easywechat6.x怎么回复用户消息？

    public function serve(Request $request){
        $config = config('socialite.wechat');
        $app = new Application($config);
        $symfony_request = new SymfonyRequest($request->get(), $request->post(), [], $request->cookie(), [], [], $request->rawBody());
        $symfony_request->headers = new HeaderBag($request->header());
        $app->setRequestFromSymfonyRequest($symfony_request);//必须替换服务端请求
        $server = $app->getServer();

        $server->addMessageListener('text', function($message) {
            return 'hello';
        });

        $response = $server->serve();
        return response($response->getBody()->getContents());
    }