public StunServer(int refreshInterval, SynchronizationContext ctx)
{
_synchronization = ctx;
_refreshMs = refreshInterval;
var blackHole = new UndefinedResolver();
userResolver = new UsersOnline();
authresolver = new Authentification();
var routes = authresolver.Compose(userResolver, blackHole);
observer = new UDPObserver(_serverPort, ctx, routes);
_client = new UdpClient(AddressFamily.InterNetwork);
}