Adafruit bluetooth bluefruit le friend ble 4 0 nrf51822 adafruit 2267 p the adafruit bluefruit le friend lets you cut through the pile of bluetooth classic apis development tools and licences and treat a bluetooth le connection just like a serial link send and receive keystrokes via your favourite terminal software or via software such as python via pyserial the necessary software stack is built right into the bluetooth le board so you can focus on sending and receiving the data you w