code: public String getEIDAsString()
      {
          if (mEIDAsString == null)
          {
              mEIDAsString = Bytes.toHexString(getEID(), true);
          }
  
          return mEIDAsString;
      }
docs: Get the 8-byte EID (ephemeral identifier) as an upper-case hex string.
  
  @return
  The EID (ephemeral identifier).