Python MQTT客户端实现

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1.安装paho-mqtt

使用Python Package Index (PyPi)

pip install paho-mqtt

使用virtualenv

virtualenv paho-mqttsource paho-mqtt/bin/activatepip install paho-mqtt

或者编译源代码

git clone https://github.com/eclipse/paho.mqtt.python

使用源码安装

cd paho.mqtt.pythonpython setup.py install

2. Demo

接收数据

import paho.mqtt.client as mqttimport timeHOST = "127.0.0.1"PORT = 61613def client_loop():    client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))    client = mqtt.Client(client_id)    # ClientId不能重复，所以使用当前时间    client.username_pw_set("admin", "123456")  # 必须设置，否则会返回「Connected with result code 4」    client.on_connect = on_connect    client.on_message = on_message    client.connect(HOST, PORT, 60)    client.loop_forever()def on_connect(client, userdata, flags, rc):    print("Connected with result code "+str(rc))    client.subscribe("test")def on_message(client, userdata, msg):    print(msg.topic+" "+msg.payload.decode("utf-8"))if __name__ == '__main__':    client_loop()

注意，client_id是必须的，并且是唯一的。否则可能会出现如下错误：

[WinError 10054] 远程主机强迫关闭了一个现有的连接。

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发布数据

# import paho.mqtt.client as mqttimport paho.mqtt.publish as publishimport timeHOST = "127.0.0.1"PORT = 61613def on_connect(client, userdata, flags, rc):    print("Connected with result code "+str(rc))    client.subscribe("test")def on_message(client, userdata, msg):    print(msg.topic+" "+msg.payload.decode("utf-8"))if __name__ == '__main__':    client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))    # client = mqtt.Client(client_id)    # ClientId不能重复，所以使用当前时间    # client.username_pw_set("admin", "123456")  # 必须设置，否则会返回「Connected with result code 4」    # client.on_connect = on_connect    # client.on_message = on_message    # client.connect(HOST, PORT, 60)    # client.publish("test", "你好 MQTT", qos=0, retain=False)  # 发布消息    publish.single("test", "你好 MQTT", qos = 1,hostname=HOST,port=PORT, client_id=client_id,auth = {'username':"admin", 'password':"123456"})

3.结果

接收

发送

Reference
https://pypi.python.org/pypi/paho-mqtt

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