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Re: [6tisch] CoAP resource management - draft-ietf-6tisch-coap-02

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Wed, 12 November 2014 07:55 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, "Raghuram Sudhaakar (rsudhaak)" <rsudhaak@cisco.com>
Thread-Topic: [6tisch] CoAP resource management - draft-ietf-6tisch-coap-02
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Date: Wed, 12 Nov 2014 07:55:36 +0000
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Subject: Re: [6tisch] CoAP resource management - draft-ietf-6tisch-coap-02
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> 
> Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:
>     > Michael I believe ³version data² may be a misleading word I used in the
>     > previous email. What I meant is the version number.
> 
>     > The version number uniquely identifies the set of 6top resources that
>     > can be accessed on a node. Version number is bumped up when a resource
>     > is added, renamed or deleted.
> 
> okay, you mean the version of the 6top API; versions are created by standards
> action...
> 
>     > Heterogenity may arise when new nodes (running an updated
>     > implementation which may have added a new resources) are added to
>     > existing deployments.  Heterogenity is entirely w.r.t the version
>     > number (and consequently the set of 6top resources that can be accessed
>     > on the nodes).
> 
> Yes, I agree this is an interesting issue.
> The problem is what do you do when a v2 node tries to talk to a v1 node... we
> need to think about this now, I agree.  I think this is most acute in the minimal
> case, as otherwise the PCE can have a notion about what the range of versions
> available are, and can cope...  The PCE can speak all versions, so this means that
> the nodes do not have to support more than one version.
> But, in the minimal case, they have to talk to each other, so there has to be a
> discovery process and some adaptation.
> 
[PT] 
Exactly

[PT] Pascal

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