Send a message to one or more connected clients.

        This function emits an event with the name ``'message'``. Use
        :func:`emit` to issue custom event names.

        :param data: The data to send to the client or clients. Data can be of
                     type ``str``, ``bytes``, ``list`` or ``dict``. If a
                     ``list`` or ``dict``, the data will be serialized as JSON.
        :param room: The recipient of the message. This can be set to the
                     session ID of a client to address that client's room, or
                     to any custom room created by the application, If this
                     argument is omitted the event is broadcasted to all
                     connected clients.
        :param skip_sid: The session ID of a client to skip when broadcasting
                         to a room or to all clients. This can be used to
                         prevent a message from being sent to the sender.
        :param namespace: The Socket.IO namespace for the event. If this
                          argument is omitted the event is emitted to the
                          default namespace.
        :param callback: If given, this function will be called to acknowledge
                         the the client has received the message. The arguments
                         that will be passed to the function are those provided
                         by the client. Callback functions can only be used
                         when addressing an individual client.
        :param ignore_queue: Only used when a message queue is configured. If
                             set to ``True``, the event is emitted to the
                             clients directly, without going through the queue.
                             This is more efficient, but only works when a
                             single server process is used. It is recommended
                             to always leave this parameter with its default
                             value of ``False``.

        Note: this method is a coroutine.

async def send(self, data, room=None, skip_sid=None, namespace=None,
                   callback=None, **kwargs):
        """Send a message to one or more connected clients.

        This function emits an event with the name ``'message'``. Use
        :func:`emit` to issue custom event names.

        :param data: The data to send to the client or clients. Data can be of
                     type ``str``, ``bytes``, ``list`` or ``dict``. If a
                     ``list`` or ``dict``, the data will be serialized as JSON.
        :param room: The recipient of the message. This can be set to the
                     session ID of a client to address that client's room, or
                     to any custom room created by the application, If this
                     argument is omitted the event is broadcasted to all
                     connected clients.
        :param skip_sid: The session ID of a client to skip when broadcasting
                         to a room or to all clients. This can be used to
                         prevent a message from being sent to the sender.
        :param namespace: The Socket.IO namespace for the event. If this
                          argument is omitted the event is emitted to the
                          default namespace.
        :param callback: If given, this function will be called to acknowledge
                         the the client has received the message. The arguments
                         that will be passed to the function are those provided
                         by the client. Callback functions can only be used
                         when addressing an individual client.
        :param ignore_queue: Only used when a message queue is configured. If
                             set to ``True``, the event is emitted to the
                             clients directly, without going through the queue.
                             This is more efficient, but only works when a
                             single server process is used. It is recommended
                             to always leave this parameter with its default
                             value of ``False``.

        Note: this method is a coroutine.
        """
        await self.emit('message', data=data, room=room, skip_sid=skip_sid,
                        namespace=namespace, callback=callback, **kwargs)