In this example, you will use your Ethernet Shield and your Arduino to send and receive text strings via the UDP protocol (Universal Datagram Packet). You’ll need another device to send to and from. The Processingsketch included at the end of the code will send to and receive from your Arduino running this example.
Step 1: What You Need?
Step 2: Build Your Circuit.
Dated : Friday, August 05, 2016
Source : https://myrobotduino.blogspot.kr/2016/08/sending-and-receiving-string-via-udp.html
Author : Robot edu