In order to properly implement either push messaging or frequent polling themselves, an app needs to run a foreground service. This is displayed as a persistent notification. It will normally be marked as a silent notification - with the lowest possible priority, so it will be collapsed as the bottom and + with the lowest possible priority, so it will be collapsed at the bottom and won't show up as an icon in the status bar or on the lockscreen. A battery optimization exception is also needed for the app to bypass device idle states and run while the device is idle. If you can tolerate delays while the device