[lwip-users] Re: [lwip] UDP socket for writing only.

[Aleksander Wysocki]

>    I open an UDP socket then connect it using "connect" function - give
the
> lwIP information about server's address. And after all of that I use only
> "send" function to send information I need.
>    Now imagine that there are incoming datagrams addressed to this socket.
> My program doesn't get them because it doesn't call "recv" function. As I
> understand after some period of time incoming datagrams take all free
pbufs
> for the incoming datagrams and other sockets will not be able to receive
> data.
>    Is there any mechanism in the lwIP to avoid these situations?
>    What is wrong in this entire scenario?

if you do not call recv(), incoming datagrams will be just discarded.
(maybe some amount (for example one - it depends of the implementation)
will be hold in hope you will recv them, but for sure they will not eat up
your memory)

it is udp - if you want to receive you must "listen" for them.
in general - if client isn't able to receive udp datagram it is discarded.

O.


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