title: adding filter to bluetooth discovery
body: <p>I want to just discover peripheral devices when i start my Bluetooth Device discovery, my app must not discover/show other devices. is this any how possible?</p>
  
  <p>this is how i am searching for devices</p>
  
  <pre><code>  IntentFilter filter = new IntentFilter("android.bluetooth.devicepicker.action.DEVICE_SELECTED");
    registerReceiver(mBtPickReceiver,filter);
  
    startActivity(new Intent("android.bluetooth.devicepicker.action.LAUNCH")
   .putExtra("android.bluetooth.devicepicker.action.EXTRA_NEED_AUTH",false));
  </code></pre>