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Description
The return value of EthernetClient::write should be the return value of Ethernet::socketSend:
Ethernet/src/EthernetClient.cpp
Line 86 in 75a3c37
Otherwise if the buffer to be sent is larger than W5100.SSIZE it will only send W5100.SSIZE number of characters,
https://github.com/arduino-libraries/Ethernet/blob/master/src/socket.cpp#L428
yet EthernetClient::write still returns 'size'.
A better way to implement EthernetClient::write is to add a loop until the whole content is sent.