ios – 核心蓝牙 – 中心无法写入外设

我希望在外围设备中具有可写特性,中央将少量字节写入(大约4个字节但可能因执行而异).

我正在配置外设如下：

-(void)startPeripheral
{
    CBMutableService *service = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:kMyServiceUUID] primary:YES];
    CBMutableCharacteristic *ch = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:kMyWriteUUID] properties:CBCharacteristicPropertyWrite value:nil permissions:CBAttributePermissionsWriteable];
    service.characteristics = @[ch];

    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@[[CBUUID UUIDWithString:kMyServiceUUID]],CBAdvertisementDataServiceUUIDsKey,@"My Peripheral",CBAdvertisementDataLocalNameKey,nil];

    [self.peripheralManager addService:service];
    [self.peripheralManager startAdvertising:dict];

    NSLog(@"Service = %@",service);
}

这一切似乎都起作用,外围设备宣传服务,我的中心可以扫描,查找,发现服务和特性,并找到它感兴趣的特性.当我尝试写入特性时出现问题.

在中央我有以下方法：

-(void)peripheral:(CBPeripheral *)peripheral diddiscovercharacteristicsForService:(CBService *)service error:(NSError *)error
{
    NSLog(@"Service/characteristics = %@",service.characteristics);
    for(CBCharacteristic *ch in service.characteristics)
    {
        NSLog(@"Characteristic properties = %x",ch.properties);
        NSLog(@"Characterisctic = %@",ch.UUID);
        if([ch.UUID isEqual:[CBUUID UUIDWithString:kMyWriteUUID]])
        {
            // We've found our write characteristic
            NSLog(@"Writing data to characteristic %@",ch.UUID);
            NSData *data = [NSData dataWithBytes:(Byte[]){1,2,3,4} length:4];
            [peripheral writeValue:data forCharacteristic:ch type:CBCharacteristicWriteWithResponse];
        }
    }
 }

我得到一个回调didWriteValueForCharacteristic,它指示错误：

错误域= CBATTErrorDomain代码= 14“不太可能出错.”

哪个不是很有帮助.

有人能发现并发布或建议任何解决方案吗？

谢谢,Rich