private static IObservable <uint> Frames(Auto.ISource autoSource, Mqtt.ISource mqttSource)
{
IObservable <uint> autoFrames = autoSource.Create().Publish().RefCount();
IObservable <uint> mqttFrames = mqttSource.Create().Publish().RefCount();
IConnectableObservable <uint> mqttFramesWithReplay = mqttFrames.Replay(1);
var mqttFrameTimeout = mqttFrames
.Timeout(TimeSpan.FromSeconds(10))
.IgnoreElements()
.Materialize()
.Where(notification => notification.Kind == NotificationKind.OnError);
var autoFramesUntilMqttFrames = autoFrames.TakeUntil(mqttFrames);
var mqttFramesUntilTimeout = mqttFramesWithReplay.TakeUntil(mqttFrameTimeout);
return(Observable.Using(
() => mqttFramesWithReplay.Connect(),
_ => Observable.Defer(() => Observable.Concat(autoFramesUntilMqttFrames, mqttFramesUntilTimeout)).Repeat()
));
}