Sensor APIs do not work

 OrientationSensor {
            onReadingChanged: {
                if ( reading.orientation === OrientationReading.TopUp) {
                    console.log("TopUp")
                } else if ( reading.orientation === OrientationReading.TopDown) {
                    console.log("TopDown")
                } else if ( reading.orientation === OrientationReading.LeftUp) {
                    console.log("LeftUp")
                } else if ( reading.orientation === OrientationReading.RightUp) {
                    console.log("RightUp")
                } else if ( reading.orientation === OrientationReading.FaceDown) {
                    console.log("FaceDown")
                } else if ( reading.orientation === OrientationReading.FaceUp) {
                    console.log("FaceUp")
                }
            }
        }

The "FaceDown" and "FaceUp" events are never fired. Also

       AmbientLightSensor {
            active: true
            onReadingChanged: {
                if (reading.lightLevel === AmbientLightReading.Dark) {
                    console.log("It is dark")
                } else if ( reading.lightLevel === AmbientLightReading.Twilight) {
                    console.log("It is moderately dark")
                } else if ( reading.lightLevel === AmbientLightReading.Light) {
                    console.log("It is light (eg. internal lights)")
                } else if ( reading.lightLevel === AmbientLightReading.Bright) {
                    console.log("It is bright (eg. shade)")
                } else if ( reading.lightLevel === AmbientLightReading.Sunny) {
                    console.log("It is very bright (eg. direct sunlight)")
                }else if ( reading.lightLevel === AmbientLightReading.Undefined) {
                    console.log("It is unknown")
                }
            }
        }

Only "AmbientLightReading.Light" is fired no matter how the ambient light environment is changed.

Thanks & best regards,
XiaoGuo