# GetNetatmoData v2

A small Flask service that polls Netatmo's Weather API every ten minutes, stores
the readings in RRDtool databases, and serves a responsive graph dashboard.

## What it stores

The service creates `outdoor.rrd`, `wind.rrd`, `bedroom.rrd`, `study.rrd`, and
`living.rrd`. Each has ten-minute archives for the last two weeks and six-hour
archives covering a year. Day, two-week, and year PNG graphs are rendered on
demand. The wind graph splits average wind into 12 colored direction bands and
draws gusts as a line.

The Outdoor module does not contain a pressure sensor, so `outdoor.rrd` combines
its temperature/humidity with pressure from the main station. A module without
`dashboard_data` is skipped until it becomes reachable again.

## Prerequisites and setup

Install the RRDtool Python binding and native library using your operating
system package manager (for example `apt install python3-rrdtool` on Debian or
Ubuntu), then set up the Python application. If your distribution does not
provide the binding, `pip install -r requirements.txt` installs its PyPI package
but may require the RRDtool development headers and a C compiler.

```sh
python3 -m venv .venv
.venv/bin/pip install -r requirements.txt
cp .env.example .env
```

Add the client ID and secret for the Netatmo application **GetNetatmoData v2**
and a refresh token to `.env`. Netatmo's OAuth authorization step must be used to
obtain the initial refresh token with the `read_station` scope. Secrets are read
from environment variables and are never stored in an RRD.

Export the file and run Flask:

```sh
set -a
. ./.env
set +a
.venv/bin/flask --app wsgi run --host 0.0.0.0
```

Open <http://localhost:5000/>. Keep one application worker because the polling
scheduler runs inside the service process. Alternatively set
`START_COLLECTOR=false` in web workers and invoke this from a system timer:

```sh
.venv/bin/flask --app wsgi collect-now
```

`RRD_FOLDER` configures the database directory (default `./rrd`). The module
variables in `.env.example` allow the five Netatmo display names to be changed.

## HTTP API

```text
GET /last/<rrd-name>/<data-point>
GET /graph/<rrd-name>/<period>
GET /graph/<rrd-name><period>       # compact compatibility form
GET /health
```

Periods are `day`, `2weeks`, and `year`. Examples:

```sh
curl http://localhost:5000/last/outdoor/humidity
curl --output wind.png http://localhost:5000/graph/wind/2weeks
```

Data points are:

- `outdoor`: `min_temp`, `max_temp`, `humidity`, `pressure`
- `wind`: `gust`, `average`, `angle`
- `bedroom`, `study`, `living`: `temperature`, `co2`, `humidity`

The service creates missing RRDs at startup but deliberately does not alter an
existing RRD schema. If a schema is changed in code, migrate or archive the old
files before restarting.