To install required packages start by running:

Start websocket server with:

npm run start
#runs on port 3000
#or
$env:PORT=8888 npm run start
#will set the port to 8888

You could have an issue with CORS if you don't run the storyline app and this server from the same domain (eg. http://localhost:3000)

To solve this issue you need to serve the articulate html with a http-server.

run

in the storyline directory. This should serve the html at http://localhost:8080/story.html You need to point the socket.io client at the socket.io server (runs on PORT 3000 by default)

something like

const socket = io('http://localhost:3000)

This server will send a socket event every 1.5 seconds containing an event identifier call 'switchSlide' and a random number between 1-3.