yes this may not be very well known that's why I posted it. Hopefully more apps implement it as an option at least. Although it is difficult since most people just use the apple or google services. Installing an additional service like this to use it only in one application would not make much sense. But for those who don't have google services installed, this can enable notifications in a good way without consuming much battery. anyway I thought it was interesting to share. I'll see if I can make it work for one app I'm doing. :)