kennel/static/index.js

window.onload = () => {
  const ws = new WebSocket("/ws");
  ws.onopen = () => {
    console.log("connected");
  };
  ws.onmessage = (e) => {
    console.log(e);
  };
  ws.onclose = (e) => {
    console.log("disconnected", e);
  };
};