W5100S Udp LoopBack will stop when receive more bytes

[pengjun]

I am using W5100S in my own board, and use the UDP LoopBack code to run in a STM32F103RC chip.
when send more bytes to w5100s, the loopback_udps(0,ethBuf0,50000) function will be stopped automatically.
but loopback_tcps() is ok.

And I can not find some differences between tcp and udp.

please test in your W5100S-EVB.

[pengjun]

also tcp loop back will response error
i send "01 10 00 0C 00 02 04 0F A0 00 00 F0 CC" every 200ms, but sometimes tcp server do not response the same bytes to me.