IOS蓝牙BLE writevalue返回＆QUOT;未知错误＆QUOT;

我的深化发展我的第一个智能蓝牙（BLE）软件上的IOS 6。

I am developping my first Smart Bluetooth (BLE) software on IOS 6.

我能够接收通知和阅读chracteristics值用的北欧开发套件包括从自定义配置文件关贸总协定我创造（与服务和特点的具体的UUID）。

I am able to receive notifications and read chracteristics values exchanged with a Nordic Development kit including from a custom GATT profile I have created (with specific UUIDs for service and characteristics).

不过，每次我试图在一座独具特色的写值，我得到错误信息未知错误没有更多的信息。没有错误code，没有 CoreBluetooth【警告】根据X code。

But, everytime I am trying to write a value in a characteristic, I get the error message Unknown Error without more information. No error code, no CoreBluetooth[WARNING] from XCode.

我已经设置我的服务和特征属性的权限，而不验证来写。使用开发工具北欧，我能够在我的特点来写一个值，所以它不会是一个权限问题。

I have set my service and characteristics attributes permissions to write without authentication. Using a development Nordic tool, I am able to write a value in my characteristic, so it would not be a permission problem.

下面是code，我用写值

Here is the code I am using to write the value

uint16_t val = 2;
NSData * valData = [NSData dataWithBytes:(void*)&val length:sizeof(val)];
[testPeripheral writeValue:valData forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

和那里的错误未知错误惜售回调

And the callback where the error "Unknown error" is rised

 - (void) peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:
                     (CBCharacteristic *)characteristic error:(NSError *)error
{   
    NSLog(@"Did write characteristic value : %@ with ID %@", characteristic.value, characteristic.UUID);
    NSLog(@"With error: %@", [error localizedDescription]);

    //code...
}

在控制台中的错误文本是

The error text in the console is

Did write characteristic value : <068c0e00 fedc070c 050b3200 04> with ID Unknown (<4444>)
With error: Unknown error.

在错误信息的价值是不是我想写?? !! 444是我使用了我的测试中正确的UUID。

The value in the error message is not what I am trying to write??!! 444 is the correct UUID I am using for my tests.

是值的长度来写重要？

在互联网上寻找hoirs和尝试了很多测试之后，我需要这么弄明白。
有什么建议？

After looking hoirs on the internet and tried a lot tests, I need SO to figure it out. Any advice?