title: Android bluetooth setpin function
body: <p>My Android device is trying to connect to a sensor via Bluetooth.</p>
  
  <p>As a normal Bluetooth device, I will need to pragmatically set up the pin code (usually 0000 or 1234)</p>
  
  <p>for the sensor side since it is silent and would not pop up the request dialogue.</p>
  
  <p>I did not find any related clue on the Android dev site.</p>
  
  <p>Does anyone can tell me if there is any approach available to achieve this?</p>