using System;

using System.Net.Sockets;

using System.Text;

using System.Threading.Tasks;

namespace UdpServer

{

class Program

{

const int listenPort = 30001;

static async Task Main(string[] args)

{

Console.WriteLine("*** Udp Sever ***");

UdpClient udpClient = new UdpClient(listenPort);

//UdpClient udpClient = new UdpClient(9999);

int count = 5;

while (count > 0)

{

var udpReceiveResult = await udpClient.ReceiveAsync();

var str = Encoding.ASCII.GetString(udpReceiveResult.Buffer);

var receiveStr = Encoding.ASCII.GetBytes("hello" + str);

await udpClient.SendAsync(receiveStr, receiveStr.Length, udpReceiveResult.RemoteEndPoint);

Console.WriteLine($"[{udpReceiveResult.RemoteEndPoint.ToString()}]{str}");

count--;

}

//Console.WriteLine("Hello World!");

}

}

}