I use Bluetooth headset that use Bluetooth version 4.1. When I connect with android it shows the battery status. But with Linux (Ubuntu 18.04) I cannot get battery status. I tried with bluetoothctl, looking file in /sys/class/power_supply as in other questions, But they didn’t help me. askubuntu.com/questions/53880/is-there-any-way-to-check-the-battery-percentage-of-apple-wireless-peripherals stackoverflow.com/questions/49078659/check-battery-level-of-connected-bluetooth-device-on-linux My bluetooth device don’t use GATT profile. It uses A2DP sink for