SmartThings Homebridge Plugin with OAuth Support

A modern SmartThings plugin for Homebridge that provides seamless integration with your SmartThings devices. This plugin features automatic device discovery, OAuth authentication, and access token refresh capabilities.

✨ Features

• No Legacy App Required: Works with the new SmartThings app and API
• Automatic Device Discovery: Automatically finds and adds your SmartThings devices
• Device Management: Automatically removes devices that are no longer in your SmartThings network
• OAuth Support: Secure authentication with automatic token refresh
• Easy Setup: Simplified installation and configuration process

📋 Prerequisites

Before you begin, ensure you have the following installed and configured:

• Homebridge: A working Homebridge installation
• SmartThings CLI: Download and install the official SmartThings CLI tool
• Tunneling Service: One of the following:
  • ngrok (free tier available)
  • Cloudflare Zero Trust Tunnels (free)
  • Any other secure tunnel service

🚀 Installation Guide

Step 1: Set Up Secure Tunnel

You need a secure tunnel to expose your local Homebridge server to the internet for SmartThings OAuth callbacks.

Option A: Using ngrok (Recommended for beginners)

1. Sign up and get your domain:

   • Create a free account at ngrok.com
   • Go to your ngrok dashboard and note your free domain (e.g., your-domain.ngrok-free.app)

2. Start the tunnel:

   ngrok http --url=your-domain.ngrok-free.app 3000

   Important: Replace your-domain.ngrok-free.app with your actual ngrok domain. Keep port 3000 as shown.

Option B: Using Cloudflare Zero Trust Tunnels (Free alternative)

Follow the Cloudflare tunnel setup guide to create a tunnel pointing to localhost:3000.

Step 2: Create SmartThings App

⚠️ Important: You must create the SmartThings app FIRST to get the Client ID and Secret needed for plugin configuration.

1. Run the app creation command:

   smartthings apps:create

2. Follow the prompts carefully:

   Prompt	Your Answer	Example
   App Type	OAuth-In App	OAuth-In App
   Display Name	Choose a descriptive name	Homebridge SmartThings
   Description	Brief description	Homebridge integration for SmartThings devices
   Icon Image URL	Leave blank	(press Enter)
   Target URL	Your tunnel URL	https://your-domain.ngrok-free.app
   Scopes	Required permissions	r:devices:*, x:devices:*, r:locations:*
   🔴 Redirect URI	CRITICAL: Your callback URL	https://your-domain.ngrok-free.app/oauth/callback

   🚨 CRITICAL: The Redirect URI must be exactly https://your-domain.ngrok-free.app/oauth/callback (including /oauth/callback). This is essential for OAuth to work properly!

3. Save your credentials immediately:

   After creation, you'll see output like this:

   OAuth Info (you will not be able to see the OAuth info again so please save it now!):
   ───────────────────────────────────────────────────────────
    OAuth Client Id      7a850484-xxxx-xxxx-xxxx-xxxxxxxxxxxx 
    OAuth Client Secret  3581f317-xxxx-xxxx-xxxx-xxxxxxxxxxxx 
   ───────────────────────────────────────────────────────────
   

   ⚠️ Critical: Copy and save both the Client ID and Client Secret immediately. You cannot retrieve them later!

Step 3: Install the Plugin

Now that you have your SmartThings app credentials, you can install and configure the plugin.

1. Install via Homebridge UI:
   • Open your Homebridge web interface
   • Go to the "Plugins" tab
   • Search for Homebridge Smartthings oAuth Plugin
   • Click "Install"

Step 4: Configure the Plugin

1. Open Homebridge Configuration:

   • Go to your Homebridge web interface
   • Navigate to "Plugins" tab
   • Find "SmartThings OAuth Plugin" and click "Settings"

2. Enter your configuration (using credentials from Step 2):

   Field	Value	Notes
   Target URL	https://your-domain.ngrok-free.app	Your tunnel URL (without /oauth/callback)
   Client ID	Your OAuth Client ID	From Step 2
   Client Secret	Your OAuth Client Secret	From Step 2

   📝 Note: The plugin automatically appends /oauth/callback to your Target URL, so don't include it.

3. Save the configuration.

Step 5: Authorize the Plugin

1. Restart Homebridge to apply the configuration.

2. Check the logs for an authorization URL:

   [SmartThings OAuth] Visit this URL to authorize the plugin:
   https://your-domain.ngrok-free.app/authorize?client_id=...
   

3. Authorize the plugin:

   • Copy the complete authorization URL from the logs
   • Paste it into your web browser
   • Log in to your SmartThings account
   • Grant the requested permissions
   • You should see a success message

4. Final restart: Restart Homebridge one more time to complete the setup.

🎉 You're Done!

Your SmartThings devices should now appear in HomeKit! The plugin will automatically:

• Discover all compatible devices
• Add them to HomeKit
• Remove devices that are no longer available
• Refresh access tokens as needed

🔧 Troubleshooting

Common Issues

Plugin not finding devices:

• Verify your SmartThings app has the correct scopes: r:devices:*, x:devices:*, r:locations:*
• Check that your tunnel is still running
• Ensure you completed the authorization step

Authorization fails:

• Make sure you copied the complete authorization URL
• Verify your tunnel URL is accessible from the internet
• Check that your Client ID and Secret are correct

Devices not responding:

• Restart Homebridge
• Check that devices are online in the SmartThings app
• Verify the plugin has the necessary permissions

Getting Help

If you encounter issues:

1. Check the Homebridge logs for detailed error messages
2. Ensure all URLs and credentials are correct
3. Verify your tunnel service is running properly

📄 Changelog

See CHANGELOG.md for version history and detailed release notes.

📄 Credits

This is a fork of the original homebridge-smartthings plugin created by @iklein99, enhanced with OAuth support and automatic token refresh capabilities.