As we're facing some challenges within the Barcode/RFID/NFC Reader support, as
most of the readers don't support anything but HID, which leads to
- trouble with different keyboard layouts (fr)
- global state of caps-lock and/or held shift on 'the other keyboard'
- focus issues in the GUI
- values being exposed to eavesdropping by users
- values bring entered by users after the latter
This class intends to solve all this in Linux (so far), by using direct access
to /dev/input/by-id device nodes and parsing the kernel input messages, locking
the device node exclusively thus shielding away any parallel access to it by
the OS.
The keyboard layout is fixed to US/ASCII, which is the factory setting of most
of these devices anyway.
The class provides an event listener api with an asynchronous callback, so your
listener can work directly within the callback thread.