Parse the next packet.

        :param ptype: The (string) type of the incoming packet
        :param `.Message` m: The paket content

def parse_next(self, ptype, m):
        """
        Parse the next packet.

        :param ptype: The (string) type of the incoming packet
        :param `.Message` m: The paket content
        """
        if ptype == MSG_KEXGSS_GROUPREQ:
            return self._parse_kexgss_groupreq(m)
        elif ptype == MSG_KEXGSS_GROUP:
            return self._parse_kexgss_group(m)
        elif ptype == MSG_KEXGSS_INIT:
            return self._parse_kexgss_gex_init(m)
        elif ptype == MSG_KEXGSS_HOSTKEY:
            return self._parse_kexgss_hostkey(m)
        elif ptype == MSG_KEXGSS_CONTINUE:
            return self._parse_kexgss_continue(m)
        elif ptype == MSG_KEXGSS_COMPLETE:
            return self._parse_kexgss_complete(m)
        elif ptype == MSG_KEXGSS_ERROR:
            return self._parse_kexgss_error(m)
        msg = "KexGex asked to handle packet type {:d}"
        raise SSHException(msg.format(ptype))