connect method
Implementation
void connect() {
webSocketChannel = IOWebSocketChannel.connect(url, protocols: protocols);
// this?.onOpen();
webSocketChannel.stream.listen((message) {
this.onMessage(message);
}, onError: (error) {
this.onError(100, error);
}, onDone: () {
this.onClose(0, "Websocket closed.");
});
}