Briar always seems awesome, but wouldn't this only work if there's people with the app installed / nodes every few meters because bluetooth's range is relatively small?
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If nobody is moving around, you're right (actually the range might be greater since wifi can be used too).
If people move around, they relay the messages along their route, thus considerably extending the range.
Ah, didn't think of legs. Classic mistake
We're in 2021, we have wheels