The SMLIGHT SLZB-MR2U is a Zigbee/Thread adapter designed for advanced users and complex smart home systems, which can be used via Ethernet or Wi-Fi. One of its biggest advantages is that it does not need to be connected directly to the USB port of a Home Assistant server or other controller. When connected via Ethernet, it can be placed further away, allowing for better radio coverage—even in another room or separate building. This is especially useful when the server is not ideally positioned relative to Zigbee or Thread devices.
The device can operate as a Zigbee 3.0 coordinator, Zigbee router, or Matter-over-Thread border router / Thread adapter, with modes easily switchable using the manufacturer’s firmware. With PoE power supply, an external antenna, +20 dB signal amplification, and the open-source-oriented SLZB-OS firmware, it offers exceptional flexibility for use with Home Assistant, Zigbee2MQTT, ZHA, openHAB, HomeSeer, and other advanced systems. It is typically recommended for DIY-savvy users building reliable and scalable infrastructures, but beginners can also create a stable smart home platform with it.
The SLZB-MR2U operates primarily as a Plug & Play device, as it comes pre-configured, while still offering advanced configuration options. It can be managed via a web interface, supports remote firmware updates, and provides secure login access. For users seeking a more stable Zigbee or Thread network with better radio positioning and flexible connectivity, this is a powerful premium solution. Advanced users can also run ESPHome firmware, enabling further customization in DIY environments.
The device includes advanced networking and system features such as WireGuard VPN, DDNS, OTA updates, and secure password-protected web access. Firmware—including the radio chips (CC2652P and EFR32MG21) and the SLZB-OS system—can be updated remotely without physical access.
The SLZB-MR2U is built on powerful hardware: Zigbee and Thread communication is handled by the CC2652P and EFR32MG21 radio chips, while all control and networking functions are managed by a dual-core ESP32-S3 (240 MHz). Stable Ethernet connectivity is ensured by the W5500 controller, while the isolated PoE power supply guarantees safe and reliable operation.
The device also supports USB passthrough, allowing USB devices (e.g., USB–UART adapters) to be accessed over the network, and can also provide power to them when using PoE.
About the SMLIGHT Brand
SMLIGHT develops Zigbee and Thread network adapters primarily for advanced smart home users, especially popular in Home Assistant environments. The brand focuses on strong radio performance, flexible placement, PoE capability, and compatibility with systems such as ZHA, Zigbee2MQTT, openHAB, and HomeSeer. SMLIGHT devices typically fit into open, DIY-oriented ecosystems with strong community support.
Main Product Features
- Zigbee and Matter-over-Thread support – Pre-configured for quick setup in Zigbee or Thread environments.
- Flexible connectivity – Can be used via Ethernet, Wi-Fi, or USB.
- PoE power supply – Can operate via PoE, eliminating the need for a separate power cable.
- Home Assistant compatibility – Works seamlessly with ZHA, Zigbee2MQTT, and other platforms.
- Strong radio performance – +20 dB amplifier and +5 dBi antenna for improved coverage.
- Multiple modes – Switch between Zigbee coordinator, Zigbee router, or Thread mode.
- Web interface – Settings and mode switching available via browser.
- Remote updates – Firmware can be updated remotely.
Smart Home Protocols and Platform Compatibility
- Supported protocols – Zigbee 3.0 and Matter-over-Thread.
- Multi-protocol usage – Supports both Zigbee and Thread depending on the selected mode.
- Network connectivity – Integration via Ethernet, Wi-Fi, or USB.
- Platform – Proprietary SLZB-OS with web-based interface.
- Home Assistant – Supported in ZHA and Zigbee2MQTT environments.
- openHAB / HomeSeer – Can be used as a network coordinator.
- Matter / Thread – Suitable for Thread-based infrastructures.
- DIY integration – Well-suited for advanced, community-supported environments.
Smart Features
- Mode switching – Switch between Zigbee coordinator, Zigbee router, or Thread mode.
- Remote management – Accessible via web interface.
- Remote firmware updates – ESP32 firmware can be updated remotely.
- Auto-discovery – Supported in Home Assistant environments.
- Secure access – Settings protected with username/password authentication.
- Flexible installation – Can be mounted on a wall, under a desk, or in discreet locations.
- Physical control button – Certain functions controllable via hardware button.
- Developer-friendly design – DIY pinouts available for ESP32 and CC2652P access.
Technical Specifications
- Product name: SMLIGHT SLZB-MR2
- Product type: Zigbee / Thread PoE Ethernet / Wi-Fi / USB adapter
- Radio chip 1: Texas Instruments CC2652P
- Radio chip 2: Silicon Labs EFR32MG21
- Main controller: ESP32, dual-core, 240 MHz
- Ethernet chip: W5500 (WIZnet)
- Supported modes: Zigbee Coordinator (ZHA/Zigbee2MQTT), Zigbee Router, Matter-over-Thread Router
- Simultaneous Zigbee + Thread operation: Yes
- Standalone Zigbee hub: Yes
- Connectivity: Ethernet / Wi-Fi / USB
- Ethernet: 10/100 Mbps
- Wi-Fi: 2.4 GHz
- Bluetooth: Yes
- Power supply: USB Type-C or PoE
- PoE standard: IEEE 802.3af (48V)
- PoE transformer: SMLIGHT 5V
- Simultaneous Type-C and PoE: Yes
- Overvoltage protection: Yes
- Optoelectronic isolation: Yes
- Power consumption: 1–1.5 W
- Zigbee antenna: External +5 dB (L/I-shaped)
- Thread antenna: External +5 dB (L/I-shaped)
- Wi-Fi / Bluetooth antenna: Internal (PCB), +2 dB
- Radio output gain: up to +20 dB
- Firmware: Pre-installed (Plug & Play), SLZB-OS compatible
- ESP32 flasher: Integrated
- Radio SoC flasher: Integrated
- Compatibility: Zigbee2MQTT, ZHA, OTBR, Home Assistant, openHAB, HomeSeer
- OTBR support: Yes
- Status indicators: 6 LEDs
- Control button: Yes
- Dimensions (adapter): 160 × 24 × 28 mm
- Weight (adapter): 86 g
- Antenna dimensions: 192 × 12 × 12 mm
- Package dimensions: 180 × 25 × 40 mm
- Operating temperature: +5 °C to +35 °C
- Operating humidity: < 60%
