websocket-reconnect.js

function connect() {
    const URL = 'wss://localhost:8080';
    const RECONNECT_DELAY = 1000;
    const WAIT_FOR_NO_MESSAGE = 30000;
    const handler = null;
    var ws = new WebSocket(URL);

    ws.onmessage = function(e) {
      clearTimeout(handler);
      setTimeout(() => ws.close(), WAIT_FOR_NO_MESSAGE);
      console.log('Message:', e.data);
    };
  
    ws.onclose = function(e) {
      console.log(`Socket is closed. Reconnect will be attempted in ${RECONNECT_DELAY / 1000 | 0} second.`, e.reason);
      ws = null;
      setTimeout(function() {
        connect();
      }, RECONNECT_DELAY);
    };
  
    ws.onerror = function(err) {
      console.error('Socket encountered error: ', err.message, 'Closing socket');
      ws.close();
    };
  }
  
  connect();