MQTT协议 Python客户端

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【本文出处: http://blog.csdn.net/leytton/article/details/52782523】

1、安装模块

paho.mqtt.python开源地址：https://github.com/eclipse/paho.mqtt.python

下载并解压，打开目录执行命令安装模块

python setup.py install

2、Python代码

import paho.mqtt.client as mqtt# 当连接上服务器后回调此函数def on_connect(client, userdata, flags, rc):    print("Connected with result code "+str(rc))    # 放在on_connect函数里意味着    # 重新连接时订阅主题将会被更新    client.subscribe("topic/sub")# 从服务器接受到消息后回调此函数def on_message(client, userdata, msg):    print("主题:"+msg.topic+" 消息:"+str(msg.payload))client = mqtt.Client()#参数有 Client(client_id="", clean_session=True, userdata=None, protocol=MQTTv311, transport="tcp")client.on_connect = on_connect #设置连接上服务器回调函数client.on_message = on_message  #设置接收到服务器消息回调函数client.connect("iot.eclipse.org", 1883, 60)  #连接服务器,端口为1883,维持心跳为60秒client.loop_forever()

3、其他接口

client.disconnect() #断开连接client.publish(topic, payload=None, qos=0, retain=False) #发布消息def on_disconnect(client, userdata, rc):    if rc != 0:print("Unexpected disconnection.")mqttc.on_disconnect = on_disconnect ##设置与服务器断开连接回调函数def on_publish(client, userdata, mid): #发布消息完成回调函数...

4、参考文献

paho.mqtt.python开源地址：https://github.com/eclipse/paho.mqtt.python

附各客户端项目地址:http://www.eclipse.org/paho/downloads.php

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