问题
I decided to build a tool to display the battery level of a pair of Bluetooth headphones, since I got this feature on Android, but not on Windows. For some reason, it just doesn't display in the settings. I'm using UWP and with the Device Enumerator I managed to pull a list of connected devices. Is there any way to get the battery level from this point? I've seen that people are using RFCom or GATT, but their issue involves connecting to the device, which I think is redundant since the tool is supposed to work on already connected devices.
来源：https://stackoverflow.com/questions/61463798/get-bluetooth-device-battery-level