I am trying to pre-programme an Arduino UNO with Ethernet Shield for a light-footswitch. It has several switches, a display and is connected OFFLINE to a PC on which a lighting programme is installed (DASlight). By pressing on one of the buttons, a single character (char) shall be sent to the PC in order to trigger the light-programme.
So, how do I set up the ethernet connection correctly for using an offline-connection between Arduino UNO and a PC to send single characters?
Unfortunately, I am not creating the physical connections, I am "just" doing the programming and I was wondering, how I should set up the ethernet connection. Since both the Arduino AND the PC will not be connected to the Internet, I don't know, which addresses I need to put into the Arduino. Or do I actually need to put this kind of information when there is no internet connection, at all?