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Re: [core] Benjamin Kaduk's Discuss on draft-ietf-core-senml-14: (with DISCUSS and COMMENT)

Klaus Hartke <hartke@projectcool.de> Sun, 13 May 2018 17:21 UTC

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From: Klaus Hartke <hartke@projectcool.de>
Date: Sun, 13 May 2018 19:20:40 +0200
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To: Michael Koster <michaeljohnkoster@gmail.com>
Cc: Alexey Melnikov <aamelnikov@fastmail.fm>, Benjamin Kaduk <kaduk@mit.edu>, The IESG <iesg@ietf.org>, core <core@ietf.org>, "core-chairs@ietf.org" <core-chairs@ietf.org>, "draft-ietf-core-senml@ietf.org" <draft-ietf-core-senml@ietf.org>
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Subject: Re: [core] Benjamin Kaduk's Discuss on draft-ietf-core-senml-14: (with DISCUSS and COMMENT)
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+1



On Sat 12. May 2018 at 23:15, Michael Koster <michaeljohnkoster@gmail.com>
wrote:

> +1
>
> Michael Koster
>
> On May 12, 2018, at 2:02 PM, Alexey Melnikov <aamelnikov@fastmail.fm>
> wrote:
>
> Hi Ari,
>
> On 11 May 2018, at 20:05, Ari Keränen <ari.keranen@ericsson.com> wrote:
>
> Hi all,
>
> While addressing the IESG review comments regarding the use of time in
> SenML we came up with a simple way to enable SenML Records to express also
> relative times in the future that would have minimal impact to any existing
> use of SenML. We could use the following definition:
>
>   Values greater than or equal to 2**28 represent an absolute time
> relative to the Unix epoch. Values less than 2**28 represent time relative
> to the current time.
>
> That is, instead of only values less than zero, also values less than
> 2**28 (268,435,456) would be used to express relative time. Negative values
> and zero are still times in past and "now" respectively, as before. Time
> values from zero to 2**28 would be relative times in the future.
>
> The only change this causes in the current use of SenML is that the
> smallest absolute time expressible in SenML becomes 1978-07-04 21:24:16 UTC
> instead of 1970-01-01 00:00 UTC. The absolute times after 1978 are still
> exactly the same ("Seconds after Unix epoch"). We are not aware of any
> deployments with SenML data between 1970 and 1978 that would be impacted
> negatively by this.
>
> For details, see:
> https://github.com/core-wg/senml-spec/pull/129/files
>
> Would anyone have concerns about including this change in SenML before
> publication?
>
> Since we are already very late in the process and we need to get SenML
> published as RFC very soon, we would also need to agree on this very soon.
>
>
> No objections from me personally, but please double check with the WG.
>
> Best Regards,
> Alexey
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