Sorry but I don't understand what you mean, in terms of connectivity there is no difference between UTP cable and wireless connection, either way you would access your arduino device through an IP address in your local network.
The article is about serial connection through a USB cable, not wireless, but even if you are using a network connection, the specific way of retrieving the data is going to depend on the kind of output is producing.
For example I get data from a wireless microcontroller programed with arduino, by setting a web server in the microcontroller that produces JSON output, and then reading the JSON data on R from a URL address.