I think Zephyr OS has better support for "Bluetooth Mesh" than Nordic own MESH SDK
Is nordic has any plan to release MESH related examples which support this play.google.com/.../details Android APP ?
We are not the one who is behind the Bluetooth Mesh on Zephyr. I couldn't find much documentation on the mesh implementation there. I think the question would be best answered on Zephyr site.
Please direct this question to the zephyr-devel or zephyr-users mailing list instead:
You can also join #zephyrproject on freenode.net to get additional help.
You need the Silicon Labs Bluetooth Mesh app to do the provisioning. Provisioning is enabled on both PB-GATT and PB-ADV (at least in the source it is) but you need to change the dev-id for each dev kit, because it is a static one in the demo code.
The nordic stack / samples are completely unrelated to zephyr. So this forum won't help you much.
I am not an employee so I have no clue.