[OASIS Issue Tracker] (MQTT-325) Use Disconnect RC 0x82 in place of Nack for incorrect Packet Id.

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

    [ https://issues.oasis-open.org/browse/MQTT-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=64544#comment-64544 ] 

Andrew Banks commented on MQTT-325:
-----------------------------------

Agreed to reword the spec to describe these situations as(potential)  protocol errors but that  the protocol continues
having reported the (Potential) error. IE do not disconnect.

> Use Disconnect RC 0x82 in place of Nack for incorrect Packet Id.
> ----------------------------------------------------------------
>
>                 Key: MQTT-325
>                 URL: https://issues.oasis-open.org/browse/MQTT-325
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: edits
>    Affects Versions: 5, wd09
>            Reporter: Andrew Banks
>
> The following return codes amount to a protocol error:
> PubRel 0x92	PacketID not found 
> PubComp 0x92	PacketID not found
> Suback 0x91	PacketID in use
> so we should send DISCONECT RC 0x82	Protocol error
> followed by network disconnect instead. Otherwise we risk corrupting data because either the client or server implementation is bad or their state has been corrupted.
> The same thing could happen on Publish / PubRec / PubAck , Unsunscribe/Unsuback as well.
> This is the same methodology as was adopted in Jira MQTT-311



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