[OASIS Issue Tracker] (MQTT-372) 3.2.2.6 Maximum QoS - comments

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    [ https://issues.oasis-open.org/browse/MQTT-372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=65307#comment-65307 ] 

Rahul Gupta commented on MQTT-372:
----------------------------------

Sorted in WD-11

> 3.2.2.6 Maximum QoS - comments
> ------------------------------
>
>                 Key: MQTT-372
>                 URL: https://issues.oasis-open.org/browse/MQTT-372
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: edits
>    Affects Versions: 5, wd10
>            Reporter: Brian Raymor
>            Assignee: Rahul Gupta
>            Priority: Minor
>             Fix For: 5, wd11
>
>
> 1. This section feels a bit repetitive. It tells me a little bit:
> 1387 A Server is NOT REQUIRED to support QoS 1 or QoS 2 PUBLISH packets. If this is the case it MUST
> 1388 include a Maximum QoS Advertisement in the CONNACK packet.
> then it tells me a little bit more about Maximum QoS Advertisement after a pause:
> 1392 If a Server does not support QoS 1 or QoS 2 PUBLISH packets, it MUST send a Maximum QoS
> 1393 Advertisement containing the highest QoS it supports and MUST support all lower QoS Levels in addition
> 1394 to the value contained in the advertisement.
> This could be compressed into one paragraph which would flow better.
> 2. It's the only case where "[Aa]dvertisement" is used. 
> 3. There's a similar "flow problem below. I'd merge the Client and Server cases for a PUBLISH packet exceeding Maximum QoS together ...
> 1397 If a Client receives a Maximum QoS Advertisement from a Server, it MUST NOT send PUBLISH packets
> 1398 at a QoS level exceeding the Maximum QoS level specified.
> 1399
> 1400 If a Server receives a CONNECT message containing a Will QoS that exceeds its capabilities, it MUST
> 1401 reject the connection. It MAY send a CONNACK with a Return Code QoS-NOT-SUPPORTED and MUST
> 1402 close the transport connection.
> 1403
> 1404 If a Server has sent a Maximum QoS property, and it receives a QoS > 0 PUBLISH packet that exceeds
> 1405 the advertised maximum, this constitutes a Protocol Error and the Server must send a DISCONNECT
> 1406 packet with the Return Code QoS-NOT-SUPPORTED and disconnect the transport connection.
> 4. This section is a bit confusing because there's a CONNACK Maximum QoS property and a SUBSCRIBE Maximum QoS Subscription Option. It wouldn't hurt to be more specific.
> 1412 ... If
> 1413 this is the case, the Client simply restricts the maximum QoS field in any SUBSCRIBE commands it
> 1414 sends to a value it can support. A Client MUST NOT send a Maximum QoS Advertisement to the Server.



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