Based on https://github.com/shanet/WebRTC-Example, see https://shanetully.com/2014/09/a-dead-simple-webrtc-example/ for a description of WebRTC basics.
The signaling server uses Node.js and ws and can be started as
follows:
$ npm install
$ npm start
With the server running, open Chrome and go to to https://[server] from any client on the LAN.
Optionally, use a URL parameter to specify the client display name, e.g. https://[server]/?displayName=Boston
You may have conflicting tasks already using the default HTTP and/or HTTPS ports (80 and 443), which will result in an error on startup. Change the constants in server.js and go to https://localhost:[HTTPS_PORT]
For production, the server can be deployed as a Windows service using node-windows, which can be installed as follows:
npm install -g node-windows
node install_service.js