def _add_request_entry(self, entry=()):
        """This function record the request with netfn, sequence number and
        command, which will be used in parse_ipmi_payload.
        :param entry: a set of netfn, sequence number and command.
        """
        if not self._lookup_request_entry(entry):
            self.request_entry.append(entry)
This function record the request with netfn, sequence number and
        command, which will be used in parse_ipmi_payload.
        :param entry: a set of netfn, sequence number and command.