connect() {

            this.socket = new WebSocket(this.url + ":" + this.port);

            this.socket.binaryType = "arraybuffer";

            this.socket.onopen = this.onOpen.bind(this);

            this.socket.onmessage = this.onMessage.bind(this);

            this.socket.onclose = this.onClose.bind(this);

            this.socket.onerror = this.onError.bind(this);

    }

onOpen(event) {

        console.error(event); //event is undefined

    }