Launch the service BackgroundUsbService. If started without a connected reader, the service remains alive and looks for a reader. If there is no USB permission granted already, the app will ask for such a permission whenever a reader is connected.
For some Android devices the reader permission is not saved via the request usb permission operation in the service. To stop the 'permission box' from reappearing, add an activity which triggers on the right filter
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/accessory_filter" />
with accessory_filter
<resources>
<usb-device vendor-id="1839" />
</resources>
where 1839 is ACS.
Launch the service BluetoothBackgroundService.
The service has some configuration options, loaded from shared preferences. These are listed in the top of the service class.
There is a basic implementation of bluetooth reader support
Note on bluetooth: See the docs folder for info how to reset the devices. The tool can also be using via a Windows virtual machine.