rak4631 (nrf52) hang, add support for hardware watchdog?

[SebKuzminsky]

Hi there, we're trying to use a rak4631 (nrf52840) in a repeater node. It's running Meshtastic 2.7.10 or thereabouts. It was running well for about two weeks, then it stopped repeating for no obvious reason (it still had plenty of power). We visited the site and power cycled it by hand, and it started repeating again. So it looks like a software crash.

I see that there is support in the esp32 platform for the on-chip watchdog, and i see that the nrf52 hardware includes a watchdog (https://docs.nordicsemi.com/bundle/ps_nrf52840/page/wdt.html), but that it's not supported by Meshtastic firmware yet.

Have you considered adding watchdog support for the nrf52 platform? Is there any technical reason this wouldn't work, or would be a bad idea?

I'd be happy to work on this feature if it seems reasonable to people.

[thebentern]

Howdy! We've talked about adding the NRF52 watchdog as well. Happy to have a contribution here.

[SebKuzminsky]

Excellent, i'll get on it! :-)
Looks like i should base the PR i'm working on on the develop branch?

[thebentern]

Absolutely. Thanks!

[fifieldt]

Welcome to the team :)

[SebKuzminsky]

Feedback requested: #8485