[lwip-users] uIP: inconsistent docs and implementation quirks

[Henning Riedel]

Well, I'm trying to port uIP to 68332 as interim platform, until 68HC12 
hardware is here. I have an SMC91C111 eth module hooked.

I get a little pissed by the infos provided, which seem somehow 
inconsistent.

You write in your samples for device drivers, to take the header infos 
from uip_buf and the paylod from uip_appdata, but somehow it doesn't 
work quite as it should.

You define IP and TCP headers to be 20 bytes each, but when I sniff, 
some packets have e.g. 24 bytes TCP header. Though, there come up 
questions as, when does a driver needs to take data from uip_buf and 
when from uip_appdata? If the header is 24 bytes, will the options then 
be in uip_buf or uip_appdata, as you say, application can put 
uip_appdata somewhere else.