ssh login to LibreELEC then
echo "echo none > /sys/class/leds/blue:heartbeat/trigger" >> /storage/.config/autostart.sh
kszaq might want to put that permanently into platform_init
Thank you so much wrxtasy.
Was really racking my head on that one was adding @reboot in a crontab and that did nothing. Didn't even think of something called autostart.sh