title: How to Subscribe on Multiple topic using PAHO-MQTT on python
body: <p>I am trying to subscribe on three different topics using single subscriber client. But with the below mentioned code I am able to get data from only one server. 
  Please suggest ant modification in my code that can be implemented to get the desired data from the different publisher clients.</p>
  
  <pre><code># Define Variables
  MQTT_BROKER = "10.97.143.44"
  MQTT_PORT = 11883
  MQTT_TOPIC = [("Server1/kpi1"),("Server2/kpi2"),("Server3/kpi3")
  
  
  def on_connect(client, userdata, flags, rc):
      if rc == 0:
          print("Connected to broker")
          global Connected                #Use global variable
          Connected = True                #Signal connection
      else:
          print("Connection failed")
  
  def on_message(client, userdata, message):
      data = message.payload
      receive=data.decode("utf-8")
      m_decode = json.loads(receive)
      #print(m_decode)
      #print (m_decode['Server_name'])
      print ("Message received: "  + str(m_decode))
  
  
  Connected = False   #global variable for the state of the connection
  
  client = mqttClient.Client("Python")               #create new instance
  client.on_connect= on_connect                      #attach function to callback
  client.on_message= on_message                      #attach function to callback
  client.connect(MQTT_BROKER,MQTT_PORT)              #connect to broker         
  
  
  
  client.loop_start()        #start the loop
  
  while Connected != True:    #Wait for connection
  
      time.sleep(0.1)
  
  client.subscribe(MQTT_TOPIC)
  
  try:
  
      while True:
  
          time.sleep(1)
  
  except KeyboardInterrupt:
  
      print ("exiting")
  
  List item
  
      client.disconnect()
  
      client.loop_stop()
  </code></pre>