Lightstreamer .NET metadata adapter for authentication

TestMetadataAdapter.cs

internal class TestProvider : LiteralBasedProvider
{
    public override void NotifyUser(string user, string password)
    {
        Console.WriteLine($"NotifyUser {user} {password}");
        if (false)
            throw new AccessException("Unauthorized user");
    }
}

internal class Program
{
    static void Main(string[] args) { MainAsync().Wait(); }

    static async Task MainAsync()
    {
        var host = "localhost";
        var requestReplyPort = 6660;

        var requestReply = new TcpClient();

        var connectRequestReply = requestReply.ConnectAsync(host, requestReplyPort);

        await connectRequestReply;

        var requestReplyStream = requestReply.GetStream();
        var dataProviderServer = new MetadataProviderServer
        {
            RequestStream = requestReplyStream,
            ReplyStream = requestReplyStream,
            Adapter = new TestProvider()
        };

        dataProviderServer.Start();

        Console.WriteLine("Started...");
        Console.ReadLine();
    }
}

Related browser client (HTML/JS): https://github.com/Lightstreamer/Lightstreamer-example-AuthMetadata-client-javascript/blob/master/src/index.js