Since android 8.1.0, android doesn't allow scanning without filters when the phone is locked. A work around for this is adding an empty filter. More info in this stackoverflow: https://stackoverflow.com/questions/48077690/ble-scan-is-not-working-when-screen-is-off-on-android-8-1-0

Is it possible to add an option for adding an empty filter? Or change the standard empty services array [] to use an empty filter instead of no filter.