This repository contains the source code for fetching DSMR 4.2 telegrams from a Dutch residential electricity meter, and publishing them over Ethernet to an MQTT broker.
It is meant to be built for a Teensy 4.0, with one of its UARTs connected to the meter, and one of its SPI controllers connected to an ENC28J60 ethernet controller.
The subproject dsmr42 contains a nostd-compatible DSMR 4.2 parsing library.
While its code is mostly generic, it contains a few assumptions that are
specific to DSMR 4.2 and my own meter. It can easily be adapted to other meters
and DSMR versions as well.
The Ethernet code depends on geluk/enc28j60, which I have forked from japaric/enc28j60 in order to incorporate a few more checks and errata fixes into the driver.
The default configuration expects the following pin connections:
| Teensy pin | Peripheral | Peripheral pin |
|---|---|---|
9 |
ENC28J60 |
Reset |
10 |
ENC28J60 |
Chip select |
11 |
ENC28J60 |
MOSI |
12 |
ENC28J60 |
MISO |
13 |
ENC28J60 |
SCK |
15 |
Meter |
TX (uninverted!) |
Note that by default, DSMR 4.2 produces inverted UART signals.
The default configuration of this repository expects a hardware inverter
to be connected between the meter and the Teensy, but it is also possible to
use the Teensy's own inverter. To enable this, set DSMR_INVERTED to true in
meter-reader/main.rs.