I built an interface called WiFi ACM-ESP, based on an ESP8266 which can be connected to BK-G4…A gasmeters. It reports the values of the meter via MQTT autodiscovery to home assistant or other targets. The readings are always absolute as the meter has optical encoders.
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Nice, the price you are charging is reasonable but is there a variant that is customizable (with (partially) open source firmware) or just a “bridge to UART” version ?
I prefer ESP32-C6 based devices with ESPHome if at all possible, these can double as BLE repeater and support 802.11ax. With ESPHome the API integration with Home assistant is also easier (no MQTT needed)
The sourcecode is not open. But there is the configuration option to have the WiFi ACM-ESP as a bridge to TCP/IP device to be used with a m-bus library.