ser2net can be used to forward /dev/ttyUSBx or /dev/ttySx to a tcp port.
One can then use telnet for connecting.

The config has to be done in /etc/ser2net.conf

This is an example:
3333:telnet:0:/dev/ttyUSB1:9600 8DATABITS NONE 1STOPBIT

Here ttyUSB1 with the named options is forwarded to telnet port 3333 on the local machine.

You then need to start "/sbin/ser2net"
You can stop it by "sudo service ser2net stop"

This is realized on atpnuc006 now.