code: def send_message(self, msg):
          
          msg.type_ = aioxmpp.MessageType.GROUPCHAT
          msg.to = self._mucjid
          # see https://mail.jabber.org/pipermail/standards/2017-January/032048.html  # NOQA
          # for a full discussion on the rationale for this.
          # TL;DR: we want to help entities to discover that a message is related
          # to a MUC.
          msg.xep0045_muc_user = muc_xso.UserExt()
          result = self.service.client.enqueue(msg)
          return result
docs: Send a message to the MUC.
  
          :param msg: The message to send.
          :type msg: :class:`aioxmpp.Message`
          :return: The stanza token of the message.
          :rtype: :class:`~aioxmpp.stream.StanzaToken`
  
          There is no need to set the address attributes or the type of the
          message correctly; those will be overridden by this method to conform
          to the requirements of a message to the MUC. Other attributes are left
          untouched (except that :meth:`~.StanzaBase.autoset_id` is called) and
          can be used as desired for the message.
  
          .. seealso::
  
              :meth:`.AbstractConversation.send_message` for the full interface
              specification.