[ https://issues.oasis-open.org/browse/MQTT-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61688#comment-61688 ]
Ian Craggs commented on MQTT-276:
---------------------------------
I think that the list of optional features is:
* QoS 2
* retained publications
* cleansession false
and that maximum message size belongs into a separate category of "constraints". "Constraints" or limits, could also include maximum number of outstanding QoS 2 messages.
I also think that advertising server capabilities is fine, but we do not want to have capability negotiation, which would add too much complexity.
> MQTT enhancements for large scale distributed systems
> -----------------------------------------------------
>
> Key: MQTT-276
> URL: https://issues.oasis-open.org/browse/MQTT-276
> Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
> Issue Type: New Feature
> Components: futures
> Affects Versions: 3.1.1
> Reporter: Konstantin Dotchkoff
> Assignee: Konstantin Dotchkoff
> Fix For: 3.1.1
>
>
> As presented during the TC call on 8/6/2015, there are challenges in implementing MQTT in large scale distributed systems with the specific case being QoS 2:
> https://www.oasis-open.org/apps/org/workgroup/mqtt/download.php/56237/MQTT%20QoS2%20Considerations.pptx
> Retained messages were also noted during the call.
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