Is it possible to use BLE to tap two iPhones together and initiate a file transfer?

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Similar to how S-Beam works on Galaxy phones, could I tap two iOS7 devices together and use the RSSI to initiate a file transfer. I would like to share a photo by touching another iPhone.

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Well,

  • It's possible to use BLE to communicate between two phones
  • It's possible to use Core Motion to detect a "bump"

So, yes. Writing the code to do all of this is your job. Note that BLE has pretty low transfer rates. You might want to look at multi-peer networking to do device-to-device Wifi.