package main

import (

    "fmt"

    "net"

    "time"

    "strconv"

)

func CheckError(err error) {

    if err  != nil {

        fmt.Println("Error: " , err)

    }

}

func main() {

    ServerAddr,err := net.ResolveUDPAddr("udp","127.0.0.1:10001")

    CheckError(err)

    LocalAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0")

    CheckError(err)

    Conn, err := net.DialUDP("udp", LocalAddr, ServerAddr)

    CheckError(err)

    defer Conn.Close()

    i := 0

    for {

        msg := strconv.Itoa(i)

        i++

        buf := []byte(msg)

        _,err := Conn.Write(buf)

        if err != nil {

            fmt.Println(msg, err)

        }

        time.Sleep(time.Second * 1)

    }

}

package main

import (

    "fmt"

    "net"

    "os"

)

/* A Simple function to verify error */

func CheckError(err error) {

    if err  != nil {

        fmt.Println("Error: " , err)

        os.Exit(0)

    }

}

func main() {

    /* Lets prepare a address at any address at port 10001*/   

    ServerAddr,err := net.ResolveUDPAddr("udp",":10001")

    CheckError(err)

    /* Now listen at selected port */

    ServerConn, err := net.ListenUDP("udp", ServerAddr)

    CheckError(err)

    defer ServerConn.Close()

    buf := make([]byte, 1024)

    for {

        n,addr,err := ServerConn.ReadFromUDP(buf)

        fmt.Println("Received ",string(buf[0:n]), " from ",addr)

        if err != nil {

            fmt.Println("Error: ",err)

        } 

    }

}