Android Question BLE2 Manager not works on screen off

You need to have a foreground service and a partial wake lock.

Check this: Background location tracking

Don't expect your app to run forever. It will be killed at some point.

Thanks Erel for your reply, but I have already inserted what you suggest.
The problems are mainly two:
1) the manager.scan2() doesn't work if in the first parameter I put a uuid (among other things which uuid should I put if I have to scan beacons?)
2) if I press the power button once to turn off the screen, the scan stops

I read in the documentation that to continue scanning with the display off it is necessary, from version 8+, to run a filter, but what can I do if the filter doesn't work?

Thanks for your patience

The filter should work if the service uuid is advertised by the peripheral.

Thank you so much Erel, how can I make sure of this?
I tried to scan with the BLExample app and these are the exposed uuids:

00001801-0000-1000-8000-00805f9b34fb
00001800-0000-1000-8000-00805f9b34fb
0000180a-0000-1000-8000-00805f9b34fb
0000180f-0000-1000-8000-00805f9b34fb
a3c87500-8ed3-4bdf-8a39-a01bebede295
a3c88800-8ed3-4bdf-8a39-a01bebede295

but with none of these the command manager.scan2(uuid_list, true) seems to work.

It seems to never raise the "_deviceFound" callback.

Thanks for the help you want to give me

Maybe the device doesn't advertise these services.

I also contacted the manufacturer who confirmed that those are the published UUIDs, but unfortunately the filter doesn't work. I do not know what to do.