code: static String hexStrToStr(String s) {
          StringBuilder ret = new StringBuilder();
          for (int i = 0; i < s.length(); i += 2) {
              ret.append((char) Integer.parseInt(s.substring(i, i + 2), 16));
          }
          return ret.toString();
      }
docs: converts hex value string to normal strint for use with RouterOS API
  
  @param s - hex string to convert to
  @return - converted string.