Hi
Allow me to pitch in a bit... :) This post contains zero content related to
Ethos and some opinions related to CoAP.
>> Well, actually it doesn't. It just allows to multiplex different
>> channels over one serial interface, currently ethernet and a serial stream.
>
> Right, in that sense it is similar to slipmux )except that we focused on IP
> packets instead of Ethernet packets — not yet sure why you’d want to do the
> latter).
There are numerous research projects focusing on replacing everything between
L2 and pure information theory. I'm sure this is not unique. I'm personally
involved in http://point-h2020.eu/ <http://point-h2020.eu/> in which the aim is
to produce a better routing for IP than "traditional IP routing + CDN + content
aware caching + wibbly wobbly" does.
So yes, being able to tunnel anything over X instead of tunneling IP over X is
definitely a good thing.
Basically all over the world people are realizing that while Metcalfe hit very
close to something pure, the upper layers are just axioms that may indeed be
placed wrongly. So definitely there is a reason to tunnel L2 instead of L3. Of
course this does not render L3 tunneling as unnecessary.
> The point of doing CoAP over serial, with no IP in between, is that you can
> use it to configure the node, including IP.
> (There is nothing in slipmux that would stop you from also doing CoAP over
> IP, of course, but the latter is not useful for initial basic node
> configuration, and IP may also get in the way of certain management and
> diagnostic operations that CoAP over serial would do well.)
I think being able to CoAP over anything is good for agnosticism. Not only of
protocol but that our familiar layering is by no means the only possible one.
CoAP over serial is not that much different to CoAP over SMS or CoAP over avian
carrier (we need an rfc though). I also think that CoAP over X with no IP in
sight is perfectly valid for actual use instead of just covering the system
bootstrapping phase.
- t
P.S. CoAP over Modbus anyone?
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