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Subject: [OASIS Issue Tracker] (MQTT-474) If the packet has a zero length Topic Name field ...which Reason Code is appropriate?


    [ https://issues.oasis-open.org/browse/MQTT-474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=66657#comment-66657 ] 

Ken Borgendale commented on MQTT-474:
-------------------------------------

The original discussion of 0x94 (Topic Alias invalid) is that it is outside of the valid range (>Maximum Topic Alias) and it is so documented.

I do not see any requirement for this change.

> If the packet has a zero length Topic Name field ...which Reason Code is appropriate?
> -------------------------------------------------------------------------------------
>
>                 Key: MQTT-474
>                 URL: https://issues.oasis-open.org/browse/MQTT-474
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5, wd14
>            Reporter: Konstantin Dotchkoff
>            Priority: Minor
>             Fix For: 5, wd14
>
>
> This issue was originally reported in MQTT-417.
> Line 2037-2039
> "3)	If the receiver does not already have a mapping for this Topic Alias
> a)	If the packet has a zero length Topic Name field it is a Protocol Error and the receiver uses DISCONNECT with Reason Code of 0x82 (Protocol Error) as described in section 4.13."
> Why not use Return Code of 0x94 Topic Alias invalid?



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