蓝牙写数据权限问题
根据蓝牙writeCharacteristic.properties判断，CBCharacteristicWriteWithoutResponse还是CBCharacteristicWriteWithResponse
[_peripheral writeValue:data forCharacteristic:_writeCharacteristic type:CBCharacteristicWriteWithoutResponse];
[_peripheral writeValue:data forCharacteristic:_writeCharacteristic type:CBCharacteristicWriteWithResponse];
CBCharacteristicWriteWithResponse会响应CBPeripheral的代理方法
/*!
* @method peripheral:didUpdateValueForCharacteristic:error:
*
* @param peripheral The peripheral providing this information.
* @param characteristic A <code>CBCharacteristic</code> object.
* @param error If an error occurred, the cause of the failure.
*
* @discussion This method is invoked after a @link readValueForCharacteristic: @/link call, or upon receipt of a notification/indication.
*/
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error;