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Feeder Robot (from makers of Litter Robot) has a simple offline manual mode using just buttons; i believe if you use the app and program a custom schedule it gets retained but the manual mode should be enough unless there are special dietary concerns
Unless I'm missing something, seems kind of short-sighted to not keep a local copy of the schedule just for this very situation?

In fact, why would you even design it like this to begin with? It's not like a pet feeding schedule is dynamic data that changes every day. Makes no sense.

when I was poking at the protocol (MQTT plaintext, including the auth) given the esp32 doesn't have a RTC onboard, they would send MQTT packets with the current time and I suspect that they trigger off of those time packets rather then the software time source on the esp32.
Interesting! Hadn't even considered that.
I actually refreshed my petlibro feeders and water fountains with a replacement esphome firmware https://github.com/taylorfinnell/petlibro-esphome

Works great and completely local.