Index: dialin/dg/dialysate_generator.py
===================================================================
diff -u -r4e696543dce83e9ac7d469197b25dbf080e22e26 -r1695d3e7019ee94bb9072d08fc191b5b7e127992
--- dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision 4e696543dce83e9ac7d469197b25dbf080e22e26)
+++ dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision 1695d3e7019ee94bb9072d08fc191b5b7e127992)
@@ -140,6 +140,7 @@
         self.can_interface = DenaliCanMessenger(can_interface=can_interface,
                                                 logger=self.logger)
         self.can_interface.start()
+        self.callback_id = None
 
         # register handler for HD operation mode broadcast messages
         if self.can_interface is not None:
@@ -151,7 +152,7 @@
                                                                        MsgIds.MSG_ID_DG_VERSION.value,
                                                                        self._handler_dg_version)
 
-            self.can_interface.register_transmitting_interval_message(INTERVAL_10s,
+            self.callback_id = self.can_interface.register_transmitting_interval_message(INTERVAL_10s,
                                                                       self._send_dg_checkin_message)
 
         # initialize variables that will be populated by DG version response
@@ -206,6 +207,9 @@
         self.usage_record = DGUsageNVRecord(self.can_interface, self.logger)
         self.test_configs = DGTestConfig(self.can_interface, self.logger)
 
+    def __del__(self):
+        self.can_interface.transmit_interval_dictionary[self.callback_id].stop()
+
     def get_version(self):
         """
         Gets the DG version. Assumes DG version has already been requested.
@@ -340,6 +344,8 @@
             if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
                 self.logger.info("Successfully logged in to the DG.")
                 self.dg_set_logged_in_status(True)
+                self._send_dg_checkin_message()  # Timer starts interval first
+                self.can_interface.transmit_interval_dictionary[self.callback_id].start()
             else:
                 self.logger.error("Log In Failed.")
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
@@ -554,4 +560,4 @@
         """
         message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_dg_ch_id,
                                               message_id=MsgIds.MSG_ID_DG_DIALIN_CHECK_IN.value)
-        self.can_interface.send(message, 0)
\ No newline at end of file
+        self.can_interface.send(message)
\ No newline at end of file
Index: dialin/hd/hemodialysis_device.py
===================================================================
diff -u -r4e696543dce83e9ac7d469197b25dbf080e22e26 -r1695d3e7019ee94bb9072d08fc191b5b7e127992
--- dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 4e696543dce83e9ac7d469197b25dbf080e22e26)
+++ dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 1695d3e7019ee94bb9072d08fc191b5b7e127992)
@@ -105,7 +105,7 @@
         self.can_interface = DenaliCanMessenger(can_interface=can_interface,
                                                 logger=self.logger)
         self.can_interface.start()
-
+        self.callback_id = None
         # register handler for HD operation mode broadcast messages
         if self.can_interface is not None:
             channel_id = DenaliChannels.hd_sync_broadcast_ch_id
@@ -121,8 +121,8 @@
                                                                        MsgIds.MSG_ID_HD_UI_VERSION_INFO_RESPONSE.value,
                                                                        self._handler_ui_version_response_sync)
 
-            self.can_interface.register_transmitting_interval_message(INTERVAL_10s,
-                                                                      self._send_hd_checkin_message)
+            self.callback_id = self.can_interface.register_transmitting_interval_message(INTERVAL_10s,
+                                                                                        self._send_hd_checkin_message)
 
         # create properties
         self.hd_op_mode_timestamp = 0.0
@@ -178,6 +178,9 @@
         self.usage_record = HDUsageNVRecord(self.can_interface, self.logger)
         self.test_configs = HDTestConfig(self.can_interface, self.logger)
 
+    def __del__(self):
+        self.can_interface.transmit_interval_dictionary[self.callback_id].stop()
+
     def get_operation_mode(self):
         """
         Gets the HD operation mode
@@ -316,6 +319,8 @@
             if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
                 self.logger.debug("Success: Logged In")
                 self.hd_set_logged_in_status(True)
+                self._send_hd_checkin_message()  # Timer starts interval first
+                self.can_interface.transmit_interval_dictionary[self.callback_id].start()
             else:
                 self.logger.debug("Failure: Log In Failed.")
             return received_message['message'][DenaliMessage.PAYLOAD_START_INDEX]
@@ -743,4 +748,4 @@
         """
         message = DenaliMessage.build_message(channel_id=DenaliChannels.dialin_to_hd_ch_id,
                                               message_id=MsgIds.MSG_ID_HD_DIALIN_CHECK_IN.value)
-        self.can_interface.send(message, 0)
+        self.can_interface.send(message)
Index: dialin/protocols/CAN.py
===================================================================
diff -u -r4e696543dce83e9ac7d469197b25dbf080e22e26 -r1695d3e7019ee94bb9072d08fc191b5b7e127992
--- dialin/protocols/CAN.py	(.../CAN.py)	(revision 4e696543dce83e9ac7d469197b25dbf080e22e26)
+++ dialin/protocols/CAN.py	(.../CAN.py)	(revision 1695d3e7019ee94bb9072d08fc191b5b7e127992)
@@ -881,3 +881,5 @@
             self.transmit_interval_dictionary[function_id].start()
         else:
             self.transmit_interval_dictionary[function_id] = IntervalTimer(interval, function)
+
+        return function_id
Index: dialin/utils/base.py
===================================================================
diff -u -r4e696543dce83e9ac7d469197b25dbf080e22e26 -r1695d3e7019ee94bb9072d08fc191b5b7e127992
--- dialin/utils/base.py	(.../base.py)	(revision 4e696543dce83e9ac7d469197b25dbf080e22e26)
+++ dialin/utils/base.py	(.../base.py)	(revision 1695d3e7019ee94bb9072d08fc191b5b7e127992)
@@ -305,7 +305,6 @@
         self.args       = args
         self.kwargs     = kwargs
         self.is_running = False
-        self.start()
 
     def _run(self):
         self.is_running = False
@@ -320,3 +319,4 @@
 
     def stop(self):
         self._timer.cancel()
+        self.is_running = False