Index: dialin/common/msg_defs.py
===================================================================
diff -u -r8ea13ae6dd10732bfcc456798f4785c4d88c95d3 -r120e6925083c799b20143834e431bdc9f34c3687
--- dialin/common/msg_defs.py	(.../msg_defs.py)	(revision 8ea13ae6dd10732bfcc456798f4785c4d88c95d3)
+++ dialin/common/msg_defs.py	(.../msg_defs.py)	(revision 120e6925083c799b20143834e431bdc9f34c3687)
@@ -161,6 +161,7 @@
     MSG_ID_HEAT_DISINFECT_RSRVR2_TO_RSRVR1_DURATION_MINS = 0xA01F    # Heat disinfection reservoir 2 to reservoir 1 duration in minutes
     MSG_ID_HEAT_DISINFECT_NO_OF_CYCLES_TO_RUN = 0xA020          # Heat disinfection number of cycles to run
     MSG_ID_HEAT_DISINFECT_PUBLISH_INTERVAL_OVERRIDE = 0xA021    # Heat disinfection data publish interval override request
+    MSG_ID_PRIMING_STATUS = 0xA022                              # The priming status
 
     MSG_ID_HD_DEBUG_EVENT = 0xFFF1                              # HD debug event text to be logged in event log
     MSG_ID_DG_DEBUG_EVENT = 0xFFF2                              # DG debug event text to be logged in event log
Index: dialin/ui/hd_proxy.py
===================================================================
diff -u -r8ea13ae6dd10732bfcc456798f4785c4d88c95d3 -r120e6925083c799b20143834e431bdc9f34c3687
--- dialin/ui/hd_proxy.py	(.../hd_proxy.py)	(revision 8ea13ae6dd10732bfcc456798f4785c4d88c95d3)
+++ dialin/ui/hd_proxy.py	(.../hd_proxy.py)	(revision 120e6925083c799b20143834e431bdc9f34c3687)
@@ -114,3 +114,21 @@
 
         self.can_interface.send(message, 0)
 
+
+    def cmd_send_priming_time_remaining(self, state, seconds_remaining, seconds_total):
+        """
+        Broadcasts the number of seconds remaining in priming to the UI
+
+        @return: None
+        """
+
+        payload = bytearray()
+        payload += integer_to_bytearray(state)
+        payload += integer_to_bytearray(seconds_remaining)
+        payload += integer_to_bytearray(seconds_total)
+
+        message = DenaliMessage.build_message(channel_id=DenaliChannels.hd_sync_broadcast_ch_id,
+                                              message_id=MsgIds.MSG_ID_PRIMING_STATUS.value,
+                                              payload=payload)
+
+        self.can_interface.send(message, 0)
Index: tests/test_hd_simulator.py
===================================================================
diff -u -r8ea13ae6dd10732bfcc456798f4785c4d88c95d3 -r120e6925083c799b20143834e431bdc9f34c3687
--- tests/test_hd_simulator.py	(.../test_hd_simulator.py)	(revision 8ea13ae6dd10732bfcc456798f4785c4d88c95d3)
+++ tests/test_hd_simulator.py	(.../test_hd_simulator.py)	(revision 120e6925083c799b20143834e431bdc9f34c3687)
@@ -107,13 +107,26 @@
     ]
     hd_simulator.cmd_send_treatment_parameter_validation_response(rejections)
 
+def test_priming():
+    hd_simulator = HDSimulator(log_level="DEBUG")
+    state = 0
+    total_seconds = 100
+    for seconds_remaining in range(total_seconds, -1, -1):
+        if seconds_remaining % (total_seconds // 3) == 0:
+            state += 1
+        hd_simulator.cmd_send_priming_time_remaining(state, seconds_remaining, total_seconds)
+        sleep(0.05)
 
+
+
 if __name__ == '__main__':
     # test_clear_alarms()
     # sleep(1)
     # test_poweroff()
-    test_valid_parameters()
+    # test_valid_parameters()
+    test_priming()
 
 
 
 
+