sharkfin v0.1.6

Alpha. Back up from the Device tab before you rely on it.

Plug the keyboard in with a USB cable. There is no config
interface over 2.4 GHz or Bluetooth.

Linux also needs a udev rule so the app can reach the
keyboard:

# /etc/udev/rules.d/70-sharkfin.rules
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="3151", MODE="0660", TAG+="uaccess"

Then sudo udevadm control --reload-rules && sudo udevadm trigger,
and replug the keyboard.

Not sure if your board is supported? See
docs/BOARDS.md.