Re: [Iotsi] New IoT effort at schema.org

Eliot Lear <lear@cisco.com> Tue, 23 August 2016 11:06 UTC

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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, Tim Coote <tim@coote.org>, David Janes <davidjanes@davidjanes.com>
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From: Eliot Lear <lear@cisco.com>
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Date: Tue, 23 Aug 2016 13:06:46 +0200
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Cc: "iotsi@iab.org" <iotsi@iab.org>, Ted Hardie <ted.ietf@gmail.com>, Internet Architecture Board <iab@iab.org>
Subject: Re: [Iotsi] New IoT effort at schema.org
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Hi Hannes,


On 8/23/16 12:56 PM, Hannes Tschofenig wrote:
> Eliot, Tim,
>
> I believe you are talking about two different types of states.
>
> The information you are talking about, Eliot, is rather static and does not change whereas my reading of the email Tim sent was more about information that sensor and actuators exhibit.
>
> Is my understanding correct? Tim, maybe you can elaborate a bit more about the ' overall system state' you are referring to.

Tim wrote:
> However, there is a significant issue that the deployed Things do not
> necessarily tell (or know) the truth about what they are or their
> current state.

It's the "who they are" part below that I'm working on now.  That's what
MUD+802.1AR gives you.  In that case, as I wrote, the assertion is from
the manufacturer of the Thing, and not the Thing itself.  As to the
device's operational state, that gets us into other areas that is not
unique to Things, and leads us toward the age old question: “how do you
know whether a device is sane or has been hacked?”  And there are ways
to address that, imperfect though they may be.

Eliot