[OASIS Issue Tracker] (MQTT-387) 3.3.2.6 Topic Alias. - comments

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    [ https://issues.oasis-open.org/browse/MQTT-387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=64819#comment-64819 ] 

Brian Raymor edited comment on MQTT-387 at 1/12/17 11:28 AM:
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[Withdrawn]


was (Author: brianraymor):
1761 A Topic Alias of 0 is not permitted. A sender MUST NOT send a PUBLISH packet containing a Topic
1762 Alias which has the value 0.

I'd move this earlier in the section. Perhaps:

1739 A Topic Alias is an integer value that can be used to identify the Topic, instead of including the full Topic
1740 Name.

A Topic Alias is a non-zero integer value ... including the full Topic Name. A sender MUST NOT send a PUBLISH packet containing a Topic
Alias which has the value 0.

-or-

The sender establishes an alias by including a non-zero length Topic Name and a Topic Alias value in the PUBLISH packet. The Topic Alias MUST NOT have a value of 0.




> 3.3.2.6 Topic Alias. - comments
> -------------------------------
>
>                 Key: MQTT-387
>                 URL: https://issues.oasis-open.org/browse/MQTT-387
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: edits
>    Affects Versions: 5, wd10
>            Reporter: Brian Raymor
>            Priority: Trivial
>             Fix For: 5, wd10
>
>
> I would reverse the order of the paragraphs - 1743 and 1747. The flow follow the order of the process.
> 1747 The sender decides whether to use an alias and chooses the alias value. It establishes an alias by
> 1748 including a non-zero length Topic Name and a Topic Alias value in the PUBLISH packet. When it receives
> 1749 a packet like this the receiver processes the packet as normal, but it also records the mapping of Topic
> 1750 Alias to full Topic Name.
> The sender establishes an alias by including a non-zero length Topic Name and a Topic Alias value in the PUBLISH packet. When it receives such a packet, a receiver processes it as normal and also records the mapping of Topic Alias to its corresponding Topic Name.
> 1743 If a Topic Alias has been established at the receiver a sender is permitted to send a PUBLISH packet that
> 1744 contains that Topic Alias and supplying a zero-length String in place of the Topic Name.
> Once a Topic Alias has been established at the receiver[,], a sender is permitted to send a PUBLISH packet that contains that Topic Alias and a zero-length String in place of the Topic Name.



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