Exemplo Cliente Subscribe MQTT - Python

mqttSubscribeExample.py

#!/usr/bin/python
import paho.mqtt.client as mqttClient
import time
 
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):
    print "Message received: "  + message.payload
 
Connected = False   #global variable for the state of the connection
 
#broker_address= "m11.cloudmqtt.com"  #Broker address
broker_address = "localhost"
port = 1883                           #Broker port
#user = "yourUser"                    #Connection username
#password = "yourPassword"            #Connection password
 
client = mqttClient.Client("PythonMQTT")               #create new instance
#client.username_pw_set(user, password=password)    #set username and password
client.on_connect= on_connect                      #attach function to callback
client.on_message= on_message                      #attach function to callback
 
client.connect(broker_address, port=port)          #connect to broker
 
client.loop_start()        #start the loop
 
while Connected != True:    #Wait for connection
    time.sleep(0.1)
 
client.subscribe("iseed/test")
 
try:
    while True:
        time.sleep(1)
 
except KeyboardInterrupt:
    print "exiting"
    client.disconnect()
    client.loop_stop()