Sorry for the delayed response. I try to check the forums weekly, but sometimes I’m out traveling, and sometimes I need to get additional info from colleagues which might take a while.
The EyeX Controller is a TCP/IP eye tracker, and can only be used with the tet-tcp scheme.
As it says in the Gaze SDK Developer’s Guide – General Concepts, in the section about Eye tracker URLs:
The URL for a TCP/IP eye tracker uses the tet-tcp scheme instead of tobii-ttp, and the host part (i.e. the part that follows the double slashes) can be either an IP address or a hostname that the operating system can resolve into an IP address using for example a DNS lookup.