As a refresher; getting the list of connected devices:
https://entronet.fp2.dev/api/devices
Getting a random number:
https://entronet.fp2.dev/api/randint32?deviceId=QWR4A003
Now that this is back up and running (now on a Linux server), I can get back to working on the Android/Java MeterFeeder driver and the Parking Warden graph tool in my spare time.