# Reading a SONOFF SNZB-02P on a Raspberry Pi 5

The simplest setup is:

```text
SONOFF sensor -> Zigbee USB dongle -> Zigbee2MQTT -> MQTT -> terminal/application
```

You do not need to open the sensor until Zigbee2MQTT is ready.

## 1. Connect and identify the dongle

Attach the dongle's antenna before powering it. Connect it to the Raspberry Pi,
preferably through a short USB extension cable to reduce USB 3 radio
interference.

Run:

```bash
lsusb
ls -l /dev/serial/by-id/
```

You should see a persistent device path similar to:

```text
/dev/serial/by-id/usb-ITead_Sonoff_Zigbee_3.0_USB_Dongle_Plus_2281293efa9aef1190f1b69061ce3355-if00-port0 -> ../../ttyUSB0
```

Use this `/dev/serial/by-id/...` path instead of `/dev/ttyUSB0` or
`/dev/ttyACM0`, because those shorter names can change after a reboot.

Check the label on the dongle to determine its adapter type:

| Dongle model | Zigbee2MQTT adapter type |
| --- | --- |
| `ZBDongle-P` | `zstack` |


The two dongles have similar names but contain different radio chips.

References:

- [Zigbee2MQTT adapter configuration](https://www.zigbee2mqtt.io/guide/configuration/adapter-settings.html)
- [ZBDongle-P documentation](https://www.zigbee2mqtt.io/guide/adapters/zstack.html)


## 2. Install the Mosquitto MQTT broker

On Raspberry Pi OS, run:

```bash
sudo apt update
sudo apt install -y mosquitto mosquitto-clients
sudo systemctl enable --now mosquitto
systemctl status mosquitto --no-pager
```

```bash
sudo tee /etc/mosquitto/conf.d/zigbee2mqtt.conf >/dev/null <<'EOF'
listener 1883 192.168.178.56
allow_anonymous true
EOF
```
and restart the service

For an initial setup confined to the Pi and a trusted LAN, the local broker is
sufficient. Configure authentication before exposing MQTT outside your trusted
network.

Reference: [Mosquitto downloads](https://mosquitto.org/download/)

## 3. Install Docker and Docker Compose

Identify the operating system and architecture first:

```bash
grep -E '^(ID|VERSION_CODENAME)=' /etc/os-release
dpkg --print-architecture
```

On a Raspberry Pi 5, the architecture should normally be `arm64`. Select the
repository below that matches the reported `ID`. Do not combine an Ubuntu
codename such as `noble` with the Debian repository.

Install the prerequisites:

```bash
sudo apt-get update
sudo apt-get install -y ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
```

### Ubuntu (`ID=ubuntu`, including `VERSION_CODENAME=noble`)

If an earlier attempt installed the wrong Debian source, replace it with
Docker's Ubuntu source:

```bash
sudo rm -f /etc/apt/sources.list.d/docker.list /etc/apt/sources.list.d/docker.sources
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" |
  sudo tee /etc/apt/sources.list.d/docker.list >/dev/null

sudo apt-get update
```

For Ubuntu 24.04, that correctly uses the Ubuntu repository and `noble` suite.

### Raspberry Pi OS or Debian (`ID=raspbian` or `ID=debian`)

Add Docker's Debian source:

```bash
sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | tee /etc/apt/sources.list.d/docker.list >/dev/null

sudo apt-get update
```

Install Docker Engine and the Compose plugin:

```bash
sudo apt-get install -y \
  docker-ce \
  docker-ce-cli \
  containerd.io \
  docker-buildx-plugin \
  docker-compose-plugin
```

Enable Docker at boot and verify the installation:

```bash
sudo systemctl enable --now docker
sudo docker run --rm hello-world
sudo docker version
sudo docker compose version
```

Docker Compose is now invoked as `docker compose`. The old `docker-compose`
command is the legacy standalone version and is not needed.

### Optional: run Docker without `sudo`

Add your current account to the `docker` group:

```bash
sudo usermod -aG docker "$USER"
```

Then log out and back in, or reboot:

```bash
sudo reboot
```

After reconnecting, verify that it works without `sudo`:

```bash
docker run --rm hello-world
docker compose version
```

Membership of the `docker` group effectively gives the account root-level
control of the machine. Only add trusted users.

If `dpkg --print-architecture` reports `armhf`, you are using a 32-bit OS. A
64-bit Raspberry Pi OS or Ubuntu installation is recommended on the Pi 5.

