Raspberry specific steps

For controlling the backlight from the app

echo 'SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"' | sudo tee -a /etc/udev/rules.d/backlight-permissions.rules

Start the app on start

file: /home/pi/.config/lxsession/LXDE-pi/autostart

content:

@xset s off
@xset -dpms
@xset s noblank
@chromium-browser --kiosk --app=http://localhost:9000/