def default(request):
    """
        Called when a default node configuration request has been received.

        @param request: The publish-subscribe request.
        @type request: L{wokkel.pubsub.PubSubRequest}
        @return: A deferred that fires with a C{dict} representing the default
                 node configuration. Keys are C{str}s that represent the
                 field name. Values can be of types C{unicode}, C{int} or
                 C{bool}.
        @rtype: L{Deferred<twisted.internet.defer.Deferred>}
        """
