Install a USB-to-UART Bridge Virtual COM Port driver

In order to be able to communicate with your USB device over a virtual COM port, you might need a driver for your OS in order for it to be able to be found by your flashing software.

Determine which COM port is assigned to your device

  1. Connect your sniffer device
  2. Open up Start menu and start typing Device Manager
  3. Expand Ports (COM & LPT)
  4. Look for a node similar to USB Serial Device (COM4)
  5. Take note of the port number, it will be needed during configuration

Device Manager


  1. Download and install Node.js 20 LTS from their websiteopen in new window
  2. Open up a Command prompt or Powershell from the Start menu (Powershell has prettier colors)
  3. Verify Node.js was successfully installed
    node --version
  4. Choose a suitable directory for Zigbee2MQTT and copy all the files from the Zigbee2MQTT repositoryopen in new window
    • if you prefer to use git (which you should), just clone the whole repository
      git clone --depth 1
    • otherwise use the green Clone or download button to download the zip archive, then extract it
  5. Change to the newly created directory and install dependencies with Node.js own package manager npm
    npm ci


  1. Copy data\configuration.example.yaml to data\configuration.yaml
  2. Open data\configuration.yaml in a text editor
  3. Change the serial port configuration to match your setup
        port: \\.\COM4
  4. Make sure other settings are correct as well
  5. Save and exit

Congratulations, you're now ready to start your Zigbee2MQTT installation

Starting Zigbee2MQTT

Just change to the root directory of your installation and run the application:

npm start

A successful setup produces an output similar to this:

> zigbee2mqtt@1.6.0 start C:\Users\me\Documents\GitHub\zigbee2mqtt
> node index.js

  Zigbee2MQTT:info 2019-10-18 10:56:22 PM Logging to directory: 'D:\Documents\GitHub\zigbee2mqtt\data\log\2019-10-18.22-56-22'
  Zigbee2MQTT:info 2019-10-18 10:56:22 PM Starting Zigbee2MQTT version 1.6.0 (commit #e26ad2a)
  Zigbee2MQTT:info 2019-10-18 10:56:22 PM Starting zigbee-shepherd
  Zigbee2MQTT:info 2019-10-18 10:56:24 PM zigbee-shepherd started
  Zigbee2MQTT:info 2019-10-18 10:56:24 PM Coordinator firmware version: '20190608'

The Coordinator firmware version: '20190608' entry means that Zigbee2MQTT has successfully communicated with the USB sniffer.

Zigbee2MQTT can be stopped anytime by pressing CTRL + C and then confirming with Y.

Updating Zigbee2MQTT

It is recommended to back up the Zigbee2MQTT \data subdirectory before performing any modifications.

  1. First, stop Zigbee2MQTT
  2. Navigate to the directory where the Zigbee2MQTT repository was cloned to in the Installing step
  3. Pull the latest content from the configured source
    git pull
  4. Update NPM dependencies
    npm ci
  5. Restart Zigbee2MQTT
    npm start

Below is a sample PowerShell script to run which will take care of:

  • Backing up the data directory
  • Updating Zigbee2MQTT
  • Restoring the data directory contents

The script will automatically check if node is running (in case Zigbee2MQTT is still running) and ask to close if it is. You will need to manually stop and restart it afterwards.

Ensure you update the relevant paths in the script to match your environment. By default, the script will target D:\ProgramData\zigbee2mqtt\ as the install folder and C:\Temp\ as the folder where to temporarily store the data folder backup

Run script from an elevated administrative PowerShell console

# Z2M must not be running
# This script will NOT re-start it

# Modify below paths as necessary
$z2mPath = "D:\ProgramData\zigbee2mqtt"
$backupPath = "C:\Temp"

# DO NOT MODIFY below this line
# ------------------------------------------------------------------------------
# Build paths
$z2mDataPath = Join-Path -Path $z2mPath -ChildPath 'data'
$z2mBackupPath = Join-Path -Path $backupPath -ChildPath 'z2mdata'

# Check if Z2M is running
if (Get-Process -Name "node" -ErrorAction SilentlyContinue) {
    # Found running instance of node, stop script
    "Node still running, please close first" | Write-Host -ForegroundColor Red
else {    
    # Continue!
    "Node not running, Zigbee2MQTT upgrade will continue" | Write-Host -ForegroundColor Green
# Change working directory to:
"Setting location to ""$($z2mPath)""" | Write-Host
Set-Location -Path $z2mPath
# Back up data directory:
"Backing up data subdirectory" | Write-Host
Copy-Item -Path $z2mDataPath -Destination $z2mBackupPath -Recurse
# Pull the latest release:
"Running ""git pull""" | Write-Host
& git pull
# Update NPM dependencies:
"Running ""npm ci""" | Write-Host
& npm ci
# Restore backed-up data:
"Restore backed up data directory" | Write-Host
Copy-Item -Path "$($z2mBackupPath)\*" -Destination $z2mDataPath -Recurse -Force
# Delete back up folder:
"Delete backed up folder" | Write-Host
Remove-Item -Path $z2mBackupPath -Recurse
"Update completed!" | Write-Host -ForegroundColor Green