Socket.send(data)

import ws from 'k6/ws';
export default function () {
  var url = 'ws://echo.websocket.org';
  var response = ws.connect(url, null, function (socket) {
    socket.on('open', function () {
      socket.send('my-message');
      socket.send(JSON.stringify({ data: 'hola' }));
    });
  });
}