I have just found the references to the comments about removal of a functionality that I have misread to mean removal of support for RFC2217 in the ZWave binding: [SOLVED] [Zwave, Zigbee, ...] RFC2217 remote serial port HowTo? - #4 by chris
I stand corrected by @chris that the functionality is present in the current ZWave binding, albeit no one has reported it as working, while there are 3 of us, @dastrix80, @vossivossi (who got a bit further that I and could see something in the logs) and I, at least, reporting it as not functioning.
Just found also this comment by @curlyel “For the Zwave I have to stick with the socat stuff anyway due to the reverted implementation. Thanks Chris for pointing this out!”. Based on the comments from @chris I assume this must be factually incorrect as there was no reverted implementation of the RFC2217 support. I hope I am getting this right!