[Tinyos-devel] net2 goals/timeline for 2.1.1

[Eric Decker]

I am currently wacking on encapsulation code in tinyos and would like a more
concise descriptionof the packet format discussed below.  Can you point me
at the header files in the current tree (t2)
that lays all this stuff out.

Or if there is a brief layout that shows packet offsets and dispatch values.

In particular I'm interested in what happens at boundary between
15.4/6lowpan
and again at 6lowpan/nalp/AM

How do we know what comes after the 15.4 header (dispatch value/type field)
and
how do we know what comes after 6lowpan/nalp, again what says the rest of
the
packet should be interpreted as AM.

eric


On Fri, Jun 12, 2009 at 12:08 PM, Stephen Dawson-Haggerty <
stevedh at eecs.berkeley.edu> wrote:

> The major issue for core is the frame format.  The 6lowpan standard
> when used over 802.15.4 requires the 6lowpan payload to start
> immediately following the 802.15.4 frame header; the first byte is an
> IANA assigned dispatch value.
>
> This dispatch value is the same as the "network" field when I-frames
> are enabled, and so it is possible to have a radio stack which
> supports both Active Messages and other network protocols.  This is
> pretty much the same as the dispatching of packets base on the
> ethernet header in other systems-- IP and non-IP protocols can
> coexist.
>
> Conceptually, the layering would be (for AM)
> --------------------------
> | 802.15.4 | network (6LOWPAN_NALP) | AM  | ...
> --------------------------
>
> What is needed is an interface to intercept the non-NALP network
> values and feed them into blip, and an interface to allow blip to send
> packets with its own (arbitrary) network ids.
>
> Steve
>
>
> On Fri, Jun 12, 2009 at 11:37 AM, Omprakash Gnawali<gnawali at usc.edu>
> wrote:
> > We would like to include bls and blip in 2.1.1. We will be ready by
> > the end of August.
> >
> > During net2 meeting, we discussed what (software/suggestions) we would
> > need from core for that to happen. Steve will send a follow-up email
> > on that.
> >
> > Thanks.
> >
> > - om_p
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> >
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> >
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-- 
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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