[lwip-users] How to find out if I can send out more UDP packets?

[Xun Chen]

Hi there,

I use udp_sendto to output packets, if I space them in time to make sure 
the packets are sent, everything is fine, but if I call udp_sendto too 
frequently, I will run into error code -1, out of memory.

Which lwip raw API can I call to find out if I have the resource before 
I construct the UDP payload?

Thanks!

XC