Implement Ethernet Shield Network Communication

Original : http://www.twbts.work/2019/07/ethernet-shield_4.html

This implementation introduces how to use the Arduino Ethernet Shield W5100 Ethernet expansion board to specify relevant network parameters such as MAC, IP address, etc., and use the WEB SERVER method to make the network expansion board a simple network server.

Ethernet Shield (W5100) is to burn TCP/IP Protocols (TCP, UDP, ICMP, IPv4 ARP, IGMP, PPPoE, Ethernet) directly to the hardware circuit, as long as you use the Ethernet Library, you can easily connect to the Internet . This implementation uses the Arduino Ethernet Shield W5100 Ethernet expansion board from the subsidiary factory, which is compatible with the original Ethernet expansion board and is relatively cheap.