Python MQTT客户端实现
1.安装paho-mqtt
使用Python Package Index (PyPi)
pip install paho-mqtt
使用virtualenv
virtualenv paho-mqtt
source paho-mqtt/bin/activate
pip 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.python
python setup.py install
2. Demo
发布数据
# import paho.mqtt.client as mqtt import paho.mqtt.publish as publish import time HOST = "127.0.0.1" PORT = 61613 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_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"})
接收数据
import paho.mqtt.client as mqtt import time HOST = "127.0.0.1" PORT = 61613 def 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()
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。