websocket-client.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Prueba WebSocket</title>
</head>
<body>
    <button id="start">Send Request</button>
    <p id="result">Response: </p>
</body>
<script>
    const socket = new WebSocket("ws://localhost:8887");
    const result = document.getElementById("result");
    const start = document.getElementById("start");
    socket.binaryType="arraybuffer";

    start.addEventListener("click", connectWebsocket, false);
    
    function connectWebsocket(ev){
        socket.send("getInformationDevice");
    }

    socket.onclose = (ev)=>{
        result.innerHTML += "<br> Connection Closed!";
    }

    socket.onmessage = (ev)=>{
        result.innerHTML += "<br>" + ev.data;
    }

    socket.onopen = (ev)=>{
        result.innerHTML += "<br> Conected!";
    }

</script>
</html>