Question about Esp-idf BLE Mesh stack

[YouJungChoi]

<Question about Esp-idf BLE Mesh stack>

Hello

I tested LED on/off example, one of esp-idf's BLE Mesh examples, as follows.

- Onoff_client test using one esp32-wrover-e and nrf mesh Application (Samsung smartphone)

During the test, BT Mesh Proxy Protocol type data was transmitted and received.

1. In the case of the BT Mesh Proxy Protocol, I know that it is a communication method used by devices other than the BLE Mesh stack. Is the BLE Mesh stack model implemented in esp-idf an official Bluetooth model?
The meaning that it is not an official Bluetooth model means that the BLE Mesh stack model used by esp-idf is implemented as it is regardless of authentication.

2. Using esp-idf's Bluetooth Mesh stack, 10 esp32-wrover-e and devices running nrf mesh applications are trying to communicate. Can I put all 10 proxy nodes in?

additional questions
3. In the past, nordic uart service was used using nordic's nrf52832 and BLE stack. Is it possible to configure a similar custom model for esp32 BLE Mesh stack?

If you know of any of these three questions, please answer them.

Thank you.