调用一次GatewayClient向客户端发送数据，结果总是收到两次数据

require_once './GatewayClient/Gateway.php';
use GatewayClient\Gateway;

Gateway::$registerAddress = '172.18.117.95:1238';
$client_id=$_GET;
$arr=array(
  'box'=>$_GET,
  'oid'=>$_GET,
);
$data=json_encode($arr);

Gateway::sendToClient($client_id, $data);