This utility reads the telegrams from your DSMR-compatible smart meter and sends it to a MQTT broker. I made use of dsmr-p1-parser and libmosquitto.

I wrote this so I would be able to plug my smart meter into my OpenWRT router with a prefabricated cable (I used this one: https://www.sossolutions.nl/slimme-meter-kabel).

I used the MQTT topic definitions of dsmr-reader. If you want to use other definitions, you can change the the #defines at the beginning of the dsmr2mqtt.c file.

First make sure you have git installed and the necessary library.

# apt install git libmosquitto-dev

Then get the source code and use the command make to build the dsmr2mqtt executable:

$ cd [whatever build dir]
$ git clone https://github.com/terual/dsmr2mqtt
$ cd dsmr2mqtt
$ make
$ ./dsmr2mqtt

To compile this for OpenWRT, use the following guide, place the Makefile.openwrt in a seperate dsmr2mqtt package folder, and rename it to Makefile.

Usage:  dsmr2mqtt [-d <serial_device>] [-m <mqtt_broker_host>] [-p <mqtt_broker_port>]
    -d <serial_device>      Serial device for DSMR device (default is /dev/ttyUSB0)
    -m <mqtt_broker_host>   Host name for MQTT broker (default is localhost)
    -p <mqtt_broker_port>   Host name for MQTT broker port (default is 1883)