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Subject: [OASIS Issue Tracker] (MQTT-313) MQTT 5.0 WD07 CONNACK code Incompatible with MQTT 3.1 and MQTT 3.1.1


    [ https://issues.oasis-open.org/browse/MQTT-313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63857#comment-63857 ] 

Ed Briggs commented on MQTT-313:
--------------------------------

Closing based on feedback from the TC.

> MQTT 5.0 WD07 CONNACK code Incompatible with MQTT 3.1 and MQTT 3.1.1
> --------------------------------------------------------------------
>
>                 Key: MQTT-313
>                 URL: https://issues.oasis-open.org/browse/MQTT-313
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5
>            Reporter: Ed Briggs
>            Assignee: Ed Briggs
>
> The interoperability of CONNACK(unsupported protocol level) between MQTT 5.0 WD07 and MQTT 3.1.1 and MQTT 3.1 seems to be broken. My questions are 'is this a defect' and 'should it be changed'.
> MQTT 5.0 WD07 uses a different CONNACK return code for this condition as summarized  be low
> Ver           retval                                    retval
>                  0x01                                    0x84
> 3.1            unsupported prot. level       UNDEFINED-RESERVED
> 3.1.1         unsupported prot. level       UNDEFINED-RESERVED
> 5.0 WD07  UNDEFINED-RESERVED   unsupported protocol level
> As a consequence, the following useful exchanges no longer work
> 3.1 or 3.1.1 Client           5.0 WD07 Server
>     CONNECT 3.1       ->     
>                                    <-    CONNACK 0x84
>     UNSPECIFIED 
>                     - - - 
> 3.1 or 3.1.1 Client           5.0 WD07 Server
>     CONNECT 3.1.1    ->     
>                                    <-    CONNACK 0x84
>     UNSPECIFIED 
> 5.0 WD07 Client                 MQTT 3.1 or 3.1.1 Server
>      CONNECT 5.0      ->
>                                    <-    CONNACK 1
>      UNSPECIFIED 
> Comments
> I submit interoperability is necessary in this ONE particular case.



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