If you’re trying to run ozwcp, why not just create a service for it and run it 24/7? That way, you can just stop the zwave network inside of hass, open your browser to the ozwcp page, connect, do you thing, disconnect, and then start the zwave network back up in hass?
When you say stop the zwave network inside of hass, do you mean stopping the home assistant service?
I assume once that is done, they you will be able to reach http://ipaddress:8090? Lastly, how did you determine the port, is it defined somewhere? Or is it just the default port? I ask because when you manually start the OZWP:
sudo ./ozwcp -p 8888
You specify the port you want to use with the 8888.