[OASIS Issue Tracker] (MQTT-501) Change type of Maximum Packet Size to Variable Byte Integer

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

    [ https://issues.oasis-open.org/browse/MQTT-501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=67128#comment-67128 ] 

Ken Borgendale commented on MQTT-501:
-------------------------------------

The actual maximum size of a packet is 2**28+4 as the variable byte integer remaining length does not include the size of the fixed header.  Therefore strictly a variable byte integer does not encode enough bits to represent this value.

One solution is to simply specify Maximum Packet Size as a Four Byte Integer and allow any value up to 2**32-1.  All values > 268,435,460 would give the same result as that value as no packet larger than this could be encoded.  Someone wishing to explicitly code unlimited could then jsut use UINT_MAX (0xFFFFFFFF).



> Change type of Maximum Packet Size to Variable Byte Integer
> -----------------------------------------------------------
>
>                 Key: MQTT-501
>                 URL: https://issues.oasis-open.org/browse/MQTT-501
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5, CSD01
>            Reporter: Ken Borgendale
>             Fix For: 5
>
>
> Please revise the type of Maximum Packet Size from Four Byte Integer
> to Variable Integer in 2.2.2.2, 3.1.2.11.5, and 3.2.2.3.5.
> Regards,
> Tatsuzo



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