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using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using NetCoreServer;
namespace UdpEchoServer
{
class EchoServer : UdpServer
{
public EchoServer(IPAddress address, int port) : base(address, port) {}
protected override void OnStarted()
{
// Start receive datagrams
ReceiveAsync();
}
protected override void OnReceived(EndPoint endpoint, byte[] buffer, long offset, long size)
{
Console.WriteLine("Incoming: " + Encoding.UTF8.GetString(buffer, (int)offset, (int)size));
// Echo the message back to the sender
SendAsync(endpoint, buffer, 0, size);
}
protected override void OnSent(EndPoint endpoint, long sent)
{
// Continue receive datagrams
ReceiveAsync();
}
protected override void OnError(SocketError error)
{
Console.WriteLine($"Echo UDP server caught an error with code {error}");
}
}
class Program
{
static void Main(string[] args)
{
// UDP server port
int port = 3333;
if (args.Length > 0)
port = int.Parse(args[0]);
Console.WriteLine($"UDP server port: {port}");
Console.WriteLine();
// Create a new UDP echo server
var server = new EchoServer(IPAddress.Any, port);
// Start the server
Console.Write("Server starting...");
server.Start();
Console.WriteLine("Done!");
Console.WriteLine("Press Enter to stop the server or '!' to restart the server...");
// Perform text input
for (;;)
{
string line = Console.ReadLine();
if (string.IsNullOrEmpty(line))
break;
// Restart the server
if (line == "!")
{
Console.Write("Server restarting...");
server.Restart();
Console.WriteLine("Done!");
}
}
// Stop the server
Console.Write("Server stopping...");
server.Stop();
Console.WriteLine("Done!");
}
}
}