Thanks for your PR. I will take a closer look later this week, now I'm into some funky openthread behaviour.
There are lots of stuff for the Mesh I need to add, but for multisocket I did not wrote any code.
@jardar I don't work for PyCom, so I don't know what they have planned for the future.
For sure it would be of interest to have an idea of what they are going to implement (or not going to implement) in the next future.