title: Android, How can I make BLE device to paired device (bonded)
body: <p>Before GATT,
  createRfcommSocketToServiceRecord,
  createInsecureRfcommSocketToServiceRecord</p>
  
  <p>methods can make paired device,</p>
  
  <p>but GATT has no option about paired device,
  only use BluetoothDevice.connectGatt(...)</p>
  
  <p>I want to make a paired device if it's connected already.</p>
  
  <p>thx.</p>