using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Zeus.Thunder.Core;
using System.Net; // For IPEndPoint
using System.Net.Sockets; // For UdpClient, SocketException

namespace SharpTrainer.NetWork
{
    class UdpEchoClient : ITestCase
    {
        public void Run()
        {
            Console.Write("Input Server IP: ");
            string server = Console.ReadLine();

            Console.Write("Input Server Port: ");
            int servPort = Int32.Parse(Console.ReadLine());

            Console.Write("Input Echo String: ");
            byte[] sendPacket = Encoding.ASCII.GetBytes(Console.ReadLine());

            // Create a UdpClient instance
            UdpClient client = new UdpClient();
            try 
            {
                // Send the echo string to the specified host and port
                client.Send(sendPacket, sendPacket.Length, server, servPort);
                Console.WriteLine("Sent {0} bytes to the server...", sendPacket.Length);

                // This IPEndPoint instance will be populated with the remote sender’s
                // endpoint information after the Receive() call
                IPEndPoint remoteIPEndPoint = new IPEndPoint(IPAddress.Any, 0);

                // Attempt echo reply receive
                byte[] rcvPacket = client.Receive(ref remoteIPEndPoint);

                Console.WriteLine("Received {0} bytes from {1}: {2}", rcvPacket.Length, remoteIPEndPoint,
                    Encoding.ASCII.GetString(rcvPacket, 0, rcvPacket.Length));
            } 
            catch (SocketException se) 
            {
                Console.WriteLine(se.ErrorCode + ": " + se.Message);
            }

            client.Close();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Zeus.Thunder.Core;
using System.Net; // For IPEndPoint
using System.Net.Sockets; // For UdpClient, SocketException

namespace SharpTrainer.NetWork
{
    class UdpEchoServer : ITestCase
    {
        public void Run()
        {
            Console.Write("Input Server Port: ");
            int servPort = Int32.Parse(Console.ReadLine());

            UdpClient client = null;
             try {
                // Create an instance of UdpClient on the port to listen on
                client = new UdpClient(servPort);
            } catch (SocketException se) {
                Console.WriteLine(se.ErrorCode + ": " + se.Message);
                Environment.Exit(se.ErrorCode);
            }

            // Create an IPEndPoint instance that will be passed as a reference
            // to the Receive() call and be populated with the remote client info
            IPEndPoint remoteIPEndPoint = new IPEndPoint(IPAddress.Any, 0);

            for (;;) 
            { 
                // Run forever, receiving and echoing datagrams
                try {
                    // Receive a byte array with echo datagram packet contents
                    byte[] byteBuffer = client.Receive(ref remoteIPEndPoint);
                    Console.Write("Handling client at " + remoteIPEndPoint + " - ");
                    // Send an echo packet back to the client
                    client.Send(byteBuffer, byteBuffer.Length, remoteIPEndPoint);
                    Console.WriteLine("echoed {0} bytes.", byteBuffer.Length);
                } catch (SocketException se) {
                    Console.WriteLine(se.ErrorCode + ": " + se.Message);
                }
            }
        }
    }
}