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6. Radios & Protocols

SMHUB integrates multiple radios to support a broad range of smart home and IoT protocols, making it a true multi-radio coordinator and Matter bridge.

6.1 Zigbee

  • Chipset: TI CC26xx series.

  • Port: /dev/ttyS1
  • Baudrate: 115200
  • RTS/CTS: false

  • Protocol: Zigbee 3.0 and legacy devices.

  • Software: Zigbee2MQTT (Z2M).

  • Integration:

    • Pairs and manages Zigbee devices directly.

    • Publishes states/events via the preinstalled Mosquitto MQTT broker.

    • Compatible with Home Assistant, OpenHAB, Node-RED, and other MQTT platforms.

  • Coordinator Mode: Can operate as a standalone Zigbee coordinator, without additional servers.

6.2 Thread

  • Chipset: Silicon Labs EFR32MG series.

  • Port: /dev/ttyS2
  • Baudrate: 115200
  • RTS/CTS: false

  • Protocol: Thread 1.1/1.2.

  • Integration:

    • Acts as an OpenThread Border Router (OTBR).

    • Works with Matterbridge, exposing Thread/Zigbee devices into Matter.

  • Use Cases:

    • Bridging Zigbee sensors to Matter.

    • Running mixed Zigbee + Thread networks.

6.3 Z-Wave

  • Radio Module: EFR32ZG23 expansion module.

  • Port: /dev/ttyS3
  • Baudrate: 115200
  • RTS/CTS: false

  • Protocol: Z-Wave 700/800 series, including Z-Wave Long Range (LR).

  • Software: Managed via Z-Wave JS (installable).

  • Integration:

    • Local Z-Wave or Z-Wave LR networks.

    • Automation via Node-RED and MQTT.

  • Hardware: Dedicated LED and reset/flash pins for diagnostics and firmware updates.

6.4 4G/LTE (in development)

  • Module: SIM7672G LTE modem.

  • Port: /dev/ttyS4
  • Baudrate: 115200
  • RTS/CTS: false

  • Capabilities:

    • LTE Cat 1 connectivity.

    • Interfaces: USB, debug UART.

    • Antenna connectors for LTE and GNSS.

    • SIM slot with SIM detection.

  • Status: Hardware fully integrated, software support is in active development.

  • Planned Functions:

    • LTE fallback connectivity.

    • Remote site deployments without Ethernet/Wi-Fi.

6.5 Wi-Fi

  • Bands: Dual-band 2.4 GHz and 5 GHz.

  • Modes: Access Point (AP) and Client.

  • Use Cases:

    • 2.4 GHz: long range, high compatibility.

    • 5 GHz: higher bandwidth, reduced interference.

  • Integration: Used for device connectivity and as a network backbone when Ethernet is not available.

6.6 Bluetooth

  • Version: Bluetooth 5.0.

  • Support: Bluetooth Low Energy (BLE).

6.7 Multi-Radio Operation

  • Zigbee + Thread + Wi-Fi + Bluetooth operate simultaneously out of the box.

  • Z-Wave and 4G/LTE are available via expansion modules.

  • Hardware and firmware are designed to minimize interference and ensure stable concurrent radio operations.

6.8 Matter Bridge

SMHUB can function as a Matter bridge, allowing non-Matter devices to join modern ecosystems:

  • Bridges Zigbee and Thread devices into Matter.

  • Compatible with Google Home, Apple Home, Amazon Alexa, SmartThings.

  • Entirely local bridging — no third-party cloud services required.

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