Good to know about the Pi. I don’t have a display or keyboard connected to mine, it’s telnet-only. And I have four modems. That’s why our own Johnson’s firmware for the ZyXEL modems is so helpful to me; only need a web browser. I’ve written a lot of tools in iOS Shortcuts for the iPad which make use of Johnson protocol and this latest one, an overall state summary report, is just the latest.
If you had to put an ES per hour figure into one of several categories, say, approximately
1. no errors, zero
2. low error count that is non-zero
3. problem error count, and maybe also
4. severe problem error count
what might those numbers be for your line, and how many /which of those categories do you think might be useful? Probably too many?