setup auto reconnect to mqtt broker

relay.py

@@ -10,9 +10,10 @@ port = 1883
 topic_sensor = 'garage/door_sensor'
 topic_control = 'garage/door_control'
 client_id = str(210)
-BUTTON_TIME=1  #seconds
+BUTTON_TIME=0.75  #seconds
 
 RUN=1
+CONNECTED = 0
 
 #GPIO settings
 relay_pin = 15
@@ -35,9 +36,16 @@ def mqtt_on_message(client, userdata, msg):
     #    end()
     #    client.loop_stop()
 
+def mqtt_on_disconnect(client, userdata, rc):
+    global CONNECTED
+    print("RELAY: LOST CONNECTION")
+    CONNECTED=0
+
 def mqtt_on_connect(client, userdata, flags, rc):
+    global CONNECTED
     if rc == 0:
         print("Connected to MQTT Broker")
+        CONNECTED=1
     else:
         print("Failed to Connect MQTT")
 
@@ -47,6 +55,7 @@ def mqtt_setup():
     client = mqtt_client.Client(client_id)
     #client.username_pw_set(uname,pw)
     client.on_connect = mqtt_on_connect
+    client.on_disconnect = mqtt_on_disconnect
     while(1): # keep trying until the network is up
         try:
             client.connect(broker,port,keepalive=60)
@@ -61,7 +70,8 @@ def mqtt_setup():
     return client
 
 def publish_status(client):
-    client.publish(topic_sensor,str(get_sensor()),retain=True)
+    #client.publish(topic_sensor,str(get_sensor()),retain=True)
+    client.publish(topic_sensor,str(get_sensor()))
 
 def set_relay(value):
     if value==1:
@@ -88,7 +98,14 @@ def main():
     publish_status(client)
     while(RUN):
         time.sleep(5)
+        #print("CONNECTED:",CONNECTED)
         publish_status(client)
+        if CONNECTED==0:
+            print("RELAY: Attempting reconnect")
+            try:
+                client.reconnect()
+            except:
+                print("Failed to reconnect")
     gpio.cleanup()
     exit()