Sonoff Zigbee/Matter over Thread USB Dongle

The SONOFF Dongle-LMG21 is a compact and installer-friendly USB Zigbee dongle designed for smart home, automation and light commercial projects. It allows a compatible host system, such as Home Assistant, Zigbee2MQTT or openHAB, to act as a Zigbee gateway for local control of Zigbee devices including sensors, switches, relays, lighting controllers and other supported smart home products.

Built around the reliable Silicon Labs EFR32MG21 chip, the Dongle-LMG21 is a strong choice for trade customers who need a simple, flexible way to add Zigbee connectivity to new or existing smart home installations. It is pre-installed with Zigbee coordinator firmware, making it suitable for setting up a Zigbee network, pairing devices and keeping automations running locally through the chosen platform. SONOFF also provides a Dongle Flasher tool, allowing the device to be flashed for other supported roles such as Zigbee Router, OpenThread RCP or MultiPAN RCP where required. 

For installers, the compact USB form factor makes it easy to use with mini PCs, Raspberry Pi systems, Home Assistant servers and other automation controllers. The included USB extension cable helps with better positioning and can reduce interference from the host device or nearby USB ports. This is especially useful in switchboard-adjacent setups, cupboards, racks or other locations where the gateway needs to be positioned for better wireless coverage. 

The Dongle-LMG21 is a practical option for trade customers standardising around open smart home platforms. It supports local, privacy-friendly control, works with a wide range of Zigbee devices depending on the platform used, and provides a low-cost way to deliver more robust smart home installations compared with relying only on Wi-Fi devices or cloud-based hubs.