Request: Support a call to user function when Watchdog Timer expires

[IraSch]

I'm using SleepyDog with a SAMD processor. I changed over from WDTZero to SleepyDog to avoid an issue where WDTZero causes problems with the RTC.

In the SleepyDog code (WatchDogSAMD.cpp starting at line 80), I noted a section of comments that references making a call to interrupt function prior to the actual timer expiring. WDTZero has this capability. Is this available in SleepyDog and if not can it be added?

Thank you.

[tyeth]

There is a plan to support such behaviour, as we are now looking at low power mode in Adafruit WipperSnapper.
Tagging @brentru for visibility of related work