I wasn’t sure whether to write this in this thread of the RFID sticky. But here I am.
Why not use a combination of RFID and BT or WiFi? It would be pretty hard and expensive to try and triangulate a phone, etc position with BT and let’s be hoenst, who wants horrible little stickers on the bottoms of their devices for an MT device to look for? Plus surely that would only work for a DI set up?
So, use RFID to find a device that is in range (i.e. placed on the table). RFID is fairly close proximity, so you could set up an RFID reader with it’s active RF field within a very small radius around the MT device. So for example, the field would just reach out to just above a MT coffee table surface. That shouldn’t be too hard to do with correct sensors and power levels. Just turn the gain up or down. Or hell, you could have a small “hot zone” around the table so it picks up it has a possible device it can connect to, as it could just be an ID card and not a phone or camera, etc.
Then once it knows there is a device within range it can look for a BT or WiFi enabled device. Now you would have to pair the devices the first time you use it, but let’s face it that’s not hard and there after they can just connect automatically. Then through BT or WiFi it grabs the data info (pics, audio, etc) and spits it out across the screen so you can play with it. You don’t even need to transfer anything, just get the data information and transfer the actual files only when needed. So for a transfer or to play a video or something like that.
Connection to the device is then automatically ended when it goes out of RFID range.
Advantage of using a combo is that from my understanding of RFID, the point is to identify a device (embed the RFID and BT and WiFi MAC addresses with the same address) and then carry out an action. So in theory it should be pretty straight forward. Detect > initiate connection > Pair if needed, otherwise sync together > manipulate data > disconnect when no longer in RFID range.