Re: [Iotsi] New IoT effort at

Hannes Tschofenig <> Tue, 23 August 2016 10:56 UTC

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From: Hannes Tschofenig <>
To: Eliot Lear <>, Tim Coote <>, David Janes <>
Thread-Topic: [Iotsi] New IoT effort at
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Cc: "" <>, Ted Hardie <>, Internet Architecture Board <>
Subject: Re: [Iotsi] New IoT effort at
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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.


-----Original Message-----
From: Iotsi [] On Behalf Of Eliot Lear
Sent: 23 August 2016 12:53
To: Tim Coote; David Janes
Cc:; Ted Hardie; Internet Architecture Board
Subject: Re: [Iotsi] New IoT effort at

Hi Tim,

On 8/23/16 10:58 AM, Tim Coote wrote:
> Hullo
> Based on practical experience, one of the biggest challenges is to
> have a view of the overall system state. This is partly covered in the
> concepts of interim (interstitial?) states in this paper, but bugs and
> potential bugs in composed components need to be accounted for (I
> think). This degree of uncertainty can be modelled, but probably not
> in the hardware scope of Things themselves as they tend to be
> under-powered.*
> 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.

This is the exact use case we have focused on in our work.  The approach we take to address that is MUD+802.1AR so that assertions are made by the manufacturer of the Thing and not the Thing itself.  I'll have more to say about the latter later.


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