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Subject: [OASIS Issue Tracker] (MQTT-251) Return server assigned client id to client


    [ https://issues.oasis-open.org/browse/MQTT-251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59326#comment-59326 ] 

Ken Borgendale commented on MQTT-251:
-------------------------------------

I very much dislike allowing generated client id with cleansession=0.  This just seems like an case of orphaned resources waiting to happen. However, I do not object too much as long as we make it clear that the server is not required to allow cleansession=0 in this case, even if it allows a zero length client id.  

Returning the generated client id in the CONNACK makes it potentially a 64K long packet which I assume some clients would not like.   Of course it is unlikely that any server would construct such a client id, but returning this means that the client knows that the server will not give it a CONNACK which is "too big".

> Return server assigned client id to client
> ------------------------------------------
>
>                 Key: MQTT-251
>                 URL: https://issues.oasis-open.org/browse/MQTT-251
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: futures
>            Reporter: Allan Stockdill-Mander 
>
> In the 3.1.1 specification section 3.1.3.1 http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718031 it is permitted for a client to connect with a zero length client id, the server internally uses a unique identifier for that client but the client does not know the idenfitier and is required to connect with clean session true.



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