[azdle]

I know what you mean about the tracking and that's actually part of the reason I think this method makes more sense. Something that's been in my head, but not put down anywhere is the idea of applications registering domains. Which to my understanding is similar to how other beaconing works, where UUIDs are registered.

Although there is only so much that you can do to prevent it. I'm kinda mulling around the thought of one basic (anonymous, except IP) request to the base domain for general information about the endpoint and if these implement some sort if well-known action types (transit-stop, point-of-interest, ???) then you'd be able to allow requests to always be made on a domain-by-domain basis or maybe some sort of "tap-for-info" button when you're near something interesting. Not sure yet, but I am generally trying to keep privacy in mind.

EDIT: Missed the part about the advertising packets. I don't really know, I've only read through the BT4 spec really quickly, but I have to imagine it has to do with both not congesting the spectrum with overly verbose broadcast messages and limiting power usage.