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Updating firmware for already installed LoRaWAN sensors becomes easier.

STMicroelectronics announced on the 13th that it supports firmware update over the air (FUOTA) with 'I-CUBE-LRWAN', an STM32 LoRaWAN software expansion package.

The LoRa Alliance has announced three FUOTA LoRaWAN application specifications (v1) that it standardizes while supporting FUOTA: ▲Application Layer Clock Synchronization, which performs time synchronization; ▲Remote Multicast Setup, which performs message transmission to a group of end devices; and ▲Fragmented Data Block Transport, which performs data file segmentation.

STM32 developers can develop LoRa endpoint devices with I-CUBE-LRWAN. The device supports FUOTA for STM32L4 MCUs leveraging 'X-CUBE-SBSFU', a Secure Boot and Secure Firmware Update solution together with an open-source cryptographic library.

New firmware versions allow the built-in program in the STM32L4 to be updated, adding new features and fixing potential issues. The update process is performed in a secure manner to prevent unauthorized updates and access to confidential device data.

The pack contains the LoRaWAN stack along with the hardware abstraction layer and sample application code for STM32L0, STM32L1, and STM32L4 MCUs, as well as a test application for LoRaWAN certification tests.

The I-CUBE-LRWAN software can be used with sensor expansion boards and LPWAN development boards of the STM32 Nucleo ecosystem, such as the LoRa nodes included in the P-NUCLEO-LRWAN2 and P-NUCLEO-LRWAN3 developer packs.

The latest I-CUBE-LRWAN expansion package supporting FUOTA for STM32L4 is available free of charge here . It interoperates with a variety of network servers including Actility and Senet. ST will integrate other network servers that are interoperable with the LoRaWAN protocol in the future.