mqtt简介

import paho.mqtt.client as mqtt


def (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("TEST")

# 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("test.mosquitto.org", 1883, 60)
client.connect("test.mosquitto.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()

import paho.mqtt.client as mqtt

client = mqtt.Client()
client.connect("test.mosquitto.org", 1883, 60)
print("here")
client.publish("TEST","This is a test message.")
client.disconnect()