test.go

package main

import (
	"fmt"
	"net"
	"os"
	"time"
)

const udpAddr = "127.0.0.1:10000"

func main() {
	addr, err := net.ResolveUDPAddr("udp", udpAddr)
	if err != nil {
		panic(err)
	}
	udpConn, err := net.ListenUDP("udp", addr)
	if err != nil {
		fmt.Printf("Failed to start UDP listener. Err: %s\n", err)
		os.Exit(1)
	}

	go send(udpConn)
	go recv(udpConn)
	select {}
}

func send(udpConn *net.UDPConn) {
	addr, err := net.ResolveUDPAddr("udp", udpAddr)
	if err != nil {
		panic(err)
	}
	for {
		_, err := udpConn.WriteTo([]byte("ping"), addr)
		if err != nil {
			fmt.Printf("[ERR] Error sending UDP packet: %s\n", err)
		}
		time.Sleep(time.Second)
	}
}

func recv(udpConn *net.UDPConn) {
	buf := make([]byte, 64*1024)
	for {
		n, addr, err := udpConn.ReadFrom(buf)
		if err != nil {
			fmt.Printf("[ERR] Error reading UDP packet: %s\n", err)
		}
		fmt.Printf("[INFO] Packet from %v %d\n", addr, n)
	}
}