Application allows you to share USB device over network. Depending on device type you can compare it to printserver. Notice that it won't work with regular desktop printers.
At first you need to select USB device and communication interface. To ease correct choice you can use "Send test" button.
During test ESC/POS, random data and test page data are being sent.
After selecting proper device, it gets available in network at IP address and default port 9100.
When confirming communication with device it's recommended to select option "use by default for this USB device" to avoid constant security prompts.