code: public static String dumpString(byte[] frame, int offset, int length) {
      return dumpString(frame, offset, length, false);
    }
docs: Create a formatted "dump" of a sequence of bytes
  
  @param  frame    the byte array containing the bytes to be formatted
  @param  offset   the offset of the first byte to format
  @param  length   the number of bytes to format
  @return a String containing the formatted dump.