W5500-Ethernet-Interface Makers
No more update~~ please use W5500Interface.
Fork of
EthernetInterfaceW5500
by 
Bongjun Hur
Correction of a bug in socket::close()
the previous version always call eth->close (_sock_fd) with _sock_fd = -1, so the close was never done on the socket and after 8 requests there was no more socket available (MAX_SOCKET_NUMBER is 8)
Ethernet interface for W5500 with bug fixed in socket::close()
Thx a lot. I also changed code of W5500Interface from your Pull request.