The module (PCB top, PCB bottom)
is used to connect home appliances to the Home Connect cloud.
The model COM1 3/21 with FCC ID 2AHES-COMGEN1 uses an
ST STM32F415 MCU (LQFP64 package, 1024kB flash)
and an external 16MBIT/2024kB SPI MX25L1606EZNI flash.
There is a 30-pin connector on the board (looks like a Hirose DF12 board-to-board/BTB) that, in certain module configurations (e.g. EPH71082), is used to connect to the antenna PCB. The antenna PCB seems to have an 6-pin connector presumably used for programming or debugging the MCU.
The firmware of the STM32F4 MCU can be dumped via D-Bus with subsystem S=0 cmds.
The external flash seems not to be memory-mapped within the MCU. It can be dumped with a WSON8 clip (6x5 spacing) like this:
flashrom -V -p ch341a_spi -c "MX25L1605A/MX25L1606E/MX25L1608E" -r com1-extflash.bin
The dump contains an SSL client certificate (unique for each module), various CA certificates for the (private) PKI infrastructure, various runtime settings e.g. WiFi credentials and a ZIP file with update images for the module.
The module has not been analyzed in detail. Some information can be found here. It is suspected that the STM32F4 and the WLAN/Bluetooth were combined into a (propietary?) single IC for the COM2, which is probably more cost-effective.
No info yet. See here
It is suspected that this module not only establishes Internet connectivity, but also controls the entire logic of the household appliance (hence “system master”), i.e., it takes over the tasks that were previously performed by the power module.
The SMM modules use a proprietary BSH Embedded Linux Platform operating system.
Some parts have been open-sourced, e.g. they have been included in the Buildroot distribution.
No info yet. See here