How to setup hardware monitoring?

[TFL]

I installed FreeNAS on a WD PR4100 NAS. It runs from a USB flash drive.
The box has a fan, 2 line LCD and several temperature sensors that can be controlled via UART over /dev/ttyu3 (as of FreeNAS 11.2).
I ported this control script to BSD and got it running in a jail with devfs_ruleset 0. It requires python2, py27-serial and pip.
The script tries to shutdown the NAS when it overheats... but this can't be done from a jail...

Where is the best place to install / setup these hardware monitoring scripts?
Does it make sense to put all this in a jail?
Should I use the startup/shutdown tasks?

 

[Chris Moore]

Because of the very custom nature of this, you may need to make a custom build of FreeNAS from the source code and integrate these changes.

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[TFL]

I could maybe simplify it and use something like https://forums.freenas.org/index.php?resources/fan-scripts-for-supermicro-boards-using-pid-logic.24/ .. but where to put these scripts?
I've done custom FreeNAS isos but I'd rather stick to official images.

EDIT: here's a more complete fan control setup: https://forums.freenas.org/index.php?threads/script-hybrid-cpu-hd-fan-zone-controller.46159/
OK I've got what I need.