String accessKey = "your-access-key-id";
String secretKey = "your-secret-access-key";
String host = "re.iot.gz.baidubce.com"; 
// 如果是北京区域，请用 String host = "re.iot.bj.baidubce.com"; 

 BceClientConfiguration config = new BceClientConfiguration()
                .withCredentials(new DefaultBceCredentials(accessKey, secretKey))
                .withEndpoint(host);
 IotTimerClient client = new IotTimerClient(config);