How to programmatically select the BT device to push a file to?

Question

Hi,

I am designing an information kiosk and need a BT application which can automatically push a file to the nearest BT enabled device assuming that this would be the phone of the person currently standing in front of the kiosk.

Is there any other ways of doing this except by checking the RSSI (Received Singal Strength Indicator)?

Do all Bluetooth stacks support accessing this property?

How accurate is RSSI as the basis for the decision to which device to push to? Can it be that other phones which are further away from the kiosk can emit a stronger signal than the signal coming from the phone of the guy standing right in front of the kiosk?

Answer 1

Not all stacks support RSSI.

There's an alternate way: the device who first answers to Inquiries should have a stronger signal.

Your guess is true, it only depends on signal strength, not distance.

Also, the device with the stronger signal is not necessarily the one which answers first, since implementations of the protocol are different among devices. Thus you would have to test all target devices separately.