In order to use the widget, you will need to register the device installed to with the WiFi link device, which is detailed in the official LightwaveRF app.
The widget currently only supports four buttons that can be defined to control different devices at installation or afterwards by launching "Lightwave Widget". The buttons by default control Room 1 and devices 1 to 4.
The setting screen also allows configuration of the IP address of your WiFi link device, by default the app will find the broadcast address for the local WiFi network, which should work by default.
Be sure to get in touch with any suggestions for improvements or any issue reports. Tested working on HTC models.