Wake-on-LAN adapter for the Mozilla WebThings Gateway.
Normally you will just want to install this from the add-ons list provided by the gateway.
To configure the add-on, i.e. add the devices you'd like to control, navigate to Settings -> Add-ons in the gateway's UI and click the Configure button for the Wake-on-LAN add-on.
You'll then add the MAC addresses you'd like to control and click Apply.
After this, your devices should appear when you click the button to add new things on the home screen.