最简单mqtt协议客户端实现

懒得写介绍了，直接放代码，给自己看的！

/*
@Time : 2020/8/24 13:48
@Author : xd
@File : main.go
@Software: GoLand
*/
package main

import (
	"fmt"
	MQTT "github.com/eclipse/paho.mqtt.golang"
	"github.com/gogf/gf/os/glog"
	"github.com/gogf/gf/os/gtime"
	"time"
)

func main()  {
    
    
	opts := MQTT.NewClientOptions()
	opts.AddBroker("tcp://broker.emqx.io:1883")
	opts.SetClientID("custom-store")

	var callback MQTT.MessageHandler = func(client MQTT.Client, msg MQTT.Message) {
    
    
		fmt.Printf("主题TOPIC: %s\n", msg.Topic())
		glog.Info("MSG: ", msg.Payload())
	}

	c := MQTT.NewClient(opts)
	if token := c.Connect(); token.Wait() && token.Error() != nil {
    
    
		panic(token.Error())
	}

	c.Subscribe("$delayed/3/sample", 2, callback)

	for i := 0; i < 5; i++ {
    
    
		t := gtime.Now()
		token := c.Publish("$delayed/3/sample", 2, false,  t.Format("H:i:s.u"))
		token.Wait()
	}
	for i := 1; i < 5; i++ {
    
    
		time.Sleep(1 * time.Second)
	}

	c.Disconnect(10*1000)
}