Use third "lens"

Hi, the FP4 has a third “lens” or better said a sensor. And when I point with the camera against a mirror, i see that it can emit IR.
What exactly is this sensor for?
And would it be possible to use the Phone as a tv remote like the LG V20?

Kind regards

AFAIK it is a time of flight sensor used for autofocus (and nothing else).


Would be awesome if FP would finally unlock that ToF sensor on hardware level, so we could use it for AR