RE: [lwip-users] multicast and porting issue.

[PELISSIER Christophe]

Thanks for your response Simon

I am interrested in all information from the people using multicast application 
in the mailling list .
In my understanding, when you want to open a socket with a multicast address, 
the application should "register" for a multicast address toward the stack 
(using setsockopt in BSD API). Then the stack should register for this 
multiscast address toward the Ethernet driver. I haven't seen any thing in 
socket.c but because lwip has its own netconn API it can be located elsewhere.
  
For the documentation, i just wanted to be sure that i haven't miss "some 
think".

Regards,
Christophe

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of address@hidden
Sent: Wednesday, May 20, 2009 9:19 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] multicast and porting issue.

PELISSIER Christophe wrote:
> One point is not clear for me, is Lwip able to manage multicast 
> address? can we bind, send and receive on multicast address using BSD 
> like interface?

If I remember correctly, when things like IGMP are turned off, lwIP should not 
make a difference between unicast and multicast. However, I'm not completely 
sure. If Frédéric would read this, maybe he could clarify it (as one of the 
active developers, he has already used lwIP for multicast protocols, so it must 
be working _somehow_).
> Second point is there a porting guide documentation (except wiki)?

I know this answer is not what you'd like it to be, yet maybe what you've 
expected: as an open source project which is driven mainly by people working on 
it in their free time or as part of their company's project, public 
documentation is not as extensive as many of us would like it to be... As with 
many open source projects, unfortunately most of the 'documentation' lies in 
the source code itself and the developer's brains :-(

Nevertheless, if you take the win32 port (maintained mainly by Frédéric and me) 
as an example, things should be great ;-)

Oh, and if you ever feel like writing documentation (especially as a beginner 
who still sees the possible abnormalties in lwIP), please feel free to put your 
know-how in the wiki! After all, the wiki in some respects already provides 
more information than the txt doc files in CVS, thanks to our users!

Simon


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