What happened to the LIGGGHTS/HOTINT Co-Simulation ?

Hi, a more academic question as I'm writing the last pages of my PhD Thesis (hopefully):
What happened to the LIGGGHTS/HOTINT Co-Simulation [1] ? I've noticed that the src is still in lib folder but I didn't find any fix or a control application to use it. Has it ever been possible to couple HOTINT with granular package - or was it limited to SPH Domain?
Is the work still in progress or is it left as it is?

Thanks,
Christian.

[1] https://www.cfdem.com/media/DEM/featured/schoergenhumer/master_thesis_m_...