需要安装的python库 使用python编写程序进行测试MQTT的发布和订阅功能。首先要安装:pip install paho-mqtt 测试发布（pub） 我的MQTT部署在阿里云的服务器上面，所以我在本机上编写了python程序进行测试。 然后在shell里面重新打开一个终端，订阅一个主题为“chat” mosquitto_sub -t chat 在本机上测试远程的MQTT的发布功能就是把自己作为一个发送信息的人，当自己发送信息的时候，所有订阅过该主题（topic）的对象都将收到自己发送的信息。 mqtt_client.py
代码语言：javascript复制# encoding: utf-8
import paho.mqtt.client as mqtt
HOST = "101.200.46.138"
PORT = 1883
def 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()发布/订阅测试
代码语言：javascript复制# -*- coding: utf-8 -*-
import paho.mqtt.client as mqtt
MQTTHOST = "101.200.46.138"
MQTTPORT = 1883
mqttClient = 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:
pass
if __name__ == '__main__':
main()
注解函数： client.connect(self, host, port, keepalive, bind_address) client.publish(self, topic, payload, qos, retain) client.subscribe(self, topic, qos) 测试订阅（sub） 在本机上编写程序测试订阅功能，就是让自己的程序作为一个接收者，同一个主题没有发布（pub）信息的时候，就自己一直等候。
代码语言：javascript复制# encoding: utf-8
import paho.mqtt.client as mqtt
def 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_connect
client.on_message = on_message
client.connect("www.liefyuan.top", 1883, 60)
client.loop_forever()
