[sim-wg] TOSSIM and the 2.1 Release

[Philip Levis]

On Sep 20, 2007, at 10:55 AM, Chad Metcalf wrote:

> Resending to the group...
>
> On 9/20/07, Philip Levis <pal at cs.stanford.edu> wrote:
>> That is, whether the SF code is *in* TOSSIM, or is just Python code
>> included in the Python driver script. Don't forget, there's a TOSSIM
>> command that lets you inject packets to nodes. It currently only
>> works for radio packets, but adding the serial one would be trivial.
>> So you could just write Python code that processes SF packets and
>> calls inject() on TOSSIM. Or is that what you're doing?
>
> I've added the serial packet injection.
>
>  34 serialpkt = t.newSerialPacket();
>  35 serialpkt.setData(msg.data)
>  36 serialpkt.setType(msg.get_amType())
>  37 serialpkt.setDestination(0)
>  38 serialpkt.deliver(0, t.time() + 3)
>
> The SerialForwarder is a stand alone object written in C++ as a
> wrapper around C functions which link into the simulation itself. I
> also used SWIG to generate a Python wrapper so that it can be used in
> Python. But its only integrated into TOSSIM as much as regular packet
> injection is. I looked at how you did packet injection and basically
> mirrored it. And yes my C/C++ processes packets which then are
> injected.  Its in the TOSSIM module in Python because thats the way I
> had to do it to overcome build issues.
>
> Currently the way the extension is I have my own sim-sf.extra which
> builds sf support into TOSSIM. If you don't want it you run sim.extra
> and you don't get the overhead. My thought was to do something
> similar.
>
>>>> The one downside of pushing this into the scripting world is it  
>>>> makes
>>>> transitioning between C++ and Python harder.
>>>
>>> So is the thought going forward then that TOSSIM won't be supporting
>>> C++ based simulation drivers?
>>
>> No -- just that moving back and forth between Python and C++ might be
>> a bit trickier.
>
> This was the basis for my decision to write it in C/C++ with a Python
> wrapper. That way everyone gets access to the functionality.


Awesome. It sounds like a near-perfect design.

Phil