55 lines
1.4 KiB
Markdown
55 lines
1.4 KiB
Markdown
# DSMR 2 MQTT bridge
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## Introduction
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This bridigng component reads Dutch Smart Meter Requirements (DSMR) telegrams and sends them to a MQTT broker using the [Homie convention](https://homieiot.github.io/). The component is written in Python and is based on the execelent work of others:
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* [DSMR Parser](https://github.com/ndokter/dsmr_parser)
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* [Homie4](https://github.com/mjcumming/homie4)
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## Configuring the bridge
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Create some environment variables (e.g. with a .env file) to specify the required settings:
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```bash
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PYTHONPATH="."
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MQTT_HOST=<mqtt-broker-hostname>
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DSMR_PORT=/dev/ttyUSB0
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DSMR_PROTOCOL=V5
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```
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If you have forwared the raw serial signal through ser2net, you should use `DSMR_PORT=tcp://<hostname>:<port>`, e.g.:
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```bash
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DSMR_PORT=tcp://forwarding-pi.local:3334
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```
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If you use credentials to access the MQTT broker, then alsp specify:
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```bash
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MQTT_USERNAME=<mqtt-user>
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MQTT_PASSWORD=<mqtt-password>
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```
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Inspect the source [`app_settings.py`](app_settings.py) to find out about the other less frequently used settings.
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## Configuring ser2net
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On the forwarding computer (e.g a Raspberry Pi) you need to install ser2net:
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```bash
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sudo apt upgrade && sudo apt install ser2net
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```
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Then edit the configurion file `/etc/ser2net.yaml` and add
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```yaml
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connection: &Dsmr
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accepter: tcp,3334
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connector: serialdev,
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/dev/ttyUSB0,
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115200n81, local
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```
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