Doze mode and App Standby may temporarily suspend background execution for your app when it goes to background.
To send notifications to Android devices in power saving mode, we recommend implementing FCM high priority fallback delivery. Pushy will attempt to deliver your notifications through MQTT and Firebase Cloud Messaging simultaneously, to burst through Android power saving mode.
Otherwise, you can ask your users to disable battery optimization for your app by displaying an in-app dialog with instructions and firing the
Alternatively, ask your users to long tap your app -> App Info -> Battery -> Battery Optimization -> All Apps -> Find & tap your app -> Select "Don't optimize".
Both of these solutions will make it possible for your users to receive notifications even in power saving mode.