workerman frame协议问题

Question

require_once __DIR__ . '/vendor/autoload.php';
use Workerman\Worker;
use Workerman\Lib\Timer;

$f_worker = new Worker('frame://0.0.0.0:1223');


$f_worker->onConnect = function ($connection){
echo "connection success\n";
};
$f_worker->onWorkerStart = function($tw){

};
$f_worker->onMessage = function($connection, $data){
var_dump($data);
$connection->send($data);
};

Worker::runAll();

这段代码，启动 php run.php start，正常
但是telnet 127.0.0.1 1223
然后输入
就会报错

请问大家遇到这样的问题了吗？
怎么解决呢？