Glad we fixed the problem of connecting to the device.
Detailed 802.11s mesh setup is not my expertise, but it is possible to carry multiple networks via the mesh backhaul (it may require using hostapd-full, I think). That said, it probably makes sense to make a new thread for the specifics of that (and thus it can also be titled accordingly to catch the eye of those who are well versed in this aspect).
This thread can probably now be considered solved (we fixed the general connectivity issue).
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
Thanks! 