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Re: [Lwip] Discussion about IoT Device Classes

Oliver Hahm <oliver.hahm@inria.fr> Fri, 03 February 2017 11:35 UTC

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Date: Fri, 03 Feb 2017 12:35:09 +0100
From: Oliver Hahm <oliver.hahm@inria.fr>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>
Message-ID: <20170203113509.GA8117@hobbykeller.org>
References: <2e19e2da-f86d-3889-690d-4d624a2c4489@gmx.net> <132DAB99-A623-47CD-9636-7DF67D75C188@tzi.org> <F3B7F8F0-F8B4-4B57-92F6-22701D85787B@tzi.org> <2d9cf5f4-431c-a7ba-08a5-fd506b15912d@gmail.com> <CANK0pbZ8GAqfkZBk7u1xHVCL=befZHm7DY_Y0jZurwZKcU9i0w@mail.gmail.com> <f7bc46a7-8999-d1fa-9f1f-8c11975d7f5c@gmx.net> <20910.1485973931@obiwan.sandelman.ca> <f0bab42a-008a-a6fb-8bdb-d5c759dad0f8@gmx.net>
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Cc: Michael Richardson <mcr+ietf@sandelman.ca>, "lwip@ietf.org" <lwip@ietf.org>
Subject: Re: [Lwip] Discussion about IoT Device Classes
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Hi Hannes!

On Wed, Feb 01, 2017 at 07:54:03PM +0100, Hannes Tschofenig wrote:
> On 02/01/2017 07:32 PM, Michael Richardson wrote:
> >     > PS: I am not sure about the "motes". Are you talking about BLE beacons?
> > 
> > It's a good example. But really anything that basically can never be field
> > upgraded.
> 
> I guess I am fine calling them class 0 devices that are basically
> outside our scope since they do not run IP.

I'm not so sure we should discard these devices so hasty. Sure, with just some
tens of bytes of RAM, you won't be able to implement 6lowpan-HC or DTLS. But
as soon as we have some kilobytes of RAM (let's say 5kB as on some MSP430
motes), simple IPv6 connectivity is possible, if its functionality is well
defined. As far as I know, current IPv6/6lo specifications do not consider
unidirectional devices, but is there anything wrong in a simple sensor that
just broadcasts (multicasts) its sensor values to a hardwired IPv6 address
(e.g., ff02::2)?

Cheers,
Oleg

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