nrf util.pdf

The nRF Util application is a Python package and command-line utility that supports Device Firmware Update (DFU) and cryptographic functionality. The nRF Util application and its library has the following features: • DFU package generation • Cryptographic key generation, management, and storage • Bootloader settings generation • DFU procedure on the following protocols: • Bluetooth® Low Energy • Serial over UART • Serial over USB • Thread unicast • Thread multicast • Zigbee • ANTTM There are two different DFU package formats: • Legacy – Uses a simple structure and no security. • Modern – Uses Google's protocol buffers for serialization and can be cryptographically signed.