Extended battery information

[lemmingDev]

Hi

Is it possible to access new battery service v1.1 data as outlined here:

https://www.bluetooth.com/specifications/specs/battery-service/

Specifically things like indicating to the host whether it's currently charging, and the ability to define devices with left and right batteries

3.2.1.2. Power State field seems it would satisfy the first one

I had a quick look at NimBLE source, but I couldn't find any existing functions apart from setting and reading the battery power level, which works well for that

A few people have asked over in the ESP32-BLE-Gamepad GitHub

Thanks

[h2zero]

This isn't built in to the HID class but the characteristics would just need to be added to the battery service like the battery level currently is, pretty easy to do.

[lemmingDev]

Thanks for the support

Just to clarify, is this something to be added in a sketch, or to the actual library?

[h2zero]

You could add it in the sketch, just need to get the battery service instance from the server or HID device instance and add the characteristics before starting advertising.

[lemmingDev]

Would m_batterySvc need to be made public to do this?

[h2zero]

Nope, that is what this is for:

NimBLE-Arduino/src/NimBLEHIDDevice.cpp

Line 340 in 351f7c3

NimBLEService* NimBLEHIDDevice::getBatteryService() {

[lemmingDev]

Got it - thanks!

[lemmingDev]

Done!

I added 2A1A Battery Power State, and can set all the values at will

Thanks for the help

[h2zero]

Awesome! You're welcome.