Send a server-generated SocketIO message.

        This function sends a simple SocketIO message to one or more connected
        clients. The message can be a string or a JSON blob. This is a simpler
        version of ``emit()``, which should be preferred. This function can be
        used outside of a SocketIO event context, so it is appropriate to use
        when the server is the originator of an event.

        :param data: The message to send, either a string or a JSON blob.
        :param json: ``True`` if ``message`` is a JSON blob, ``False``
                     otherwise.
        :param namespace: The namespace under which the message is to be sent.
                          Defaults to the global namespace.
        :param room: Send the message only to the users in the given room. If
                     this parameter is not included, the message is sent to
                     all connected users.
        :param skip_sid: The session id of a client to ignore when broadcasting
                         or addressing a room. This is typically set to the
                         originator of the message, so that everyone except
                         that client receive the message.
        :param callback: If given, this function will be called to acknowledge
                         that 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.

def send(self, data, json=False, namespace=None, room=None,
             callback=None, include_self=True, skip_sid=None, **kwargs):
        """Send a server-generated SocketIO message.

        This function sends a simple SocketIO message to one or more connected
        clients. The message can be a string or a JSON blob. This is a simpler
        version of ``emit()``, which should be preferred. This function can be
        used outside of a SocketIO event context, so it is appropriate to use
        when the server is the originator of an event.

        :param data: The message to send, either a string or a JSON blob.
        :param json: ``True`` if ``message`` is a JSON blob, ``False``
                     otherwise.
        :param namespace: The namespace under which the message is to be sent.
                          Defaults to the global namespace.
        :param room: Send the message only to the users in the given room. If
                     this parameter is not included, the message is sent to
                     all connected users.
        :param skip_sid: The session id of a client to ignore when broadcasting
                         or addressing a room. This is typically set to the
                         originator of the message, so that everyone except
                         that client receive the message.
        :param callback: If given, this function will be called to acknowledge
                         that 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.
        """
        skip_sid = flask.request.sid if not include_self else skip_sid
        if json:
            self.emit('json', data, namespace=namespace, room=room,
                      skip_sid=skip_sid, callback=callback, **kwargs)
        else:
            self.emit('message', data, namespace=namespace, room=room,
                      skip_sid=skip_sid, callback=callback, **kwargs)