Temp_FLow_Controller subscribes to chamber state now. Code still needs to be tested though

util/temp_flow_controller.py

@@ -34,6 +34,7 @@ class tempFlowController:
         self.chamber_name = chamber_name
         self.delta = delta
         self.chamber_temperature_topic = "chambercontroller/"+chamber_name+"/current_temp"
+        self.chamber_state_topic = "chambercontroller/"+chamber_name+"/state"
         self.temperature_reached = Event() #set event flag to false
         self.client = paho.Client(client_id="chamber_controller_" + socket.gethostname(), clean_session=True)
         
@@ -47,6 +48,16 @@ class tempFlowController:
             temp, = struct.unpack("d", msg.payload)
             if abs(temp - self.target_temperature) < self.delta:
                 self.temperature_reached.set() #set the event flag to true
+                
+        elif msg.topic == self.chamber_state_topic:
+            state, = struct.unpack("i", msg.payload)
+            if state == 0:
+                self.logger.info("[on_message] connection to chamber lost")
+            elif state == 1:
+                self.logger.info("[on_message] connection to chamber established")
+                #republish target temp
+                self.client.publish("chamber/"+self.chamber_name+"/temp", struct.pack("d", self.target_temperature), qos=2)
+                
         else:
             self.logger.info("[on_message] {} {}".format(msg.payload, msg.topic))
 
@@ -56,6 +67,7 @@ class tempFlowController:
     def on_connect (self, client, userdata, flags, rc):
         self.logger.info("Connection established")
         client.subscribe(self.chamber_temperature_topic, qos=2)
+        client.subscribe(self.chamber_state_topic, qos=2)
 
     def set_temp (self, temp):
         self.client.publish("chamber/"+self.chamber_name+"/temp", struct.pack("d", temp), qos=2)