It's so you can update the firmware via DFU on BLE. If you don't want to do that then you can leave it out
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's so you can update the firmware via DFU on BLE. If you don't want to do that then you can leave it out