I ran into two issues using it which `qrcp --help` allowed me to get around.

The first was which of the many network interfaces to bind to, `--bind 192.168.0.123`, and the next was to fix a port so I could open a firewall port and not have to change it for the next files `--port 43210`

Don't forget to then open a port on your firewall, `43210` in my example.
