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

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

    [ https://issues.oasis-open.org/browse/MQTT-251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59310#comment-59310 ] 

Allan Stockdill-Mander  commented on MQTT-251:
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In the lifetime of a client the bytes of passing back a client id are likely to be minimal, options are complexity and would this option really be beneficial? If I'm asking the server to assign me a client id and I want to know what that id is presumably it's because I want some state to be stored by the server. Apart from app debugging (which could still use cleansession false) I can't currently think of a good reason to have no session and need your client id (even if it might be nice).
In which case we could just formalise it that requesting a server assigned id with cleansession false will result in the id being returned, cleansession true and it will not.

> 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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