Program.cs

using System;
using System.Threading.Tasks;
using NetSdrClientApp;
using NetSdrClientApp.Networking;

namespace NetSdrClientApp
{
    public static class Program
    {
        public static async Task Main()
        {
            Console.WriteLine(@"Usage:
            C - connect
            D - disconnet
            F - set frequency
            S - Start/Stop IQ listener
            Q - quit");

        var tcpClient = new TcpClientWrapper("127.0.0.1", 5000);
        var udpClient = new UdpClientWrapper(60000);

        var netSdr = new NetSdrClient(tcpClient, udpClient);

        while (true)
        {
            var key = Console.ReadKey(intercept: true).Key;
            if (key == ConsoleKey.C)
            {
                await netSdr.ConnectAsync();
            }
            else if (key == ConsoleKey.D)
            {
                netSdr.Disconnect();
            }
            else if (key == ConsoleKey.F)
            {
                await netSdr.ChangeFrequencyAsync(20000000, 1);
            }
            else if (key == ConsoleKey.S)
            {
                if (netSdr.IQStarted)
                {
                    await netSdr.StopIQAsync();
                }
                else
                {
                    await netSdr.StartIQAsync();
                }
            }
            else if (key == ConsoleKey.Q)
            {
                break;
             }
            }
        }
    }
}