[OASIS Issue Tracker] (MQTT-385) Simple clients skipping properties

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

    [ https://issues.oasis-open.org/browse/MQTT-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=65151#comment-65151 ] 

Andrew Banks commented on MQTT-385:
-----------------------------------

I've deleted the following comments from the WD11 specification and added them here instead.

Current specification line 1233 on:

A Client MAY process the packet without validating the Properties    by skipping over the number of bytes specified by Property Length.  A Client that does not validate the Properties MUST NOT make use of any Property it has not validated.   A Server MUST validate all Properties in a MQTT Control Packet.

Peter Niblett : “checking” isn’t defined. I guess it is referring to the previous paragraph.

Ken Borgendale: I change the word to validate.  I think both check and validate are common enough English words to not require further definition

Peter Niblett;There is a bit of ambiguity here.  Is a client permitted to validate only some of the properties? Or is it a binary choice between validating all the properties or skipping (and ignoring) them all ?

> Simple clients skipping properties
> ----------------------------------
>
>                 Key: MQTT-385
>                 URL: https://issues.oasis-open.org/browse/MQTT-385
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: edits
>    Affects Versions: 5, wd10
>            Reporter: Brian Raymor
>            Assignee: Ken Borgendale
>            Priority: Minor
>             Fix For: 5
>
>
> What is the rationale for this exemption -and- how is it interoperable?
> 757 A Client MAY process the Packet without checking the Properties by skipping over the number of bytes
> 758 specified by Property Length. A Client which does not check the Properties MUST NOT make use of any
> 759 Property it has not checked. A Server MUST check all Properties in a Control Packet.
> 760
> 761 Non normative comment
> 762 This exemption for Clients is designed to allow for simple Clients that do not require the
> 763 information sent in Properties. A full function Client should check and use the information in the
> 764 Properties.



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