Re: [lwip-users] Queueing up UDP packets in RAW api

[Sergio R. Caprile]

Talking about backfire: looking for the address info inside a pbuf 
violates the layer independency (someone's got to play the pedantic 
role...), so I would not rely on that unless willing to chase all sort 
of strange problems in the field and/or future lwIP versions.
I would use the pbuf functions like pbuf_cat() for the queueing (there's 
an example in the httpd code) and the standard procedures to obtain the 
other layer info.
If you get msgs from many sources, roll your own structure with all the 
info and a pointer to the pbuf, and queue those instead. Just an idea. 
Get the sender from your callback arguments, you don't need to unroll 
the pbuf