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@grahamguy And these would only need to ping maybe a few times a day. Maybe increasing rate if there’s more motion detected.

@grahamguy The math is beyond me. Conceptually I know it sounds like it should be possible, but I know little more than the concepts.

@grahamguy A cheap solar-light style PV panel would probably be enough to keep a BT radio running for a long time. Garden light chassis.

@grahamguy That’d be the sort of thing I had in mind. Something that could be dropped like lawn-darts from a distance. Cheap & hands-off.

They also require line of sight from a single centre point.