Anyway: Back to the main questions from above:
Answer: At least partly not (yet?). For the Zwave I have to stick with the socat stuff anyway due to the reverted implementation. Thanks Chris for pointing this out!
Remain open:
Would still appreciate to see some working setup as an example.
But:
I guess I should skip rfc2217 for now.
Thanks guys, I think you saved me a lot of spare time 
+1