/// SERVER
namespace TcpServer
{
    using System;
    using System.Net;
    using System.Net.Sockets;
    using System.Text;
    using System.Threading;

    class Program
    {
        public static void Main(string[] args)
        {
            var server = new TcpListener(IPAddress.Parse("127.0.0.1"), 6112);
            server.Start();

            Console.WriteLine("Server has started on 127.0.0.1:6112.");
            Console.WriteLine("Waiting for a connection...");

            Thread.Sleep(3000);
            var client = server.AcceptTcpClient();
            Console.WriteLine("A client has connected.");

            Thread.Sleep(3000);
            var serverToClientStream = client.GetStream();
            while (!serverToClientStream.DataAvailable) { /* wait, do nothing */ };

            var buffer = new byte[1024];
            for (int i = 0; i < buffer.Length && serverToClientStream.DataAvailable; i++)
            {
               const int bytesToReadCount = 1;
               serverToClientStream.Read(buffer, i, bytesToReadCount);
            }

            var message = Encoding.UTF8.GetString(buffer);
            Console.WriteLine($"Received message from client: {message}");

            Console.WriteLine("Press any key to continue...");
            Console.ReadLine();
        }
    }
}


/// CLIENT
namespace TcpClient
{
    using System;
    using System.Net.Sockets;
    using System.Text;
    using System.Threading;

    class Program
    {
        static void Main(string[] args)
        {
            Thread.Sleep(3000);
            using (var client = new TcpClient("127.0.0.1", 6112))
            {
                Console.WriteLine("Connected");
                var clientToServerStream = client.GetStream();

                Thread.Sleep(3000);
                var message = "Message from client";
                byte[] messageBuffer = Encoding.UTF8.GetBytes(message);
                clientToServerStream.Write(messageBuffer, 0, messageBuffer.Length);
                Console.WriteLine($"Sent to server: {message}");
            }

            Console.WriteLine("Press any key to continue...");
            Console.ReadLine();
        }
    }
}








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