It works remote z-wave stick “online” without using socat!!
Configuration at the system with the z-wave controller connected (/etc/ser2net.conf):
3001:telnet:0:/dev/ttyACM0:115200 8DATABITS NONE 1STOPBIT remctl
and as serial port for the z-wave thing in openHAB I entered (my server is called “meterkast”):
rfc2217://meterkast:3001
Major step for me and many other openHAB users I think who use multiple or remote z-wave controllers!!!
I will test reliability over the next days, thanks again!