This project is basic and tutorial for the beginner with Ethernet shield or who wants to alternative from wifi. Please refer the open code and enjoy it!
In the network, the most important part is the network setting. It could be software and hardware. Makers must consider the IP address and the Network configuration. If you are in trouble the connection or transit data with perfect code, double check the network, LAN cable, link led, IP collision, MAC collision, Ping test, …
It is Web Server example code. The code has no hard part and only considering the IP address and network setting.