Using the Dockerfile

Building the image

$ docker build -t simreprap .

Building and running the code

$ docker run --rm -v $PWD:/simreprap -p 3000:3000 -i -t simreprap

Accessing the simulated serial port

$ telnet $(boot2docker ip) 3000
Trying 192.168.59.103...
Connected to 192.168.59.103.
Escape character is '^]'.
start
echo:Marlin 1.0.0
...

This assumes boot2docker, you can just use localhost if running on the Docker host. Also, feel free to replace telnet with nc.

Exposing the simulated serial port as a virtual port on the host

$ socat pty,link=/tmp/simreprap tcp:$(boot2docker ip):3000

Then direct e.g. Pronterface to connect to the "port" at /tmp/simreprap.