I’ve not followed the whole thread here so apologies if I’m telling you what you already know…
It seems that you’re focussing on the port not opening. What I don’t see anywhere is anything from the logs that show what errors you’re getting - just that you’re not seeing anything in HABmin. If the port isn’t being opened, then you’ll get an error in the log - you should check there. You should also run the logging in DEBUG mode - at least until things are up and running - logging is really your best friend here 
You also seem to be unsure about the port name? to find the port name, simply type ls /dev/tty* - do this with and without the stick plugged in and see what changes.