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Old Pages/Old Wiki/Bluetooth_indoor_location_system.md

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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.
+
+testing guest captcha
+
+## Hardware
+
+### SOCs
+
+- [Nordic](http://www.mouser.com/ProductDetail/Nordic-Semiconductor/nRF51822-QFAB-R7/?qs=sGAEpiMZZMvQqVCO1QUke9rOCiF3q8UDR59ukwBL9d8%3d)
+- [TI](http://www.mouser.com/ProductDetail/Texas-Instruments/CC2540F128RHAR/?qs=sGAEpiMZZMuReUCzg6bfTFMX9eNsg5flb%2fyNLpDtSPE%3d)
+
+### Front End/BT modules
+
+- just as expensive as SOCs
+
+## Software
+
+### Phone App
+
+#### Android
+
+#### iThing
+
+### Firmware
+
+- bit-bang BTLE library
+  [code](https://dmitry.gr/index.php?r=05.Projects&proj=11.%20Bluetooth%20LE%20fakery)
+  for reference
+
+#### Beacon
+
+- Similar use cases
+  - Beacon tagging - tags beacon to allow device to find the tagged item
+    - [iBeacon](http://en.wikipedia.org/wiki/IBeacon) - proprietary
+      implementation
+- Use [Proximity
+  Sensing](http://en.wikipedia.org/wiki/Bluetooth_low_energy#Proximity_sensing)
+  Profile (PXP/FMP) to let user devices know where and roughly how far
+  they are from the beacons.