[lwip-users] [lwip] PPP

[Adam Dunkels]

Hi!

By browsing through Phil's cleaned up version of James Carlson's PPP code, I 
see no particular problems in porting the code to lwIP. The biggest changes 
will be to the set_up_tunnel() and read_packet() functions which now reads 
packets from UDP sockets. Also, the state->inbuffer should be changed to 
using lwIP's pbufs instead.

I have not looked through the code enough to be able to completely understand 
it (my lack of PPP-knowledge doesn't really make things better, either) but 
to me it seems as if the code only implements the PPP negotiation stuff and 
not the HDLC-like framing. So this would have to be added as well.

If code size matter, things doesn't really look promising; James' PPP code 
compiles to nearly 13k. That is 4k more than the lwIP TCP! (And I thought 
that TCP was large...) The good news is that the PPP code includes 
initalization code and debugging output abilities, which means that it is 
possible to reduce the size.

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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