I am confused:"#define PBUF_POOL_BUFSIZE 500" is not the packet size (I can see packet of 1460 bytes from Wireshark), how does it affect the tx buffer?
>>>>>>>>>>>>> By setting PBUF_POOL_SIZE to 16, and with each pbuf at 500 bytes (as specified in your lwipopts.h) you've got a maximum of 7500 bytes of buffering for all the users of pool pbufs.
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