Late Joining for Keyed Topics - Propagate History QoS from DDS (e.g. KEEP_LAST_HISTORY_QOS: 1) #526
Description
Describe the feature
DDS supports late joining for DataReaders, which supports use cases for keyed topics that a reader can get messages after they were produced (e.g. when the Zenoh Router joins the network in operation after the initial setup on the fly):
DDS Configs:
<history>
<kind>KEEP_LAST_HISTORY_QOS</kind>
<depth>1</depth>
</history>
Advanced Subscriber/Publisher of Zenoh Core might be usable to emulate that QoS behavior derived from the DDS history QOS definition.
Concrete Use Case:
DDS object are keyed by a UUID. For each UUID, a last position is propagated. It should be possible for any client application to get the last position of all DDS object when the initialy connect to the DDS domain behind the Zenoh Router.