gistfile1.cs

public IObservable<bool> IsConnected
{
    get
    {
        return _connectionSubject.Select(isConnected => {
            if (isConnected) 
                return Telemetry.Buffer(TimeSpan.FromSeconds(2)).Select(l => l.Count > 0);
            return Observable.Return(false);
        }).Switch();
    }
}