Sounds like a bit of dodgy design then. I mean I suppose you would need some
kind of receiver for its frequency, but all you would be able to deduce as
that it was doing something. Cannot the web site use diagnostics to tell you
if its being received?
Brian

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Can you attach a latching circuit to the LED to provide a hold on for
about 10 mins?

No, the battery would not have the capacity to support it.


The hold-on circuit and its LED could be separately powered and connected
to the gadget electrically or optically, over a twin cable to a
visible/accessible place.

The gadget is inside a sealed container. It is actually an electronic
hydrometer for my homebrew.


That woudln't confirm transmittal of data, but would at least confirm
wake-ups.