References:

- [Install Docker Engine on Debian](https://docs.docker.com/engine/install/debian/)
- [Install Docker Engine on Ubuntu](https://docs.docker.com/engine/install/ubuntu/)
- [Install Docker Engine on 32-bit Raspberry Pi OS](https://docs.docker.com/engine/install/raspberry-pi-os/)
- [Install the Docker Compose plugin](https://docs.docker.com/compose/install/linux/)

## 4. Run Zigbee2MQTT with Docker

Zigbee2MQTT recommends Docker because it avoids most Node.js and dependency
setup problems. Its image supports the Raspberry Pi's ARM architecture.

If Docker and Docker Compose are already installed, create a working directory:

```bash
mkdir -p "$HOME/zigbee2mqtt/data"
cd "$HOME/zigbee2mqtt"
```

Create a file named `compose.yaml` containing:

```yaml
services:
  zigbee2mqtt:
    container_name: zigbee2mqtt
    image: ghcr.io/koenkk/zigbee2mqtt:latest
    restart: unless-stopped
    ports:
      - "8080:8080"
    volumes:
      - ./data:/app/data
      - /run/udev:/run/udev:ro
    devices:
      - /dev/serial/by-id/REPLACE_WITH_YOUR_DONGLE:/dev/ttyACM0
    environment:
      - TZ=Europe/Amsterdam
```

Replace `REPLACE_WITH_YOUR_DONGLE` with the exact filename returned by:

```bash
ls /dev/serial/by-id/
```

Start Zigbee2MQTT and follow its logs:

```bash
docker compose up -d
docker compose logs -f zigbee2mqtt
```

From another computer, open:

```text
http://RASPBERRY_PI_IP:8080
```

For example:

```text
http://192.168.1.50:8080
```

The first-run onboarding page should appear. Configure these values:

```text
MQTT server: mqtt://172.17.0.1
Serial port: /dev/ttyACM0

Adapter:
  ZBDongle-P -> zstack
  ZBDongle-E -> ember
```

If `172.17.0.1` does not reach Mosquitto, use the Raspberry Pi's LAN IP
instead. Zigbee2MQTT may detect the adapter automatically.

```bash
vi "$HOME/zigbee2mqtt/data/configuration.yaml
frontend:
  enabled: true
```

restart the container:
```bash
sudo docker compose restart zigbee2mqtt
sudo docker compose logs -f zigbee2mqtt
```

References:

- [Official Zigbee2MQTT Docker installation](https://www.zigbee2mqtt.io/guide/installation/02_docker.html)
- [Zigbee2MQTT onboarding](https://www.zigbee2mqtt.io/guide/getting-started/)

## 5. Pair the SNZB-02P sensor

In the Zigbee2MQTT web interface:

1. Click **Permit join**.
2. Open the SNZB-02P.
3. Remove the battery insulation tab.
4. Hold its button for about five seconds, until the LED flashes.
5. Keep the sensor close to the dongle during pairing.
6. Wait for Zigbee2MQTT to report that the device was successfully interviewed.
7. Rename it to something simple, such as `living_room_sensor`.
8. Turn **Permit join** off afterward.

The device page should now show temperature, humidity, and battery level. The
SNZB-02P uses a CR2477 battery.

Reference: [SNZB-02P device support](https://www.zigbee2mqtt.io/devices/SNZB-02P.html)

## 6. Read the temperature

Listen for sensor updates on the Raspberry Pi:

```bash
mosquitto_sub -h localhost \
  -t 'zigbee2mqtt/living_room_sensor' \
  -v
```

A message will look similar to:

```json
{
  "battery": 100,
  "humidity": 48.2,
  "linkquality": 132,
  "temperature": 21.6
}
```

To print only the temperature, install `jq` if necessary:

```bash
sudo apt install -y jq
```

Then run:

```bash
mosquitto_sub -h localhost \
  -t 'zigbee2mqtt/living_room_sensor' |
jq --unbuffered '.temperature'
```

Battery-powered sensors normally report periodically or when their readings
change, rather than continuously. The SNZB-02P publishes `temperature` in °C
and `humidity` as a percentage.

