title: Bluetooth LE RSSI for proximity detection iOS
body: <p>I'll start with the question. </p>
  
  <p>Is the BTLE RSSI a good way to indicate two devices proximity to each other or not? does it only work with small devices like fobs etc?</p>
  
  <p><strong>The Issue:</strong></p>
  
  <p>I am currently looking at making an app that will use BTLE and allow connections based on proximity. In this regard it is much like the demo app that apple show in the Advanced Core Bluetooth keynote (When two devices are almost touching they then connect).</p>
  
  <p>As I understand it the proximity is determined based on the RSSI value when the central discovers the peripheral. When I try this however with two iPads the signal seems too strong for this it is also too inconsistent to have an accurate stab at the proximity as it doesn't show very much correlation to the devices proximity.</p>
  
  <p>I have tried the Apple sample code and that is similar in that the devices don't have to be close at all for the information to pass from one to another.</p>
  
  <p>If only there was a way to reduce the signal strength of the peripheral devices advertisement....</p>
  
  <p>Thanks in advance for any help.</p>