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9. Troubleshooting

This section lists common issues that may occur during the installation or operation of SMHUB and their solutions.

9.1 Power & Boot

The first batch of SMHUBs with 4G add-ons did not include the screw with a ring, which was meant to be placed between the add-on and the main PCB.
screw-4g-addon.jpg
For some users, this caused a short circuit that prevented the hub from turning on.
To fix this, follow the steps below: 

  1. Remove the 4G add-on
  2. Stick insulating tape to the SIM card slot or place a layer of paper between the PCB and the 4G add-on

    sticker-sim-card-addon.jpg

  3. Install the 4G add-on

This section lists common issues that may occur during the installation or operation of SMHUB and their solutions.

9.2 Feedbacks from users

  • Issue: ... nothing on the webUI is loading. the Settings page stays completely blank, doesn't matter which setting I choose. 
    Resolution: And I have to admit, the problem was not the hub, it was me - Firefox & AdBlock will break the UI, at least in my case. 

9.1 Power & Boot

Issue: Device does not power on.

  • ✅ Check USB-C power supply (must be 5V / 2A).

  • ✅ If using PoE, verify switch/injector supports 802.3af.

  • ✅ If using UPS module, check 18650 cells are correctly installed and charged.

Issue: Device powers on but LEDs remain off.

  • ✅ Press the reset button once.

  • ✅ If still unresponsive, hold reset for 10 seconds to trigger factory reset.

9.2 Network

Issue: Cannot access http://smhub.local.

  • ✅ Check Ethernet cable or Wi-Fi connection.

  • ✅ Use ipscanner or router admin page to find SMHUB’s IP address.

  • ✅ Try direct connection over USB-C (Ethernet-over-USB).

Issue: Wi-Fi AP not visible.

  • ✅ Check if Wi-Fi mode is enabled in Settings → Network.

  • ✅ Ensure your device supports 2.4 GHz (some IoT devices are limited to 2.4 GHz).

Issue: VPN (WireGuard) does not connect.

  • ✅ Verify correct keys and configuration.

  • ✅ Check firewall settings on the remote side.

9.3 Radios

Issue: Zigbee devices not pairing.

  • ✅ Make sure Zigbee radio is enabled in Settings → Radios.

  • ✅ Open Zigbee2MQTT frontend and enable pairing mode.

  • ✅ Reset the Zigbee device before re-pairing.

Issue: Thread/Matter devices not visible.

  • ✅ Verify Thread radio is enabled and OTBR service is running.

  • ✅ Check Matterbridge configuration.

  • ✅ Ensure controller (Google Home / Apple HomeKit) is on the same LAN.

Issue: Z-Wave devices not discovered.

  • ✅ Confirm Z-Wave module is installed and detected in Settings → Radios.

  • ✅ Check Z-Wave JS app is installed and running.

Issue: 4G/LTE not working.

  • ✅ Insert SIM card with data plan.

  • ✅ Check antenna connections.

  • ✅ LTE support is in development — update to the latest firmware for support

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