ios - 如何启用自定义 CBDescriptor 值？

我正在开发 BLE 应用程序(与 Heath 相关)，我有一个选项可以从 BLE 设备获取 ECG 值。我需要启用 8 个波形才能在我的应用程序中获取 ECG 数据。

我的问题是如何使用 CBDescriptor 启用所有波形。我需要将如下数据传递给 CBDescriptor。 波形 ID 格式 0:8bit，1:16bit，2:32bit，3:64bit，4:128bit，5:8bit*3，6:16bit*3，7:32bit*3

 uint8_t waveArray[8] = {0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00};
 NSData *waveData = [NSData dataWithBytes:waveArray length:sizeof(waveArray)/sizeof(uint8_t)];
[peripheral writeValue:waveData forDescriptor:descript];

但我没有得到设备的任何响应。请帮帮我。

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Best Answer-推荐答案

最后我得到了我的问题的解决方案。首先我们需要调用 CBDescriptor 的 discover 方法。

[peripheral discoverDescriptorsForCharacteristic:characteristic];
-(void)peripheralCBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristicCBCharacteristic *)characteristic  errorNSError *)error {
 NSArray *Descroptors = [characteristic descriptors];
 CBDescriptor *descript;
 [peripheral setNotifyValue:YES forCharacteristic:characteristic];

for (descript in Descroptors)
{
    if ([descript.UUID isEqual:[CBUUID UUIDWithString:KT_WP_WC_CHARACTERISTIC]])
     {
         uint8_t waveArray[9] = {0x02,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00};//Your data which you need to send to BLE device
         NSData *waveData = [NSData dataWithBytes:waveArray length:sizeof(waveArray)/sizeof(uint8_t)];
         [peripheral writeValue:waveData forDescriptor:descript];
          NSLog(@"waveData ==%@",waveData);           
          CBUUID * sCBUUID = [CBUUID UUIDWithString:KT_WP_SERVICE];
          CBUUID * cCBUUID = [CBUUID UUIDWithString:KT_WP_WF_CHARACTERISTIC];
          [self CBUUIDwriteValue:sCBUUID characteristicUUID:cCBUUID p:peripheral data:waveData];
       }else
       {            
          const unsigned char bytes[] = { 0x28, 0x00 };//Your data which you need to send BLE device
          NSData *descriptorData = [NSData dataWithBytes:bytes length:2];            
          CBUUID * sCBUUID = [CBUUID UUIDWithString:KT_WP_SERVICE];
          CBUUID * cCBUUID = [CBUUID UUIDWithString:KT_WP_WF_CHARACTERISTIC];
           [self CBUUIDwriteValue:sCBUUID characteristicUUID:cCBUUID p:peripheral data:descriptorData];   
        }
  }

}

关于ios - 如何启用自定义 CBDescriptor 值？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46617943/