Android 5.x BluetoothLeScanner returns -99

[Freddy Sørensen]

In Android 5.x (API 21) and up, we are experiencing a problem with our BluetoothLeScanner, on some Samsung models like S4 Mini and S5 Mini. More precisely, an error is being caught in the onScanFailed(int errorcode) of our ScanCallback, with a value of -99. This value is not mentioned in the class documentation, and we were wondering, if any of you have any idea what this could be, and how we could fix it?

Kind regards Freddy

[Sigurd]

You could try another scan settings, there are some properties that can be set, e.g. a delay, a filter etc. Also, we recommend using the Android Compat Scanner Library.

If filtering or batching is not working, there are also methods like this, that can emulate the native behavior in code (parse manually etc). But, usually changing the settings will help, or restarting the device.