It is made for the Arduino UNO WiFi R2 board and is programmed as Server. You must therefore connect to the Arduino via cabled or Wi-Fi network, and not directly to the Arduino. Look at the ...

Arduino UNO WiFi R2 as IoT Server. It is an example of how this microcontroller can be used as an Wi-Fi server. - OJStuff/Arduino-UNO-WiFi-R2-IoT-Server ...