ios - 如何启用自定义 CBDescriptor 值？

Question

我正在开发 BLE 应用程序(Heath 相关)，因为我有一个选项可以从 BLE 设备获取 ECG 值。因为我需要启用 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的格式 0:8位、1:16位、2:32位、3:64位、4:128位、5:8位*3、6:16位*3、7:32位*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];

但我没有收到设备的任何响应。请帮助我。

Answer 1

终于我的问题得到了解决。首先我们需要调用 CBDescriptor 的 discovery 方法。

[peripheral discoverDescriptorsForCharacteristic:characteristic];
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic  error:(NSError *)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];   
        }
  }

}