Golang/MQTT JSON server timestamp

server-main.go

package main

import (
  "fmt"
  "encoding/json"
  "os"
  "time"

  MQTT "github.com/eclipse/paho.mqtt.golang"
)

type serverInfo struct {
    Timestamp string `json:"timestamp"`
}

func main() {

  opts := MQTT.NewClientOptions().AddBroker("tcp://BROKER_ADDRESS:PORT")
  opts.SetClientID("CLIENT_ID")

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

  ticker := time.NewTicker(time.Millisecond * 1000)
  go func() {
    for timestamp := range ticker.C {
      message := serverInfo{Timestamp:timestamp.Format("2006-01-02T15:04:05")}
      messageJSON, err := json.Marshal(message)
      if err != nil {
        fmt.Println(err)
        os.Exit(1)
      }
      token := c.Publish("TOPIC", 0, false, messageJSON)
      token.Wait()
    }
  }()

  select {}

}