To get the desktop app to work over a wired network connection is fiddly but doable.
First you have to set the PSU up as per the limited instructions using the mobile app. Be warned its buggy...
It looks like the PSU sets up a hidden WiFi access point. You configure the mobile app with your network name and password of your router and then let it connect to the PSU to pass the login information. You must have location services switched on or the app will crash on an iOS device
the IP address which the app uses is the IP address of the device you are working from. The PSU seems to uses this IP address to make a connection "to" the application
Once the information has been passed, it looks like the PSU then sets up a connection to your router and waits for the App to connect to it (No idea why it needs IP address of your mobile device)
The mobile device should now connect and work nicely.
Now, if you want your desktop application to connect to the PSU, switch off your mobile device and change the IP address of your desktop to that which the mobile device was using before you switched it off and hey presto, the desktop app now connects to the PSU using the wired network connection.
If anyone from RIDEN is reading this, PLEEEEEASE look at this and change the setup to allow easy connection from a wired desktop device!!!
And please, if anyone knows another way, please share
Dave