Index: dialin/common/msg_ids.py
===================================================================
diff -u -r4a0c6600b52ec965a6625a428de986e7040ae2c9 -r9c740ce9dd2c7353eadc4d494f51a24157486ea7
--- dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 4a0c6600b52ec965a6625a428de986e7040ae2c9)
+++ dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 9c740ce9dd2c7353eadc4d494f51a24157486ea7)
@@ -370,6 +370,10 @@
     MSG_ID_HD_DIAL_OUT_PUMP_HARD_STOP = 0x8090
     MSG_ID_HD_BLOOD_PUMP_HARD_STOP = 0x8091
     MSG_ID_HD_DIALIN_CHECK_IN = 0x8092
+    MSG_ID_HD_SET_TEST_CONFIGURATION = 0x8093
+    MSG_ID_HD_GET_TEST_CONFIGURATION = 0x8094
+    MSG_ID_HD_SEND_TEST_CONFIGURATION = 0x8095
+    MSG_ID_HD_RESET_ALL_TEST_CONFIGURATIONS = 0x8096
 
     MSG_ID_DG_TESTER_LOGIN_REQUEST = 0xA000
     MSG_ID_DG_ALARM_STATE_OVERRIDE = 0xA001
Index: dialin/common/test_config_defs.py
===================================================================
diff -u -r4a0c6600b52ec965a6625a428de986e7040ae2c9 -r9c740ce9dd2c7353eadc4d494f51a24157486ea7
--- dialin/common/test_config_defs.py	(.../test_config_defs.py)	(revision 4a0c6600b52ec965a6625a428de986e7040ae2c9)
+++ dialin/common/test_config_defs.py	(.../test_config_defs.py)	(revision 9c740ce9dd2c7353eadc4d494f51a24157486ea7)
@@ -29,5 +29,6 @@
 
 @unique
 class HDTestConfigOptions(DialinEnum):
-    pass
-    # TODo update
+    TEST_CONFIG_ENABLE_WET_CARTRIDGE_USE = 0                      # Test configuration enable mixing with water.
+    # TEST_CONFIG_FIRST = TEST_CONFIG_ENABLE_MIXING_WITH_WATER,   # Test configuration first configuration.
+    NUM_OF_TEST_CONFIGS = 1
Index: dialin/hd/hd_test_configs.py
===================================================================
diff -u
--- dialin/hd/hd_test_configs.py	(revision 0)
+++ dialin/hd/hd_test_configs.py	(revision 9c740ce9dd2c7353eadc4d494f51a24157486ea7)
@@ -0,0 +1,157 @@
+
+
+from logging import Logger
+from ..common.msg_defs import MsgIds, MsgFieldPositions
+from ..common.test_config_defs import HDTestConfigOptions
+from ..protocols.CAN import DenaliMessage, DenaliChannels
+from .constants import NO_RESET
+from ..utils.conversions import integer_to_bytearray, bytearray_to_integer
+from ..utils.base import AbstractSubSystem, publish
+
+
+class HDTestConfig(AbstractSubSystem):
+    """
+
+    Hemodialysis (HD) Dialin API sub-class for setting and getting the test configurations.
+    """
+
+    def __init__(self, can_interface, logger: Logger):
+        """
+
+        @param can_interface: Denali CAN Messenger object
+        """
+        super().__init__()
+
+        self.can_interface = can_interface
+        self.logger = logger
+        self.hd_test_configs = dict()
+        self.hd_test_configs_response_timestamp = 0.0
+
+        self._reset_test_configs_record()
+
+        if self.can_interface is not None:
+            channel_id = DenaliChannels.dialin_to_hd_ch_id
+            msg_id = MsgIds.MSG_ID_HD_SEND_TEST_CONFIGURATION.value
+            self.can_interface.register_receiving_publication_function(channel_id, msg_id,
+                                                                       self._handler_test_config_sync)
+
+    def cmd_get_test_config_status(self, config: int):
+        """
+        Returns the status of a test config
+
+        @param config: (int) Test config to set
+        @return: the status of a test config
+        """
+        return self.hd_test_configs[HDTestConfigOptions(config).name]
+
+    def cmd_set_test_config(self, config: int, reset: int = NO_RESET):
+        """
+        Constructs and sends the HD test config
+        Constraints:
+            Must be logged into HD.
+
+        @param config: (int) Test config to set
+        @param reset: (int) 1 to reset a previous override, 0 to override
+        @return: 1 if successful, zero otherwise
+        """
+        reset_value = integer_to_bytearray(reset)
+        c = integer_to_bytearray(config)
+        payload = reset_value + c
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_SET_TEST_CONFIGURATION.value,
+                                              payload=payload)
+
+        if reset == NO_RESET:
+            self.logger.debug("Setting {}".format(HDTestConfigOptions(config).name))
+        else:
+            self.logger.debug("Resetting {}".format(HDTestConfigOptions(config).name))
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is no content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
+    def cmd_request_test_config_status_from_fw(self):
+        """
+        Constructs and sends the HD test configs request
+        Constraints:
+            Must be logged into HD.
+
+        @return: 1 if successful, zero otherwise
+        """
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_GET_TEST_CONFIGURATION.value)
+
+        self.logger.debug('Getting HD test configuration record')
+
+        received_message = self.can_interface.send(message)
+
+        # If there is content...
+        if received_message is not None:
+            self._reset_test_configs_record()
+            self.logger.debug("Received FW ACK after requesting HD test configuration record.")
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
+    def cmd_reset_all_test_configs(self):
+        """
+        Constructs and sends the HD test configs reset all
+        Constraints:
+            Must be logged into HD.
+
+        @return: 1 if successful, zero otherwise
+        """
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                              message_id=MsgIds.MSG_ID_HD_RESET_ALL_TEST_CONFIGURATIONS.value)
+
+        self.logger.debug("Resetting all HD test configurations")
+
+        # Send message
+        received_message = self.can_interface.send(message)
+
+        # If there is no content...
+        if received_message is not None:
+            # response payload is OK or not OK
+            return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
+        else:
+            self.logger.debug("Timeout!!!!")
+            return False
+
+    @publish(['hd_test_configs'])
+    def _handler_test_config_sync(self, message, timestamp=0.0):
+        """
+        Handles published test configuration status messages.
+
+        @param message:  published HD test configurations message
+        @return: None
+        """
+        payload = message['message']
+        index = MsgFieldPositions.START_POS_FIELD_1
+
+        for config in HDTestConfigOptions.__members__:
+            if 'NUM_OF_TEST_CONFIGS' not in config:
+                config_value, index = bytearray_to_integer(payload, index, False)
+                self.hd_test_configs[config] = config_value
+
+        self.hd_test_configs_response_timestamp = timestamp
+
+    def _reset_test_configs_record(self):
+        """
+        Resets the test configuration dictionary
+
+        @return: None
+        """
+        for config in HDTestConfigOptions.__members__:
+            # Loop through the list of the test configuration and set the values to 0xFFFFFFFF
+            if 'NUM_OF_TEST_CONFIGS' not in config:
+                self.hd_test_configs[config] = 0xFFFFFFFF