paho mqtt python ejemplo

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Ejemplo 1: instalar paho mqtt client raspberry pi

pip3 install paho-mqtt

Ejemplo 2: mqtt paho

import paho.mqtt.client as mqtt
# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))# Subscribing in on_connect() means that if we lose the connection and# reconnect then subscriptions will be renewed.
    client.subscribe("$SYS/#")# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect("mqtt.eclipse.org", 1883, 60)# Blocking call that processes network traffic, dispatches callbacks and# handles reconnecting.# Other loop*() functions are available that give a threaded interface and a# manual interface.
client.loop_forever()# Non blocking : client.loop_start()  N.B. need a while True: statement

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