In my previous post I was using the Arduino Ethernetshield to connect my Arduino to a Java Server running on my local machine. Now I’m Using the Arduino as a TCP Server and my local machine as a Client. So it’s just the other way around I modified the Arduino Webserver example to a simple TCP Server:#include <SPI.h> #include <Ethernet.h> // Enter a MAC address, IP address and Portnumber for your