Resolve exit fullscreen on Ras pi

1. Check current desktop

echo $XDG_SESSION_TYPE
wayland << it is

2. Change desktop to X11
 sudo raspi-config
 choose Advanced Options > Wayland > X11

 reboot

3. Recheck the desktop, it should be x11

echo $XDG_SESSION_TYPE
x11


4. Install wmctrl

apt update
apt install wmctrl

5. Create shell script name set_chromium_fs.sh with below script


#!/bin/bash

sec=$1

while :; do
	wmctrl -r "Chromium" -b add,fullscreen
	sleep $sec
done

6. Permit execution mode to above file

chmod +x set_chromium_fs.sh



7. Call this script at startup boot

For example : try set full screen of chromium every 30 second

/home/pi/set_chromium_fs.sh 30 &