Bluetooth indoor location system

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System

  • Use beacons mounted on stationary objects within a room to allow user supplied devices to triangulate their rough position inside the room
  • The users may share their location via various means.
    • XMPP
      • complex
      • relies on external infrastructure eventually
      • robust against network topology traversals (NAT/Firewall)
    • Multicast
      • simple
      • not robust when traversing NATs
  • Useful for a conference hall or the like, where an area is large enough to prevent finding ones way or friends easily.

Hardware

SOCs

Front End/BT modules

  • just as expensive as SOCs

Software

Phone App

Android

iThing

Firmware

  • bit-bang BTLE library code for reference

Beacon

  • Similar use cases
    • Beacon tagging - tags beacon to allow device to find the tagged item
      • iBeacon - proprietary implementation
  • Use Proximity Sensing Profile (PXP/FMP) to let user devices know where and roughly how far they are from the beacons.