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By QuickFix
#77146 I'm afraid it's a bit of a contradiction (in software): a SW-watchdog is active while the code is running and when deep sleep is active, no code is running. :?

You could, of course, create an external watchdog in hardware that trips when the ESP isn't woken from deep sleep. :idea:
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By btidey
#77150 Both hardware and software watchdogs are there to catch running application freezes or timeouts.

In sleep nothing is running except for the timer that will trigger a wake. So the internal watchdogs are not relevant.