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    copied!<p>Well, the first thing is that even if your kiosk has a Class 1 Bluetooth radio in it, which can actually go farther than the advertised 100 meters, it's still extremely unlikely that there will be millions of Bluetooth cell phones who have previously paired with your kiosk within the range of your kiosk's radio. So that narrows down the potential number of Bluetooth devices you're dealing with.</p> <p>Second, if a device is not discoverable, then it doesn't matter if you've paired with it before or not. You will not find it using a general "Hello, is anybody out there?" inquiry scan. If you've paired with a device, you will know its Bluetooth Device Address and can therefore ping it explicitly and get an answer. This doesn't seem like a reasonable thing to do if you're thinking you might have millions of cell phones paired with your kiosk. (Have you thought about the fact that if you have multiple kiosks your users would have to pair with each kiosk separately? Do you really need to pair with the cell phones to do what you need to do?)</p> <p>Having said all that, a general inquiry scan will produce a list of discoverable Bluetooth devices in the vicinity of your kiosk's radio. You could use that list to search your own list of devices paired with the kiosk. I can't remember if you get back just the friendly name in the first response or if you get a BD_ADDR as well. If you just get the friendly name, there could be multiple devices with the same friendly name, as I doubt many users change their phones' friendly names.</p> <p>It's been a while since I really delved into the Bluetooth spec so things may have changed. </p>
 

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