I have an installation with a quattro and a PI with venus os.
My dashboard shows “This site has stopped reporting to VRM. Check the internet connection to the GX device.”
and the grid consumption is not displayed (–). Battery status and dc system, however, are current and valid values, updated every few seconds, also it says “real time”.
The other day I even did a remote reconfig of the quattro, which alsow worked flawlessly.
I don’t know what the answer is. But I have noticed on mine that when I have the error, it says “real time” but no values actually update. In your case, you say some values actually update which is a head scratcher.