Xcel Energy ITron Gen 5 Riva API documentation

The original thread is already pretty long so I didn’t want to add to confusion but has anyone found any documentation or other information on the Riva Gen 5 API? Is there any other useful information that can be pulled from the device?
Xcel Energy ITron Gen 5 Riva (Original Thread)

These are the two URLs being used to poll instantaneous and total power use. I’ve played with a few others that output data, but I can’t make sense out of any of it.
https:||{deviceip}:8081/upt/1/mr/3/r ← Total Energy
https:||{deviceip}:8081/upt/1/mr/1/r ← Current Load