/**
  * Returns the hardware address of the local Bluetooth adapter.
  *
  * <p>For example, "00:11:22:AA:BB:CC".
  *
  * <p>Requires {@link android.Manifest.permission#BLUETOOTH}
  *
  * @return Bluetooth hardware address as string
  */
 public String getAddress() {
   try {
     return mService.getAddress();
   } catch (RemoteException e) {
     Log.e(TAG, "", e);
   }
   return null;
 }