Shutdown process / status display.

[BeerGeek]

I want to display the "Off" status on Axon. When we switch OS to shutdown mode (shutdown -h now), I want to turn on the green LED when the user can switch power off. So I will avoid violating the flash card and the os file system.

Can't find a solution, maybe there are some standard solutions?

[Martin Kudláček]

Hi @beergeek,
there is probably a number of ways how to do it. This could be one of them:

• create /usr/local/sbin/shutdown and add the exec bit to it
• in the script, specify the logic - get the IOs into safe state and/or light up the user LEDs
• at the end of the script, call shutdown -h now

The logic can use the SysFS approach such as this:

echo 1 > /run/unipi/io_group1/do_1_01/do_value # sets DO1.1 to true

Although you don't have the user LEDs available in the SysFS right now. For that, you can use mbpoll and set it via ModbusTCP.

Best regards,
Martin