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We can control the blue LEDTurquoise Highlighted Text with trigger node.

Turn off

su -
echo none > /sys/class/leds/blue\:heartbeat/trigger

Turn on

su -
echo deafult-on > /sys/class/leds/blue\:heartbeat/trigger

Hearbeat (original state)

su -
echo heartbeat > /sys/class/leds/blue\:heartbeat/trigger

There are many more triggers. But some of them may not work.

cat /sys/class/leds/blue\:heartbeat/trigger