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Subject: [OASIS Issue Tracker] (MQTT-297) Packet Indentifier Leak on lost Subscription commands

    [ https://issues.oasis-open.org/browse/MQTT-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=65003#comment-65003 ] 

Ed Briggs commented on MQTT-297:

It is very easy to demonstrate the packet identifier leak, and I've seen it in some implementations (which is why I reported it.).  Accordingly, I find the statement that there is no case where packet identifiers are lost unpersuasive.  Since this is marked post MQTT 5.0, I don't see much value in further discussion at this point.

> Packet Indentifier Leak on lost Subscription commands
> -----------------------------------------------------
>                 Key: MQTT-297
>                 URL: https://issues.oasis-open.org/browse/MQTT-297
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>    Affects Versions: 3.1.1
>            Reporter: Ed Briggs
>            Priority: Minor
> If a SUBSCRIBE, SUBACK, UNSUBSCRIBE or UNSUBACK message is lost during transfer, the packet identifier is leaked.   The leak remains for the duration of the session, which in the case of CleanSession=0 could be indefinite, during which time additional loss of packet ids could occur.
> This cannot be fixed using the existing mechanisms, and is recorded here for future consideration (not MQTT 3.1.1. or MQTT 5.0). 

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