Adafruit bluefruit ble bluetooth low energy boards adafruit 2633 the adafruit bluefruit friend bluetooth low energy breakout board 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 from your favourite terminal software from software such as python via pyserial or from your smartphone adafruit have built a software stack right into the bluetooth le board so you c