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Re: [core] PubSub - Questions round 1

Ari Keränen <ari.keranen@ericsson.com> Tue, 20 March 2018 14:27 UTC

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From: Ari Keränen <ari.keranen@ericsson.com>
To: Jim Schaad <ietf@augustcellars.com>
CC: core <core@ietf.org>, "draft-ietf-core-coap-pubsub@ietf.org" <draft-ietf-core-coap-pubsub@ietf.org>
Thread-Topic: PubSub - Questions round 1
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Date: Tue, 20 Mar 2018 14:27:15 +0000
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Subject: Re: [core] PubSub - Questions round 1
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Hi Jim,

> On 20 Mar 2018, at 8.12, Jim Schaad <ietf@augustcellars.com> wrote:
>> From: Ari Keränen <ari.keranen@ericsson.com>
>> Sent: Monday, March 19, 2018 7:25 PM
>>> On 14 Sep 2017, at 7.10, Jim Schaad <ietf@augustcellars.com> wrote:
>>> 
>>> 1  I am not clear what the visibility of the intermediate subtopic
>>> notes should be.  Should these nodes appear in the link list when
>>> doing a GET on the root of the pub-sub tree?  Should these nodes
>>> appear when doing a discovery on /.well-known/core?
>> 
>> I think the explicitly created topics should be visible in discovery.
> However,
>> this includes the "main topics" created with CREATE interface. Perhaps the
>> sub-topics under a main topic could be hidden from the root discovery
> since
>> they can be discovered from the main topic.
>> 
>> But would be great to hear more opinions on this.
> 
> No, that is not what I asked.  If I do a create of the topic
> 
> /PubSub/Hidden/MyTopic
> 
> Hidden has not yet be created as a topic so it will be implicitly created.
> When I do the GET, I expect that MyTopic would be visible as part of the
> link list but I am not clear that Hidden would be returned in the link list
> because nobody explicitly created it.

Yes, "Hidden" part would not be ever visible alone, only as part of the full "/PubSub/Hidden/MyTopic" topic.

The "implicitly created" Hidden topic is not actually a stand-alone topic at all. You can create stand-alone "parent" topics using the link format ct. 

I started yesterday to write a PR on this topic:
https://github.com/core-wg/pubsub/pull/23/files

Also related editorial fixes:
https://github.com/core-wg/pubsub/pull/20/files

Comments very welcome!


Cheers,
Ari

[clipped two other questions that are waiting for answer from someone else]

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