Hey Flauipauni,
I understand that you want clarification if the DAESSC solver can solve index 2 or higher DAEs.
No, DAESSC has not been designed for higher index DAEs. It may work on them, but it will likely get stuck at some point on min step error or will encounter a singular matrix somewhere. That said, Simscape will reduce the index to 1 before calling DAESSC solver.
Hope this helps you with your understanding.
