var eventChannel = new EventChannel("test_event_channel");
            eventChannel.SetStreamHandler(new EventStreamHandler(
                (args, sink) =>
                {
                    Console.WriteLine("OnListen!!");
                    counter = 0;
                    timer = new Timer(100);
                    timer.Elapsed += (sender, e) =>
                    {
                        sink.Success("TEST_EVENT " + counter++);
                    };
                    timer.Start();
                },
                (args) =>
                {
                    Console.WriteLine("OnCancel!!");
                    timer.Stop();
                }));