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Nothing on ARM (and with linux) probably that can run off a button cell. Down to arduino etc microcontroller level.

Need to go down to the microcontroller level, Pi Pico, or Arduino

I am not aware of a linux board that can do this. It'd be pretty sick though, I'd love to be proven wrong.

It seems to me that a microcontroller with an RTOS might be more up this alley (perhaps the esp8266/esp32 platform, but I'm no expert).

If found them both to eat a bit much battery for much, though I was connecting to wifi.

That said, it is incredible how fast they can boot, connect to wifi, send something and shutdown again.