opendtu-logger/README.md

# OpenDTU logger

OpenDTU logger connects to the OpenDTU livedata websocket and captures metrics.
These metrics are inserted into a PostgreSQL database.
Optionally, TimescaleDB can be used.

## Install instructions

### Docker

```sh
docker pull git.hollander.online/energy/opendtu-logger:0.0
```

Preferably, run the Docker image using the Docker compose examples provided in the `./docker` folder.

### Binary

Go to the [releases page](https://git.hollander.online/energy/opendtu-logger/releases) and download the most recent stable release.

#### Running the binary as local user

```sh
REMOTE_URL="opendtu:80" DB_URL="host=localhost port=5432 user=postgres password=secret dbname=dtu sslmode=disable" TIMESCALEDB_ENABLED="true" TZ="Europe/Amsterdam" ./opendtu-logger
```

#### Creating a more permanent setup on Linux using systemd

```sh
sudo adduser --system --group --disabled-login --home /opt/opendtu-logger opendtu-logger

sudo mkdir /opt/opendtu-logger
sudo mkdir /opt/opendtu-logger/data
sudo mv ./opendtu-logger /opt/opendtu-logger/

sudo chown -R opendtu-logger:opendtu-logger /opt/opendtu-logger
```

```sh
sudo nano /etc/systemd/system/opendtu-logger.service
```

Add the contents of `systemd/opendtu-logger.service` and alter the `REMOTE_URL` and `DB_URL` Environment variables to match your setup.

### PostgreSQL setup

The OpenDTU logger logs to a PostgreSQL database and optionally supports TimescaleDB. Create a separate database and user using the following commands.

```sql
CREATE DATABASE opendtu_logger;
CREATE USER opendtu_logger WITH password 'SECRET';
GRANT ALL privileges ON DATABASE opendtu_logger TO opendtu_logger;
GRANT ALL ON SCHEMA public TO opendtu_logger;
```

Optional: enable TimescaleDB extension

```sql
\c opendtu_logger
CREATE EXTENSION OF NOT EXISTS timescaledb;
```

## Environment variables

The following environment variables are required for OpenDTU Logger to be configured.

```conf
REMOTE_URL="opendtu:80"
DB_URL="host=localhost port=5432 user=postgres password=secret dbname=dtu sslmode=disable"
TIMESCALEDB_ENABLED="true"
TZ="Europe/Amsterdam"
```

## Grafana

The `grafana` folder contains example dashboards.

- The `opendtu_` dashboards contain visualisations for each table the OpenDTU logger records to.
- `PV.json` is a dashboard which combines the visualisations of each table that I found to be most useful.
- `Zonnepanelen.json` is the same as `PV.json`, but in Dutch language.

## Known issues

- The logger will currently log every event posted by OpenDTU to the websocket. Checks still need to be added to determine the uniqueness of an event. For more information, see also [this OpenDTU Github issue](https://github.com/tbnobody/OpenDTU/issues/1800).
- Upon restart of the OpenDTU, OpenDTU Logger will need to be restarted manually as well. Automatic reconnection logic is a work in progress. Using the `systemd` service file provides a workaround for this.