@
         @return: None if not successful, the version string if unpacked successfully
         """
         major = struct.unpack('<B', bytearray(
-            message['message'][self.START_POS_MAJOR:self.END_POS_MAJOR]))
+            message['message'][MsgFieldPositionsFWVersions.START_POS_MAJOR:MsgFieldPositionsFWVersions.END_POS_MAJOR]))
         minor = struct.unpack('<B', bytearray(
-            message['message'][self.START_POS_MINOR:self.END_POS_MINOR]))
+            message['message'][MsgFieldPositionsFWVersions.START_POS_MINOR:MsgFieldPositionsFWVersions.END_POS_MINOR]))
         micro = struct.unpack('<B', bytearray(
-            message['message'][self.START_POS_MICRO:self.END_POS_MICRO]))
+            message['message'][MsgFieldPositionsFWVersions.START_POS_MICRO:MsgFieldPositionsFWVersions.END_POS_MICRO]))
         build = struct.unpack('<H', bytearray(
-            message['message'][self.START_POS_BUILD:self.END_POS_BUILD]))
+            message['message'][MsgFieldPositionsFWVersions.START_POS_BUILD:MsgFieldPositionsFWVersions.END_POS_BUILD]))
         compatibility = struct.unpack('<I', bytearray(
-            message['message'][self.START_POS_COMPATIBILITY_REV:self.END_POS_COMPATIBILITY_REV]))
+            message['message'][MsgFieldPositionsFWVersions.START_POS_COMPATIBILITY_REV:MsgFieldPositionsFWVersions.END_POS_COMPATIBILITY_REV]))
 
         self.ui_version_info_response_timestamp = 0
 
@@ -359,12 +359,47 @@
         @return: none
         """
 
-        message = DenaliMessage.build_message(channel_id=DenaliChannels.td_to_ui_ch_id,
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_td_ch_id,
                                               message_id=MsgIds.MSG_ID_TD_UI_VERSION_INFO_REQUEST.value)
 
         self.logger.debug("Sending an UI version request to the TD.")
         self.can_interface.send(message, 0)
 
+    def cmd_training_test_override(self, value: int, reset: int = NO_RESET) -> int:
+        """
+        Constructs and sends a training test override request to the TD.
+
+        @param value:  integer - test value to override with
+        @param reset:  integer - 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+
+        rst = integer_to_bytearray(reset)
+        val = integer_to_bytearray(value)
+        payload = rst + val
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_td_ch_id,
+                                              message_id=MsgIds.MSG_ID_TD_TRAINING_TEST_OVERRIDE_REQUEST.value,
+                                              payload=payload)
+
+        self.logger.debug("Sending a training test override request to the TD.")
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            # self.logger.debug(received_message)
+            if reset == RESET:
+                str_res = "reset back to normal: "
+            else:
+                str_res = str(val) + " value: "
+            self.logger.debug("Training test value overridden to " + str_res +
+                              str(received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]))
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
     def cmd_op_mode_broadcast_interval_override(self, ms: int, reset: int = NO_RESET) -> int:
         """
         Constructs and sends the measured op mode broadcast interval override command