Well, the story is a bit more complicated, but at the moment all reading are zero forever.
It took a few failed attempts to upgrade the firmware, it would always restart after about 60% using the CD tool, same when using the browser, but after a few attempts it went to 100% and everything seemed OK.
After watching it for half a day, I noticed that one MTU (solar) does not send any data.
Decided to start over from scratch. I cleared everything, including history and settings, and re-uploaded the firmware. Now the firmware upgrade proceeded without problems (both files). Then I restored my settings and utility backup.
Everything looks right, including the MTU IDs, etc.
That was last night.
This morning, the footprint readings were still all zero, even though a significant amount of packets were received according to the stats page. Powercycling the gateway did not help. Later, I went into the panel and cycled the MTUs.
This did not help either.
Physically, everything looks normal. The MTUs are flashing at the typical rate. The LED on the side of the gateway flashes also at a regular rate.
However, all footprint readings are zero and the stats page is all zeroes for "MTU Rec." and "MTU skp". "LP sample" is at 2147483647 for both MTUs. Uptime right now is ~12000 seconds, MTU IDs are correct.
Note that my hardware setup worked reliably for a very long time. I also have a filter installed. Nothing changed except the firmware upgrade.
Any ideas on how to troubleshoot further? I can give the remote access URL via PM if needed (I don't want it public).