React-native-ble-plx: Does device scan work when phone is locked?

[qiray]

Hello!

I use react-native-ble-plx to scan devices and it works well while the phone isn't locked. When I lock the phone the scan stops. After device is unlocked scan works again.

So is it possible to scan BLE devices while the phone is locked?

I use LowLatency mode for scanning and phone with Android 10.

{ scanMode: ScanMode.LowLatency }

[dariuszseweryn]

It is but your app needs to have proper permission granted by the user (to use always) and you need to use scan filters.

[qiray]

@dariuszseweryn, I added android.permission.ACCESS_BACKGROUND_LOCATION to AndroidManifest.xml and enabled "Allow all the time" in settings but it seems to have no effect. What filters and permissions should I add to make it work?

[dariuszseweryn]

Filters adequate for the advertisement of the peripheral you are interested it. You cannot "scan everything" in the background because it may be used to locate the user.

[qiray]

So I need to add UUIDs list for correct background scan, right?

[dariuszseweryn]

Right