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。
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mqtt_client.py
# 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()
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发布/订阅测试
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# -*- 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()
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注解函数:
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client.connect( self , host, port, keepalive, bind_address)
client.publish( self , topic, payload, qos, retain)
client.subscribe( self , topic, qos)
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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。
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# 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()
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总结
以上所述是小编给大家介绍的使用python实现mqtt的发布和订阅,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
如果你觉得本文对你有帮助,欢迎转载,烦请注明出处,谢谢!原文链接:https://blog.csdn.net/xxmonstor/article/details/80479851