[lwip-users] To peak before read?

[Chen]

With TCP connection, lwip_recv waits until it receives data.
I'd like to take a look at the input buffer before getting it so that I
can do something else while waiting for more data? I tried setting the
flag in recv to 1 (peek) or 9 (peek & nowait), but it doesn't do what
I expect

Thanks for any suggestion!