使用python实现mqtt的发布和订阅

mqtt_client.py# encoding: utf-8import paho.mqtt.client as mqttHOST = "101.200.46.138"PORT = 1883def test():  client = mqtt.Client()  client.connect(HOST, PORT, 60)  client.publish("chat","hello liefyuan",2) # 发布一个主题为'chat',内容为‘hello liefyuan'的信息  client.loop_forever()if __name__ == '__main__':  test()

# -*- coding: utf-8 -*-import paho.mqtt.client as mqttMQTTHOST = "101.200.46.138"MQTTPORT = 1883mqttClient = mqtt.Client()# 连接MQTT服务器def on_mqtt_connect():  mqttClient.connect(MQTTHOST, MQTTPORT, 60)  mqttClient.loop_start()# publish 消息def on_publish(topic, payload, qos):  mqttClient.publish(topic, payload, qos)# 消息处理函数def on_message_come(lient, userdata, msg):  print(msg.topic + " " + ":" + str(msg.payload))# subscribe 消息def on_subscribe():  mqttClient.subscribe("/server", 1)  mqttClient.on_message = on_message_come # 消息到来处理函数def main():  on_mqtt_connect()  on_publish("/test/server", "Hello Python!", 1)  on_subscribe()  while True:    passif __name__ == '__main__':  main()

client.connect(self, host, port, keepalive, bind_address)client.publish(self, topic, payload, qos, retain)client.subscribe(self, topic, qos)

# encoding: utf-8import paho.mqtt.client as mqttdef on_connect(client, userdata, flags, rc):  print("Connected with result code "+str(rc))  client.subscribe("chat")def on_message(client, userdata, msg):  print(msg.topic+" " + ":" + str(msg.payload))client = mqtt.Client()client.on_connect = on_connectclient.on_message = on_messageclient.connect("www.liefyuan.top", 1883, 60)client.loop_forever()