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I'm not familiar with app engineering, but wouldn't the location access be enough for that?

It's not app engineering, it's a comparison of GPS accuracy (especially indoors) vs a bluetooth beacon. Beacons work great no matter where you go.

I'm currently on the 11th floor of a building. GPS accuracy in the vertical dimension is much worse than horizontal. A bluetooth beacon will tell you if I'm in the same room with someone else.

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