code: def unframe(packet):
      
  
      if is_framed(packet):
          return packet.lstrip(CHR_DLE).rstrip(CHR_ETX).rstrip(CHR_DLE)
      else:
          raise ValueError('packet does not contain leading DLE and trailing DLE/ETX')
docs: Strip leading DLE and trailing DLE/ETX from packet.
  
      :param packet: TSIP packet with leading DLE and trailing DLE/ETX.
      :type packet: Binary string.
      :return: TSIP packet with leading DLE and trailing DLE/ETX removed.
      :raise: ``ValueError`` if `packet` does not start with DLE and end in DLE/ETX.