Re: [lwip-users] PPP

[Frédéric BERNON]

> Dear All,
>    Our project team is trying to send data using point to point 
> protocol,We
> are using PPP 2.4 version with LWIP.We are able to establish a PPP link 
> and
> got IP address from ISP using our own drivers.After this we have the
> following issues.

To be sure to understand, do you use the ppp stack provided with lwIP 
sources, or your own one? What lwIP release do you use?

> 1.We are unable to pass the  IP packets ,since there are more files such 
> as
> tcp.c,ip.c,tcpip.c,udp.c..etc.Through which file we have to send data that
> is IP packets.

I will suppose you have implement your own PPP. So, if you use sockets API, 
you should send them to the tcpip_input function (sockets API and netconn 
API use the same entry point)

> 2.We decided to use sockets to send packets,but it does not returns a 
> socket
> id like  windows socket API.

lwip_socket/socket return an "int", this one is valid is it's >=0. Windows 
socket API return a SOCKET type, which is also an "int"

> 3.we are confused to decide a code flow   to send tcp/ip packets. also in 
> a
> file called ip.c the function  ip_init is empty but defined, a comment is
> mentioned inside the function   "/* no initializations as of yet */".
>
> kindly reply us to find a correct path.

The CVS head is now more simple for init. The best if you know Windows is to 
look the lwip/contrib/ports/msvc6 port which is updated for initialization 
parts.
Once initialized, you can use sockets API like on any systems.

You can also found some informations on :

http://lwip.scribblewiki.com/LwIP_Main_Page

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