paho-mqtt 入门

原创于 2018-04-10 20:41:47 发布 · 8.4k 阅读

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本文介绍如何使用Python的paho-mqtt库实现MQTT客户端，包括安装库、定义连接及消息回调函数、订阅主题和接收消息等关键步骤。

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安装：

pip install paho-mqtt 或 pip3 install paho-mqtt

例子：

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, 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("iot.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()

待续...

参考：https://www.hivemq.com/blog/mqtt-client-library-paho-python