SONOFF Dongle-LMG21 (Dongle Lite MG21) is a compact USB Zigbee 3.0 coordinator that can be used to create fast, reliable local control under Home Assistant, Zigbee2MQTT, openHAB and other platforms. The hardware based on the EFR32MG21 radio chip provides a stable Zigbee mesh network, so different brands of bulbs, switches and sensors can be paired and controlled within one system.

The dongle works in Plug&Play mode on Windows, Ubuntu and Raspberry Pi OS systems (also in the Docker environment), and its external ≤180° adjustable antenna provides a better range. Flashable firmware (Zigbee NCP/Router, OpenThread RCP, MultiPAN) is available for advanced users, so it can be configured for multiple network roles as needed.

A cost-effective, entry-level/mid-range solution for building your own Zigbee network, with DIY-focused community support. Ideal for the backbone of small and medium-sized smart homes.

Main product features

- Compact Zigbee coordinator: for building a stable Zigbee 3.0 mesh network, with brand-independent device pairing.
- Wide platform support: works with Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz and Jeedom systems.
- Plug&Play use: fast installation in Windows, Ubuntu, Raspberry Pi OS and Docker environments.
- Flashable firmware: Zigbee NCP/Router, OpenThread RCP and MultiPAN modes for advanced settings.
- External antenna: ≤180° adjustable antenna for better signal level and range.

Smart home protocols and platform compatibility

- Supported protocols: Zigbee 3.0 (default); in advanced mode OpenThread RCP / MultiPAN (depending on firmware).
- Compatible platforms: Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, Jeedom.
- Local control: control paired Zigbee devices on LAN, without cloud.
- Operating systems: Windows, Ubuntu, Raspberry Pi OS; can also be used with Docker.

Smart functions

- Creating a Zigbee mesh: creating a stable, expandable network with its own coordinator and connecting devices.
- Brand-independent device management: uniform integration of bulbs, switches and sensors from different manufacturers.
- Advanced modes: in case of firmware replacement, Router/RCP/MultiPAN modes for special use.

Electrical functions

- Power supply: 5 V⎓ / 500 mA (via USB).

Other features

- Cover: PC+ABS housing.
- External antenna: adjustable, ≤180°.
- DIY focus: community guides are available for advanced functions (e.g. firmware replacement).

Technical specifications

- Model: SONOFF Dongle-LMG21 (Dongle Lite MG21)
- SoC / Radio: Silicon Labs EFR32MG21
- Protocol: Zigbee 3.0 (flashable: Zigbee NCP/Router, OpenThread RCP, MultiPAN)
- Compatibility: Home Assistant (ZHA), Zigbee2MQTT, openHAB, ioBroker, Domoticz, Jeedom
- OS support: Windows, Ubuntu, Raspberry Pi OS; Docker
- Power supply: 5 V⎓ / 500 mA (USB)
- Dimensions: 133 × 18.6 × 10.1 mm
- Operating temperature: 10–60 °C
- Humidity: 5-95% RH
- Note: Thread/MultiPAN functions require a firmware update; the setting is recommended for advanced users.

Description:

- Manufacturer: Sonoff
- Communication protocols: Thread, Zigbee
- Color: Black

Installation / operation

- Operating power supply: 5V DC USB-A
- Operating ambient temperature: 0°C-60°C
- Operating ambient humidity: 5%-95% RH
- IP protection: Indoor device

Supported protocols

- Ethernet / wired network (RJ-45): No
- Wi-Fi: No
- Zigbee: Yes: Zigbee gateway
- Z-Wave: No
- Thread: Yes
- RF / radio control: No
- Bluetooth: No

Remote control, smart control

- Local network mode: Yes
- MQTT: Zigbee2MQTT, ZHA

Other

- Dimensions: 13.3 × 1.83 × 1.01 cm