evirtual

Hello, I've just read this morning the documentation for the vive tracker 2018 (developer guidelines) and compare to the documentation of the older version of the vive tracker, the possibility to send data to the vive tracker through usb inteface instead of POGO pin has disapeared in Use Case 5 (as well as the section regarding data format of the USB interface). Is it just a missing or really usb interface is no more supported with Vive tracker 2018? thanks