Hey,
I had a very similar issue recently, using an SMI RED-500 eyetracker. I found some relevant information via the following links:
https://github.com/psychopy/psychopy/issues/1811
https://discourse.psychopy.org/t/smi-eyetracker-iviewxapi/1576
In the end, the LaunchHub demo worked in PsychoPy v 1.85.6, but the builder demo didn’t. However, that was a very simple solution and my bad completely. Apparently I did not use a correct ip-configuration (from the pc’s point of view). You don’t provide this info here, but I assumer you’re using two computers (one for presentation and on for the eyetracker)? Are you able to ping to each from the other?