code: public String getBeaconIdAsString()
      {
          if (mBeaconIdAsString == null)
          {
              mBeaconIdAsString = Bytes.toHexString(getBeaconId(), true);
          }
  
          return mBeaconIdAsString;
      }
docs: Get the 16-byte beacon ID as an upper-case hex string.
  
  @return
  The beacon ID.