Vive ultimate tracker order[Unreal 5.3]

[darsac]

Hello,

I am currentrly working on an implementation of vive ultimate tracker for full body tracking on unreal 5.3 in apk for focus 3. I use ViveOpenXR and i use the "Ultimate Tracker 1 to 4" identifier in motion controller source. They are well recognized but their order depends on the order in which the tracker are turned on and not their number in the vive. 

Do youo have an idea to allow using the vive tracker order insted of the tracker starting order ?

Thanks