Re: [lwip-users] DHCP

[address@hidden]

> You can get the IP address, Netmask and Gateway from the netif you're using
> for the interface: e.g. netif->ip_addr
>   
With this, you are relying on lwIP-internal data structures! While this 
surely works, it is strongly discouraged by the lwIP developers: The 
internals data structures are never guaranteed to be portable accross 
versions so you risk your code being valid for a specific version of 
lwIP only!

I'm aware this is a problem here, though: there is no function (or 
macro) netif_get_addr corresponding to your code, which is why Jonathan 
suggested using nectonn_addr, which leads to the same result if you have 
one netif only.
> If( ( netif->flags & (NETIF_FLAG_UP | NETIF_FLAG_LINK_UP) ) !=
> (NETIF_FLAG_UP | NETIF_FLAG_LINK_UP) )
>         Check_timer - if expired do something.
>   
Same as above: please don't use the internal structs and its flag 
definitions when the same can be done differently since you risk using 
portablilty over lwIP versions:

Since 1.3.0 (which was when NETIF_FALG_LINK_UP was introduced), you can 
set callback functions to be called when the netif status changes, which 
event eliminates the use of a timer suggested by bill: 
netif_set_status_callback.

Simon