Try this http://stackoverflow.com/questions/3624945/how-to-measure-distance-between-two-iphone-devices-using-bluetooth

On Oct 28, 2015 4:37 PM, "Mbugua Njihia via skunkworks" <skunkworks@lists.my.co.ke> wrote:
Good people, does anyone here have experience with the calculation of distance between two nodes connected intermittently via Bluetooth?  In my use-case the nodes are in constant motion withing the same area.

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