RE: [lwip-users] UPnP on lwip

[Robert Brown]

I built a product that contains a UPnP control point using lwIP.  We use
UPnP to automatically discover and manage Internet Gateways.  Sending and
receiving multicast UDP was no problem.  All you need to do is create a
network interface with the UPnP IP multicast address.  Strictly speaking,
AutoIP is not really required but I guess it depends on what your product is
supposed to do.  As far as I know, lwIP does not do AutoIP.

As for pleasure or pain...
It wasn't all that painful to build the UPnP control point.  I haven't built
a UPnP device and so can't comment on that.
The most daunting part for me was where to get an xml library.  My product
runs a proprietary OS so there was nothing readily available.  In the end, I
found an open source UPnP SDK from Intel.  I used the xml library from the
SDK and built the rest of it from scratch on top of lwIP.  If you are
building a fairly simple device or control point then I would suggest that
you take a hard look at your make/buy decision.  You may be better off doing
it yourself.

I don't have a link to the Intel SDK but I do have the original source code.
The license permits distribution of the source.  If you want to have a look
then send me an email at address@hidden and I will make it available
to you.

The biggest pain was in achieving interoperability with the devices I needed
to discover and control.  The implementations vary quite a bit from vendor
to vendor so lots of testing and tweaking was required.

Regards,
Robert Brown




-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf
Of Ian Oliver
Sent: January 25, 2005 8:39 AM
To: address@hidden
Subject: [lwip-users] UPnP on lwip


Greetings all.

We're considering using lwIP to build a UPnP embedded product. Perhaps
with the UPnP software from Allegrosoft. Of course, Allegrosoft want to
sell us their IP stack, but we also want to have "our own" stack for
other projects so just porting one makes sense and we like what we've
seen of lwIP.

However, I'm told that for UPnP we need -
1) multicast UDP   I think lwIP has this. Correct?
2) zeroconf/AutoIP/Link-Local, call it what you will. I'm fairly sure
lwIP doesn't have this. Correct?

Can someone kindly confirm whether I'd read the docs/code/situation
correctly?

Anyone else put UPnP on top of lwIP and like to comment on whether
we're in for a pleasant experience or a whole world of pain?

Many thanks

Ian Oliver





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