When publishing an event, the publisher can set an option
retain=True) in the
PublishOptions which will cause the Broker
to retain the event being published as the most-recent event on this
Note that Event History is similar to this feature, but not the same.
No configuration is required in Crossbar in order to take advantage of this; it is up to the publisher.
Retrieving an Event¶
Upon subscription, a client can pass
get_retained=True in the
SubscribeOptions. If there is any retained event, it will be
immediately sent to the subscriber.