Each device has it's own url, which is /signage/pusher/app?screenid={nid}
where {nid} is the node id of the device's node. Eg; /signage/pusher/app?screenid=4
This is where the javascript app code is loaded from.
The app code will then load the screen configuration from /signage/pusher/device/{nid} where {nid} is the node id of the device's node.
Eg; /signage/pusher/device/4
