Today I have update my NR on my pi3B+ from 0.20.7 to 1.0.3.
At the same time I have update some nodes among which the serial port node from version unknown to 0.10.0.
Since that moment my comport is giving an error in the debug window
serial port /dev/ttyUSB0 closed unexpectedly
I removed the node and reinstalled it, but still not working.
Any suggestion what could be the problem or can I install an older version of the serial port node?
Opening the port on the command line with
minicom -b 115200 -o -D /dev/ttyUSB0 will show me the data from my smart meter, so it doesn't look like a hw or os problem