iPhone 5C/5S 上的 CoreBluetooth：收到的数据损坏

Question

我在 iPhone 5C 和 iPhone 5S 上使用 CoreBluetooth 时遇到了一个奇怪的问题。 根据场景，我将接收 83 个字节的数据，按 20 个字节分块（共有 5 个块）。 iPhone 5S/5C 上的数据不同（请参阅下面的转储）：在这些设备下，块 #4 替换了块 #3。 但在 iPad3（带有 6.1 和 7.0.2 iOS）上一切正常

// iPhone 5C, iOS 7.0.2
nRF UART[237:60b] Received data on a characteristic. 0x01=001,0x02=5B2226
nRF UART[237:60b] Received data on a characteristic. 400192,0x05=1.0.0,0x
nRF UART[237:60b] Received data on a characteristic. ,0x09=2,0x0a=0,0x0b=
nRF UART[237:60b] Received data on a characteristic. ,0x09=2,0x0a=0,0x0b=
nRF UART[237:60b] Received data on a characteristic. 100ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ

// iPad 3, iOS 6.1.3 && iPad 3, iOS 7.0.2
nRF UART[221:60b] Received data on a characteristic. 0x01=001,0x02=5B2226
nRF UART[221:60b] Received data on a characteristic. 400192,0x05=1.0.0,0x
nRF UART[221:60b] Received data on a characteristic. 07=2013.010,0x08=001
nRF UART[221:60b] Received data on a characteristic. ,0x09=2,0x0a=0,0x0b=
nRF UART[221:60b] Received data on a characteristic. 100ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ

// iPhone 4S, iOS 6.1.3
nRF UART[241:60b] Received data on a characteristic. 0x01=001,0x02=5B2226
nRF UART[241:60b] Received data on a characteristic. 400192,0x05=1.0.0,0x
nRF UART[241:60b] Received data on a characteristic. 07=2013.010,0x08=001
nRF UART[241:60b] Received data on a characteristic. ,0x09=2,0x0a=0,0x0b=
nRF UART[241:60b] Received data on a characteristic. 100ˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ

我的问题是：如何从 5S/5C 设备中获取正常数据？或许，CBCharacteristic 或 CBCentralManager 有一些技巧？

谢谢。

编辑

正如 @allprog 所建议的，这里是我如何使用 CoreBluetooth 的代码片段。

这是非常基本的方法：

// CBCentralManager init
self.cm = [[CBCentralManager alloc] initWithDelegate:self queue:nil];

// Getting data chunks from CBCharacteristic in CBPeripheral's Delegate
- (void) peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    {
        if (error)
        {
            NSLog(@"Error receiving notification for characteristic %@: %@", characteristic, error);
    return;
        }

        NSLog(@"Received data on a characteristic. %s", [[characteristic value] bytes]);
        // ... the rest of code
}

Answer 1

如果您要传输大量数据并且必须将其拆分为多个数据包，我建议您为每个数据包添加某种 ID。这将为您提供接收方所需的附加信息，以确定数据包是否被丢弃、接收两次等。如果您检测到数据包被丢弃，您可能需要一种通过 ID 重新请求数据包的方法外围设备。

编辑：另外，如 cmets 中所述，您可以切换到指示，让蓝牙堆栈满足您对保证和非重复交付的需求。