code: def nl_finish_handler_debug(msg, arg):
      
      ofd = arg or _LOGGER.debug
      ofd('-- Debug: End of multipart message block: ' + print_header_content(nlmsg_hdr(msg)))
      return NL_STOP
docs: https://github.com/thom311/libnl/blob/libnl3_2_25/lib/handlers.c#L103.