The biggest issue was the WLL, took several days to figure out why CMX wouldn't have any data to display. Davis WeatherLink site shows connectivity etc, I knew it had to be a CMX setting that I had wrong and I finally found it
Anyway, just stumbled upon a blog about Debian Buster upgrade to "Bullseye". Well followed the guide I had stumbled upon, that is very straight forward, cut and pasted and reboot and viola CMX working and no issues so far (2 hours).
