Re: [lwip-users] pinging

[Jonathan Larmour]

Jonathan Larmour wrote:
> Marcin Prusinski wrote:
> > Hey !
> > I was looking for example that will help me send some icmp echo 
> > requests. I only found post of Larry Piggins who wrote exactly 
> > something i need, but i couldn't find the code.
>
> You need to make a raw socket, i.e. NETCONN_RAW, ensuring LWIP_RAW is on 
> in your configuration.
>
> > I'm using standalone version of LWIP.
> > I'm just a begginer and I can't figure out how to compute ICMP ECHO 
> > checksum.
>
> Here's some code obtained from elsewhere:
[snip]

Actually, you could also directly use lwip's own checksumming routines if 
you like. If you #include "lwip/inet.h" you can get this function from there:
u16_t inet_chksum(void *dataptr, u16_t len);

Jifl
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