Mesh network - BLE Configuration through Android Phone App

[MRomano]

Hi all -

I'm still trying to configure a minimal mesh network with 3 ESP32-DevkitC boards.
I have used the sample \esp-mdf\examples\function_demo\mconfig on ESP32 boards, and either ESP-Mesh and ESP32WiFiBLE apk APP on Android Phone. The App find the BLE devices and connect for configure WiFi parameters but the operation do not end, the application hang without close the procedure (see screenshot).
Can you suggest how to fix it, or what am I doing wrong? Maybe the android APP is not the right one for this configuration?

Thanks for your support
MRomano