STMicro STM32WL was introduced as the world’s first LoRa SoC last year as it combined an STM32L4 Arm Cortex-M4 microcontroller with Semtech SX126x LoRa radio.
The company has now partnered with Stackforce to develop a wireless M-Bus (wM-Bus) software stack that leverages the integrated sub-GHz radio and multiple modulation schemes supported by STM32WL microcontrollers. Wireless M-Bus (Wireless Meter Bus) is a wireless protocol specifically designed for remote reading of smart meters, generally gas, water, or electricity meters.
The wM-Bus stack developed by Stackforce is said to comply with most of EN 13757-3/-7 specifications from lower to upper layers. The stack notably supports Wireless M-BUS modes S, T and C used throughout Europe in the 868MHz band, as well as the mode N for operation at 169MHz that also happens to be Wize frequency.
Stackforce Wireless M-Bus stack for STM32WL also meets requirements for several other metering standards, including the Open Metering System (OMS) specification, the Dutch Smart Meter Requirements (DSMR), or CIG Italian Gas Committee specifications.
The Stackforce wM-Bus stack is available now, and a wM-Bus over LoRaWAN stack will be available at the end of July 2020. It is delivered as a binary package and an evaluation version is provided. Customers can either pay royalties based on the number of chips, or a lump sum to license the stack.
More details may be found via the product page.