blog.bluetooth.com/management-of-devices-bluetooth-mesh-network
The Provisioning Protocol
During provisioning, the Provisioner and the Device to be provisioned communicate using a Bluetooth mesh protocol called the Provisioning Protocol. The Provisioner may use the Provisioning Protocol over either of the PB-ADV or PB-GATT bearers[i], ensuring that Provisioner applications may be implemented on older smartphones, only requiring that they have support for Bluetooth Low Energy (LE) and GATT.
Means nordic MESH SDK is only supporting PB-ADV bearer.
How to enable PB-GATT so that we can use this APP as provisioner ?? play.google.com/.../details