Dfyjkt

When I initialize BLE scanning, I am able to successfully see all devices when I use the following code (in foreground, with Nokia 1 running Android 8.1.0):

ScanSettings settings = (new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_LOW_POWER)).build();

List<ScanFilter> filters = new ArrayList<>();
ScanFilter filter = new ScanFilter.Builder().build();
filters.add(filter);

BluetoothManager bluetoothManager =
 (BluetoothManager) getApplicationContext().getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
Intent intent = new Intent(getApplicationContext(), PendingIntentScanReceiver.class);
intent.putExtra("o-scan", true);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),
 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
bluetoothAdapter.getBluetoothLeScanner().startScan(filters, settings, pendingIntent);

But as soon as I modify the list of filters (lines 2 - 4 in example) like this:

ScanFilter filter = new ScanFilter.Builder()
 .setDeviceAddress("54:6C:0E:20:E6:1B")

 // or instead of setDeviceAddress trying this:
 .setServiceUuid(ParcelUuid.fromString("0000a1b0-0000-1000-8000-00805f9b34fb"))
 .build();
filters.add(filter);

I am no longer able to see anything. Any thoughts on what might be going on here?