How to use the pyulog.core.ULog._MessageFlagBits function in pyulog

msg_format = self.MessageFormat(data, header)
                    self._message_formats[msg_format.name] = msg_format
                elif header.msg_type == self.MSG_TYPE_PARAMETER:
                    msg_info = self._MessageInfo(data, header)
                    self._initial_parameters[msg_info.key] = msg_info.value
                elif (header.msg_type == self.MSG_TYPE_ADD_LOGGED_MSG or
                      header.msg_type == self.MSG_TYPE_LOGGING or
                      header.msg_type == self.MSG_TYPE_LOGGING_TAGGED):
                    self._file_handle.seek(-(3+header.msg_size), 1)
                    break # end of section
                elif header.msg_type == self.MSG_TYPE_FLAG_BITS:
                    # make sure this is the first message in the log
                    if self._file_handle.tell() != 16 + 3 + header.msg_size:
                        print('Error: FLAGS_BITS message must be first message. Offset:',
                              self._file_handle.tell())
                    msg_flag_bits = self._MessageFlagBits(data, header)
                    self._compat_flags = msg_flag_bits.compat_flags
                    self._incompat_flags = msg_flag_bits.incompat_flags
                    self._appended_offsets = msg_flag_bits.appended_offsets
                    if self._debug:
                        print('compat flags:  ', self._compat_flags)
                        print('incompat flags:', self._incompat_flags)
                        print('appended offsets:', self._appended_offsets)

                    # check if there are bits set that we don't know
                    unknown_incompat_flag_msg = \
                    "Unknown incompatible flag set: cannot parse the log"
                    if self._incompat_flags[0] & ~1:
                        raise Exception(unknown_incompat_flag_msg)
                    for i in range(1, 8):
                        if self._incompat_flags[i]:
                            raise Exception(unknown_incompat_flag_msg)