Is android nrf_blinky sample using UART?

[ox00]

I have a hard time understanding about BLE. I know that this sample is receiving and sending data. But I am not sure is it using UART ? 

[Kenneth]

To build experience with BLE I suggest to start:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-advertising-a-beginners-tutorial

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial