using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

class Program {

    private static Random random = new Random();

    static void Main(string[] args) {
        IPAddress ip = IPAddress.Parse("127.0.0.1");
        int port = 5000;
        TcpClient client = new TcpClient();
        client.Connect(ip, port);
        Console.WriteLine("client connected!!");

        Thread thread = new Thread(o => ReceiveData((TcpClient)o));

        thread.Start(client);

        Console.ReadKey();
        client.Client.Shutdown(SocketShutdown.Send);
        thread.Join();
        //ns.Close();
        client.Close();
        Console.WriteLine("disconnect from server!!");
        Console.ReadKey();
    }


    static void ReceiveData(TcpClient client) {
        NetworkStream ns = client.GetStream();
        byte[] receivedBytes = new byte[1024];
        int byte_count;


        while ((byte_count = ns.Read(receivedBytes, 0, receivedBytes.Length)) > 0) {
            String receivedDt = Encoding.ASCII.GetString(receivedBytes, 0, byte_count);
            Console.Write("in:" + receivedDt);

            int val = random.Next(3, 8) * 1000;
            Thread.Sleep(val);

            byte[] buffer = Encoding.ASCII.GetBytes(receivedDt);
            ns.Write(buffer, 0, buffer.Length);
            Console.Write("ot:" + val);
        }


    }
}