How can I get the blink status of a device?
The docs specify how to make it blink, but not how to get the blink status.
https://www.balena.io/docs/reference/supervisor/supervisor-api/#post-v1blink
The goal is to have the app query its device supervisor for blink status, and if blinking, play a sound on the speakers.
Hi @edorgeville unfortunately as far as I know that is not possible today. We have discussed building a generic “indentify” webhook like API on the supervisor for this kind of usecase where a process in the user container would be able to trigger any custom script to identify the device. Let me see if I can find a github issue to track this, it would be a great piece of functionality.
I couldn’t find a public issue for this feature, but I created one here: https://github.com/balena-io/balena-supervisor/issues/1150
I think the only way you can do this currently would be to run a privileged container and monitor the ACT led from the /sys/class/leds/led0/brightness. That file will flip between 0 and 1. You would also I think need to disable all other activity on the LED so it doesn’t trigger randomly due to mmc activity. I think you can disable the ACT led activity using:
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
That’s great, thanks!
No problemo! let us know how the work around works out!