Reference: [Zigbee2MQTT MQTT topics](https://www.zigbee2mqtt.io/guide/usage/mqtt_topics_and_messages.html)

## 7, reading with curl
```bash
curl --silent --max-time 2   "mqtt://192.168.178.247/$topic" | dd bs=1 skip=$((2 + ${#topic})) status=none
{"battery":100,"humidity":56.3,"humidity_calibration":0,"temperature":27.1,"temperature_calibration":0,"update":{"installed_version":8704,"latest_release_notes":null,"latest_source":"https://raw.githubusercontent.com/Koenkk/zigbee-OTA/master/images/Sonoff/snzb-02p_v2.2.0.ota","latest_version":8704,"state":"idle"}}
```

## 8. Store six sensors in RRD files and create graphs

Zigbee2MQTT must retain each sensor's state so the collector can obtain the
latest reading without waiting for a sleeping sensor:

```yaml
device_options:
  retain: true
```

Install RRDtool and create a Python virtual environment in this project:

```bash
sudo apt install -y rrdtool python3-venv
cd "$HOME/service_zigbee"
python3 -m venv .venv
.venv/bin/pip install -r requirements.txt
```

Edit the supplied `config.yaml`. MQTT settings, collection timing, storage
paths, logging, all six sensors, RRD archives, and graph presentation are
configured in this one file. Replace all five `CHANGE_ME` topics with the
friendly names shown by Zigbee2MQTT:

```bash
nano config.yaml
```

Sensor entries whose `name` begins with `CHANGE_ME` are placeholders and are
excluded from MQTT polling, RRD creation, graphs, and the HTML dashboard. Rename
an entry when its physical sensor is ready. The marker is configurable:

```yaml
collection:
  excluded_name_prefix: CHANGE_ME
```

By default, the databases are written to `/var/lib/rrd` and the generated
graphs to `/var/www/html/sensors`. Create those directories and grant the user
running the collector ownership:

```bash
sudo install -d -o "$USER" -g "$USER" /var/lib/rrd
sudo install -d -o "$USER" -g "$USER" /var/www/html/sensors
```

Both paths can be changed under `storage` in `config.yaml`:

```yaml
storage:
  data_directory: /var/lib/rrd
  graph_directory: /var/www/html/sensors
```

Test one collection cycle:

```bash
.venv/bin/python read_temperature.py --once
```

The script creates one RRD file per sensor in the configured data directory and
three PNG files per sensor in the configured graph directory:

- `*_day.png` covers the last 24 hours.
- `*_month.png` covers the last 31 days.
- `*_two_years.png` covers the last two years.

Each graph contains a filled temperature area, a solid humidity line, and a
dotted battery line. Initially, most of each graph is blank because no historic
samples existed before the RRD was created.

Temperature uses the left axis with a default range of 0–30°C. Humidity and
battery use the right axis with a default range of 0–100%. These ranges and
labels can be changed in `config.yaml` under `graph.axes`. Temperature grid
labels default to five-degree intervals, and both axes display integers. Since
RRDtool ties the right axis to the left, the corresponding percentage labels
are rounded to integers. Light-grey reference lines are drawn at 15, 20, and
25°C by default and can be changed under
`graph.axes.temperature.reference_lines`.

The collector also generates `/var/www/html/sensors/index.html`. It displays
six graphs at a time and has controls for switching between the daily, monthly,
and two-year periods. It remembers the selected period and refreshes the PNGs
at the interval configured under `html.refresh_seconds`.

With a web server serving `/var/www/html`, open:

```text
http://RASPBERRY_PI_IP/sensors/
```

The page settings are configurable in `config.yaml`:

```yaml
html:
  filename: index.html
  title: Zigbee sensor history
  default_period: day
  refresh_seconds: 600
```

RRD structure settings are used only when each `.rrd` file is first created.
Changing `rrd.step_seconds`, data sources, or archives does not rewrite an
existing database; preserve or remove the old RRD deliberately before creating
a replacement.

Run the ten-minute collection loop in the foreground with:

```bash
.venv/bin/python read_temperature.py
```

To run it automatically as a user service, copy the supplied service file. It
assumes this repository is located at `$HOME/service_zigbee`:

```bash
cp zigbee-sensors.service.example /etc/systemd/system
systemctl daemon-reload
systemctl enable --now zigbee-sensors.service
```

Inspect its status and live logs with:

```bash
systemctl --user status zigbee-rrd.service
journalctl --user -u zigbee-rrd.service -f
```

Graphs can be regenerated without collecting a new MQTT reading:

```bash
.venv/bin/python read_temperature.py --graph-only
```

References:

- [RRDtool database creation](https://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html)
- [RRDtool graph elements](https://oss.oetiker.ch/rrdtool/doc/rrdgraph_graph.en.html)