Requires Adafruit Bluefruit nRF52 BSP to compile How to install check here - https://learn.adafruit.com/adafruit-itsybitsy-nrf52840-express/arduino-support-setup
Android based smart phone remote controller app: https://github.com/xchg-dot-ca/Android-nRF-UART-Bescor