Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -r9f86c313a673e05e82c6b82fc8b6d60c78a94f67 -r37713699423a2fb9343fca8f1fdf2ccdfe50a16d
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 9f86c313a673e05e82c6b82fc8b6d60c78a94f67)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision 37713699423a2fb9343fca8f1fdf2ccdfe50a16d)
@@ -15,6 +15,7 @@
 ############################################################################
 import enum
 from time import sleep
+from typing import Callable
 
 from . import messageBuilder
 from ..common import *
@@ -54,8 +55,7 @@
         super().__init__()
         HDSimulator.instance_count = HDSimulator.instance_count + 1
 
-        self.checked_in = False
-        self.checked_in_last = 0
+        self.auto_response = auto_response
         self._log_manager = LogManager(log_level=log_level, log_filepath=self.__class__.__name__ + ".log")
         self.logger = self._log_manager.logger
         self.console_out = console_out
@@ -109,6 +109,24 @@
         # initialize variables that will be populated by UI version response
         self.ui_version = None
 
+    def add_publication(self, channel_id: DenaliChannels, message_id: MsgIds, function_ptr: Callable) -> None:
+        """
+        Allows later addition of publication to the HDSimulator
+        @param channel_id: (DenaliChannels) the channel id of the message
+        @param message_id: (MsgIds) the message id
+        @param function_ptr: (Callable) the pointer to the message handler function
+        @return: None
+        """
+        if self.auto_response:
+            if channel_id > 0 and message_id != MsgIds.MSG_ID_UNUSED and function_ptr is not None:
+                self.can_interface.register_receiving_publication_function(channel_id,
+                                                                           message_id,
+                                                                           function_ptr)
+            else:
+                self.logger.debug("rejected publication registration {0}, {1}, {2}".format(channel_id,
+                                                                                           message_id,
+                                                                                           function_ptr))
+
     def get_ui_version(self):
         """
         Gets the ui version
@@ -310,31 +328,6 @@
 
         self.cmd_send_uf_treatment_response(1, 0, uf_volume)
 
-    def _handler_ui_first_check_in(self, message) -> None:
-        """
-        Handler function to first check in to start the post
-        @param message: the check-in message
-        @return: None
-        """
-        now = time.time()
-        # if the application is not checking-in (the simulator ) within 2 sec it means it has been stopped,
-        # so do the check-in again.
-        if now - self.checked_in_last > 5:
-            self.checked_in = False
-
-        self.checked_in_last = now
-
-        if self.checked_in:
-            return
-
-        self.cmd_send_power_on_self_test_version_request()
-        for i in range(20):
-            self.cmd_send_hd_post(i, True, False)
-            sleep(0.1)
-        self.cmd_send_hd_post(0, True, True)
-        self.cmd_send_hd_operation_mode(4, 0)
-        self.checked_in = True
-
     def _handler_ui_initiate_treatment(self, message):
         """
         Handler function to start a treatment
@@ -1328,6 +1321,7 @@
 
         payload = float_to_bytearray(target)
         payload += float_to_bytearray(current)
+        payload += float_to_bytearray(0)
 
         message = DenaliMessage.build_message(channel_id=DenaliChannels.hd_to_ui_ch_id,
                                               message_id=MsgIds.MSG_ID_HD_BLOOD_PRIME_PROGRESS.value,