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How to get Oculus Rift/Rift S touch controllers battery level?

HMathias13
Level 2
Hello,

I urgently need to access to touch controllers battery level from Unity, i know it's available somewhere because we can see the battery level in the Oculus Software, but I tried several ways and no method works:

1) In Unity, use Oculus Utilities asset's OVRInput.GetControllerBatteryPercentRemaining() method:
It returns 0 and the method's summary says "Retuns the battery percentage remaining for the specified controller. Values range from 0 to 100. Only applicable to controllers that report battery level, such as the GearVR Controller. Returns 0 for controllers that do not report battery level" so i concluded that Touch Controllers don't report battery level to OVRInput.
This person has the same problem : 
https://forums.oculusvr.com/developer/discussion/69979/oculus-go-get-controller-battery-level  and Oculus given no answer.

2) In Unity, use the 
OpenVR.System.GetFloatTrackedDeviceProperty() method as it's adviced here: https://answers.unity.com/questions/1478339/get-vive-oculus-touch-battery-status.html
The method returns a TrackedProp_UnknownProperty error for each controller device id.

3) Search in Oculus SDK (
https://developer.oculus.com/downloads/package/oculus-sdk-for-windows/) methods:
There is no occurrence of "battery" word in the sdk folder and the ovrTrackingState::HandPoses and ovrInputState objects only provides position/orientation/velocity/accelerations/buttonPress informations. 
This person has the same problem (
https://forums.oculusvr.com/developer/discussion/78140/get-controller-battery-level-for-oculus-rift-...) and Oculus given no answer.


Anyone has found a solution for this problem? 

Software versions used:
Unity 2019.2.7f2
Unity Oculus Utilities 
1.31 and 1.40
Oculus SDK 1.40
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