golang使用mqtt协议_golang setdefaultpublishhandler

1. 部署开源emqx Broker

 mongodb:
    container_name: mongodb
    image: mongo:5.0.10
    restart: always
    ports:
      - 27017:27017
    command: mongod --auth
    volumes:
      - /www/conf/mongodb/data:/data/db
      - /www/conf/mongodb/log:/var/log/mongodb
      - /www/conf/mongodb/config:/etc/mongo
    networks:
      - mynet
  emqx:
    container_name: emqx
    image: emqx/emqx:5.0.0
    restart: always
    ports:
      - 1883:1883
      - 8083:8083
      - 8883:8883
      - 8084:8084
      - 18083:18083
    environment:
      - EMQX_DASHBOARD__DEFAULT_USER__LOGIN=root
      - EMQX_DASHBOARD__DEFAULT_USER__PASSWORD=root@2022
      - EMQX_NODE__MAX_PORTS=65535
      - EMQX_MQTT__MAX_PACKET_SIZE=16MB
    healthcheck:
      test: ["CMD", "/opt/emqx/bin/emqx_ctl", "status"]
      interval: 5s
      timeout: 25s
      retries: 5
    volumes:
      - /www/conf/emqx/data:/opt/emqx/data
    networks:
      - mynet
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2.运行docker-compose up -d
3.访问127.0.0.1:18083 默认账号：admin 密码 :public
4.设置中英文

5.设置mongodb 认证

db.users.insertOne(
  {
      "username": "user123",
      "s": "salt",
      "is": true,
      "ph": "bede90386d450cea8b77b822f8887065e4e5abf132c2f9dccfcc7fbd4cba5e35"
  }
);
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2. golang 客户端连接

package main

import (
	"fmt"
	mqtt "github.com/eclipse/paho.mqtt.golang"
	"time"
)

var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
	fmt.Printf("Received message: %s from topic: %s\n", msg.Payload(), msg.Topic())
}

var connectHandler mqtt.OnConnectHandler = func(client mqtt.Client) {
	fmt.Println("Connected")
}

var connectLostHandler mqtt.ConnectionLostHandler = func(client mqtt.Client, err error) {
	fmt.Printf("Connect lost: %v", err)
}


func main() {
	var broker = "127.0.0.1"
	var port = 1883
	opts := mqtt.NewClientOptions()
	opts.AddBroker(fmt.Sprintf("tcp://%s:%d", broker, port))
	opts.SetClientID("mqttx_4102ff83sss")
	opts.SetUsername("user123")
	opts.SetPassword("secret")
	opts.SetDefaultPublishHandler(messagePubHandler)
	opts.OnConnect = connectHandler
	opts.OnConnectionLost = connectLostHandler
	client := mqtt.NewClient(opts)
	if token := client.Connect(); token.Wait() && token.Error() != nil {
	//	panic(token.Error())
		fmt.Println("ddd")
	}

	sub(client)
	publish(client)

	client.Disconnect(250)
}

// 发布消息
func publish(client mqtt.Client) {
	num := 10
	for i := 0; i < num; i++ {
		text := fmt.Sprintf("Message %d", i)
		token := client.Publish("topic/test", 0, false, text)
		token.Wait()
		time.Sleep(time.Second)
	}
}

// 订阅
func sub(client mqtt.Client) {
	topic := "topic/test"
	token := client.Subscribe(topic, 1, nil)
	token.Wait()
	fmt.Printf("Subscribed to topic: %s", topic)
}
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