startScanning 
  open override fun startScanning(filter: Filter, cleanMode: BluetoothService.CleanMode, connectionSettings: ConnectionSettings?)
Starts scanning for Device. To receive the devices, use scannedDevices or allDevices
Parameters
connectionSettings 
the ConnectionSettings to apply to scanned Device. If null the default will be used Note that if a Device was previously scanned (and not cleaned by cleanMode) the old ConnectionSettings will still apply.