Send AG devices battery level to ESP32

[Vilius20]

Going through the Bluetooth classic documentation, I wasn't able to find a way to receive the battery level 0-5 from the AG device (phone in my case), while the ESP works as the HF device, only to update the battery level of the ESP. My end goal is to be able to receive the battery level of the phone, is this possible?

[aliarifat794]

Not all phones implement the HFP battery reporting feature. You can verify by connecting your phone to a commercial HF device that supports HFP (e.g., a car kit) and checking if the battery level is displayed.