Index: HemodialysisDevice.py
===================================================================
diff -u -raef4802f8270da7b77751fd8e5b774f3ece46799 -r0eeccd940ecf398d84223dace0ca8bb8ccabf7c9
--- HemodialysisDevice.py	(.../HemodialysisDevice.py)	(revision aef4802f8270da7b77751fd8e5b774f3ece46799)
+++ HemodialysisDevice.py	(.../HemodialysisDevice.py)	(revision 0eeccd940ecf398d84223dace0ca8bb8ccabf7c9)
@@ -57,6 +57,7 @@
         self.Pressure_Occlusion = HD.HD_Pressure_Occlusion(self, self.can_interface)
         self.RTC = HD.HD_RTC(self, self.can_interface)
         self.Treatment = HD.HD_Treatment(self, self.can_interface)
+        self.UI = HD.HD_UI(self)
         self.Watchdog = HD.HD_Watchdog(self)
         ## DialOut is an HD_DialOutFlow object
        # self.DialOut = HD_DialOut(self.can_interface)
@@ -241,6 +242,46 @@
                 print("Timeout!!!!")
                 return False
 
+    class HD_UI:
+        """
+            \class HD_UI
+
+            \brief Hemodialysis Device (HD) Dialin API sub-class for UI commands.
+        """
+
+        # UI message IDs
+        MSG_ID_UI_CHECKIN_WITH_HD = 0x0007
+
+        def __init__(self, outer_instance):
+            self.outer_instance = outer_instance
+
+        """
+            HD_UI constructor 
+
+            \param outer_instance: reference to the HD (outer) class.
+
+            \returns HD_UI object.
+        """
+
+        def CmdUICheckinWithHD(self):
+            """
+                Constructs and sends the UI checkin message
+
+                \returns 1 if successful, zero otherwise
+            """
+
+            payload = None
+
+            message = DenaliMessage.buildMessage(channel_id=DenaliChannels.dialin_to_hd_ch_id,
+                                                 message_id=self.MSG_ID_UI_CHECKIN_WITH_HD)
+
+            print("Sending UI checkin w/ HD")
+
+            # Send message
+            received_message = self.outer_instance.can_interface.send(message, 0)
+
+            return 0
+
     class HD_Watchdog:
         """
             \class HD_Watchdog