NetatmoWelcome Error Weather station WS-0 update error: <type 'exceptions.KeyError'>
Doing a bit of digging, I have discovered that it hasn't found the key field last_upgrade. I can't see this in the incoming data having turned on debug.
I have managed to circumvent the issue by putting a bypass in the code around line 1411 of plugin.py. It is now updating the device states correctly.
The only kit I have connected is a Netatmo Weather Station with three internal monitors and one external monitor (in addition to the Base Station) plus a rain gauge. I used to have a wind gauge but that gave up the ghost a long time ago when water got inside it (not fit for purpose IMHO ).
Hope the above info is enough to go on.