ST and Stackforce have announced a wireless M-Bus (wM-Bus) software stack that leverages the integrated sub-GHz radio and multiple modulation schemes supported by STM32WL MCUs to  cut bill-of-materials cost and enhance flexibility for developers of smart-metering systems.

Developed by Stackforce, the wM-Bus stack complies with most of EN 13757-3/-7, covering the upper layers of the Wireless M-Bus protocol stack, as well as the lower layers (EN 13757-4) and its wM-Bus modes S, T, and C used throughout Europe in the 868MHz band.

The mode N for operation at 169MHz is an option, too.

In addition, it meets several other metering standards, including the most common Open Metering System (OMS) specification, as well as more specific standards like Dutch Smart Meter Requirements (DSMR) or CIG Italian Gas Committee specifications.