package main

import (
  "fmt"
  "log"
  "net"
)

func main() {
  udpServer, err := net.ListenPacket("udp", ":7777")
  if err != nil {
    log.Fatal(err)
  }
  defer udpServer.Close()

    fmt.Println("Server started on port 7777")

  for {
    buf := make([]byte, 1024)
    _, addr, err := udpServer.ReadFrom(buf)
    if err != nil {
      continue
    }
    go response(udpServer, addr, buf)
  }

}

func response(udpServer net.PacketConn, addr net.Addr, buf []byte) {
  fmt.Println(addr)
}