openHab2 on pine64

[tomekr]

in /dev i get 
crw-rw----  1 root dialout 188,   0 Apr 16 17:50 ttyUSB0

but i still get 
COMMUNICATION_ERROR): Serial Error: Port /dev/ttyUSB0 does not exist 
any ideas ?

The user running openHAB needs to be part of the group dialout in order to get access to /dev/ttyUSBX.

I   add user root do dialout group    and chmod a+rw /dev/ttyUSB0 
Now it looks like 
crw-rw-rw-  1 root dialout 188,   0 Apr 16 22:51 ttyUSB0

but nothing happened - still Serial Error: Port /dev/ttyUSB0 does not exist