This library allows an Arduino board to connect to the internet using the Arduino Ethernet Shield 2
and Arduino Leonardo Eth
.It can be used either as a server accepting incoming connections or as a client making outgoing ones. The library supports up to four concurrent connection (incoming or outgoing or a combination). Arduino communicates with the shield using the SPI bus. This is on digital pins 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. On both boards, pin 10 is used as SS. On the Mega, the hardware SS pin, 53, is not used to select the W5500, but it must be kept as an output or the SPI interface won't work.
This library is used to work with the new Ethernet shield (version 2) and Leonardo Eth that uses a new Controller W5500.