MQTT_Client实例Golang代码

package test

import (
    "fmt"
    "time"
    MQTT "github.com/eclipse/paho.mqtt.golang"
    LOG "github.com/sirupsen/logrus"
)

func main() {
    opts := MQTT.NewClientOptions()
    opts.AddBroker("tcp://127.0.0.1:1883")
    opts.SetClientID("custom-store")

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

    c := MQTT.NewClient(opts)
    if token := c.Connect(); token.Wait() && token.Error() != nil {
        panic(token.Error())
    }
    LOG.Info("create mqtt client")

    c.Subscribe("/go-mqtt/sample", 0, callback)
    LOG.Info("subscibe topic /go-mqtt/sample")
    for i := 0; i < 10; i++ {
        text := fmt.Sprintf("this is msg #%d!", i)
        token := c.Publish("/go-mqtt/sample", 1, false, text)
        token.Wait()
    }

    for i := 1; i < 10; i++ {
        time.Sleep(1 * time.Second)
    }
    c.Disconnect(250)
}