# 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)