I got myself a 4C Eye Tracker by Tobii a few weeks ago and everything worked fine, but I just realised that it doesn't anymore, although I didn't change anything, so I'm wondering if any recent patch broke something or I screwed up something on my end. On the desktop and in other games everything works as intended.
In Arma 3 there are two customizeable controllers added when the eye tracker is connected. As far as I can tell the one called "Tobii EyeX Controller" is the older one which doesn't support the headtracking feature the 4C has. If I enabled this one, the eye tracking works, but either can I configure it, nor does the head tracking work. If I enable the second option called "FreeTrack" like I used to have, nothing happens.