Re: [lwip-users] recv callback function for sockets?

[Simon Goldschmidt]

I know it sounds repellent, but get a good book on sockets programming and read 
about the function 'select()'.

Simon


> Hi,
> 
> I am using lwIP in context with FreeRTOS and try to write a NTP client. I
> have a task which is called fix every 1000 ms. In the task loop I either
> send out a UDP request to a NTP server or poll recvfrom() for received UDP
> replies. For communication I am using the socket API.
> 
> My problem is that I should process the received packets immediately.
> Polling recvfrom() every second is too slow. I am wondering if it's
> possible
> to register a callback function which will be called as soon a packet was
> received -> similar to udp_recv(). How would I have to use it with
> sockets??
> 
> Thanks for helping! Best regards,
> Mathias
> 
> 
> Additional information:
> 
> - My socket is non-blocking: lwip_ioctl(fd, FIONBIO, &noblock_true);
> - Sending out my request datagram works fine: sendto(fd, &snd_buffer,
> sizeof(snd_buffer), 0, (struct sockaddr *)&addr, addr_length);
> - Reception basically works fine too: recvfrom(fd, &rec_buffer,
> sizeof(rec_buffer), 0, (struct sockaddr *)&addr, &addr_length);
> 
> 
> 
> 
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