It uses SocketIO for websocket communication on port 3030.

There are two clients: posnet and https://localhost:3030 that connect to the websocket server at ws:https://localhost:3030

You need yarn and npm for this to work.

To start the server:
cd server/
npm start

To start the client:

cd posenet
chmod a+x quickstart.sh
./quickstart.sh

cd posenet
yarn
yarn build && yarn yalc publish
cd demos
yarn
yarn yalc link @tensorflow-models/posenet
yarn watch

To update the client:
cd posenet/demos/
chmod a+x build.sh
./build.sh

(On MacOS, make sure in Xcode, Preferences -> Locations, that Command Line Tools is valid)