Available Bluetooth Mesh App layers (which are based on resp. Semiconductor

manufacture BLE Mesh stack) are black boxes. So we can't mimic what they

have implemented. 

So is there anyone(developer) who is behind those black boxes to optimise zephyr/samples/boards/nrf52/mesh/onoff_level_lighting_vnd_app further?

(Please refer Bluetooth Mesh Model Specification Table 6.128 for details .

 From my point of view, current implementation is pretty much stable or Okay

& that makes me biased for it).

Is there any one who has successfully implemented

- Light HSL Server/Client models using Zephyr Mesh stack

- which has clear all PTS test rquirements 😃

- and have used something indigenous/superior way than proposed implementation

   in mentioned app ?