I teach high school robotics and after the BLE blinky program which works greata with mobile nrf-connect, I wonder what people think is the best, generic BLE
Central and Peripheral example to run, that is easy to get going with 2 boards, but actually teaches a lot about BLE, possibly with mobile App nrf-connect communication.
Wading through the examples to find great apps, when my experience with BLE is limited is a bit confusing.