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Advanced Techniques in Go Programming

Developing a UDP Server

Explore the development of a UDP server in Go that listens on a specified port and handles multiple clients concurrently. Learn to use net.ResolveUDPAddr and net.ListenUDP functions to create the server, manage data transfer with ReadFromUDP and WriteToUDP methods, and implement client-server communication protocols including termination via a STOP message. Understand how to build UDP client interactions and test your server effectively.

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This lesson shows us how to develop a UDP server, which generates and returns random numbers to its clients.

Coding example

The code for the UDP server (udpS.go) is as follows:

Go (1.19.0)
package main
import (
	"fmt"
	"math/rand"
	"net"
	"os"
	"strconv"
	"strings"
	"time"
)
func random(min, max int) int {
	return rand.Intn(max-min) + min
}
func main() {
	arguments := os.Args
	if len(arguments) == 1 {
		fmt.Println("Please provide a port number!")
		return
	}
	PORT := ":" + arguments[1]

The UDP port number the server is going to listen to is provided as a command-line argument.

Go (1.19.0)
	s, err := net.ResolveUDPAddr("udp4", PORT)
	if err != nil {
		fmt.Println(err)
		return
	}

The net.ResolveUDPAddr() function creates a UDP endpoint that is going to be used to create the server.

Go (1.19.0)
	connection, err := net.ListenUDP("udp4", s)
	if err != nil {
		fmt.Println(err)
		return
	}

The ...