Docs needed

[zhageww]

Honestly speaking, open-PB series are good products, as the performance tests good and the source code are provided. But it could be better if the docs of guidance about how to use it is complete. For instance, after i uploaded the mesh_lpn hex file to my pb-02, and use AT command to join a mesh group, but nothing replys for AT command.
Many thanks, if you can provid the guidance of how to use ble mesh.