Hi, for the moment we don't support Hololens. Everything we tried failed, even if same DLLs are running on Linux, Windows, MacOs, Android and IOs. We don't know why Hololens is not working and we are stopping to spend further effort. Sorry.

It should work with some minor changes which you would need to do on your own. Officially, we only support latest LTS releases.

I never checked this kind of setup. Did you selected the follow parent option in G4A (https://game4automation.com/documentation/current/transportsurface.html#Transport-Surfaces-and-Unity-Physics),

Could you send me your example so that I could check it on my computer?

For changing the local 0 point you could embed it into an empty game object manually or use the Kinematic script for doing that on startup or you can change the zero point on the CAD side.

There are on Github MQTT Libraries for .Net available you could use with Unity.

On our side MQTT is planned but so far not with very high priority because MQTT is not much used on PLCs.