IOS:Write command values to corebluetooth peripheral device 获取响应

Question

开发 corebluetooth 应用程序并在与外围设备通信等几个方面感到困惑。为了从中检索信息，我对编写要观看的命令感到困惑。请在下面找到我的代码

  int sendcommand[6];
  sendcommand[0]=0x01;
  sendcommand[1]=6;
  sendcommand[2]=0x70;
  sendcommand[3]=0x00;
  sendcommand[4]=crcData[0];// value is -100
  sendcommand[5]=crcData[1];// value is -31

  NSMutableArray *arr=[[NSMutableArray  alloc]initWithCapacity:6];
  for (int i = 0; i < 6; i++) {
    NSNumber *number = [NSNumber numberWithFloat:sendcommand[i]];
    [arr addObject:number];
   }
   NSLog(@"mutable arr is %@",arr);

  NSString *error1;
   NSData *dataarr = [NSPropertyListSerialization dataFromPropertyList:arr    
   format:NSPropertyListBinaryFormat_v1_0 errorDescription:&error1];


CBMutableCharacteristic *testCharacteristic = [[CBMutableCharacteristic alloc]  
initWithType:characteristicUUID 
properties:CBCharacteristicPropertyRead|CBCharacteristicPropertyWrite value:dataarr 
 permissions:CBAttributePermissionsReadable|CBAttributePermissionsWriteable];
NSLog(@"Read or Write %@ ",testCharacteristic);

[peripheral writeValue:dataarr forCharacteristic:testCharacteristic 
type:CBCharacteristicWriteWithoutResponse];

我的问题是通过使用以上六个命令创建一个打包器并将数据发送到外围设备并作为响应它通过更新值返回一些信息。我将控制台值获取为

  2014-12-19 19:26:51.068 Bluetooth_iph[1267:180180]    

   didUpdateNotificationStateForCharacteristic
   2014-12-19 19:26:51.069 Bluetooth_iph[1267:180180] characteristic.UUID : 8881
   2014-12-19 19:26:51.069 Bluetooth_iph[1267:180180] characteristic.value : (null)
   2014-12-19 19:26:51.069 Bluetooth_iph[1267:180180]    
    didUpdateNotificationStateForCharacteristic
    2014-12-19 19:26:51.070 Bluetooth_iph[1267:180180] characteristic.UUID : 8882
    2014-12-19 19:26:51.070 Bluetooth_iph[1267:180180] characteristic.value : (null)

请帮助我为上述命令创建数据包，以获取蓝色外设的响应。

Answer 1

您不应手动创建 CBCharacteristics。您应该使用 CBCentralManager 在方法中返回的那些:

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error

您可以从以下位置访问特征:

service.characteristics