Hi!

you say
 
 3/ Our main interrest with LwIP was to use DHCP. By reading the dhcp.c
file, it says the following things:
    - change LWIP_DHCP to 1 in lwipopts.h which is in the port
directory.
    - change value of DHCP_COARSE_TMR and another one so that the first
one is called every 60s and the other 500ms.
    - then call the respective functions for these values and call
dhcp_start(struct netif);
 
that sounds that somehow your dhcp code isn't built or something
similar. I had the same problem, but in may case it was the LWIP_DHCP
define. Are you sure you "updated" your projekt so that after a change
in your projekt all c files are recompiled with the different define in
the .h files? with GCC you have to do a make clean that such changes are
done..
Or maybe you forgot to add the dhcp.c file to your Makefile or what is
the equivalent in your compiler?
 
Dominik
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