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mcp-fritzbox

by ghbalf
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mcp-fritzbox

A Model Context Protocol (MCP) server for interfacing with AVM FRITZ!Box routers (FRITZ!OS 8.20+). Control smart home devices, monitor network status, and administer your router through any MCP-compatible client.

Design Architecture

MCP Client (Claude Desktop, Claude Code, etc.)
  │ stdio or HTTP/SSE
MCP Server (server.ts)
  │ routes tool calls
  ├── SmartHomeClient ──→ REST API (/api/v0/smarthome/)
  ├── TR064Client ──────→ SOAP (TR-064 UPnP)
  └── AuthProvider ─────→ SID login (login_sid.lua) + HTTP Digest

Components

Component

File

Responsibility

AuthProvider

src/auth/auth-provider.ts

MD5 challenge-response SID login, HTTP digest credentials for TR-064, lazy re-auth on session expiry

SmartHomeClient

src/client/smart-home.ts

REST calls to the FRITZ!Box Smart Home API for thermostats and switches

TR064Client

src/client/tr064.ts

SOAP calls for router administration (WAN status, bandwidth, guest WiFi, etc.)

HTTP Client

src/client/http.ts

Shared axios instance with 403 interceptor for automatic SID renewal

MCP Server

src/server.ts

Tool registration and error handling — maps MCP tool calls to client methods

Related MCP server: flamerobin-mcp-server

Tools

Smart Home

Tool

Arguments

Output

list_devices

none

{ smartHomeDevices: [...], networkDevices: [...] } — combined smart home actors and network hosts

set_thermostat

ain: string, temperature: number | "ON" | "OFF"

Updated thermostat state (target temp, current temp, battery)

toggle_switch

ain: string, state: boolean

Updated switch state with current power reading (mW) and total energy (Wh)

get_device_stats

ain: string

Temperature history or energy consumption statistics

Router Administration (TR-064)

Tool

Arguments

Output

get_system_info

none

{ modelName, firmwareVersion, serialNumber }

get_wan_status

none

{ externalIp, connectionStatus, uptime, lastError }

get_bandwidth_stats

none

{ totalBytesSent, totalBytesReceived, maxBitRateUp, maxBitRateDown }

toggle_guest_wifi

enable: boolean

{ enabled, ssid, securityMode }

get_device_log

count?: number

Array of recent system log lines (default: 20)

reconnect_wan

none

{ message: "WAN reconnect initiated..." } — forces new external IP

Setup Guide

1. Create a FRITZ!Box User

  1. Open your FRITZ!Box web UI at http://fritz.box

  2. Navigate to System → FRITZ!Box Users → Add User

  3. Set a username and password

  4. Enable these permissions:

    • Smart Home — required for thermostat/switch control

    • FRITZ!Box Settings — required for TR-064 (WAN status, guest WiFi, etc.)

    • Access from the Internet — only if you need remote access

  5. Click Apply

2. Install

From GitHub:

git clone https://github.com/ghbalf/mcp-fritzbox.git
cd mcp-fritzbox
npm install
npm run build

3. Configure

Set environment variables:

export FRITZBOX_HOST=fritz.box       # default, or use IP: 192.168.178.1
export FRITZBOX_USERNAME=your_user
export FRITZBOX_PASSWORD=your_pass

Or pass CLI flags:

node dist/index.js --host 192.168.178.1 --user admin --pass secret

CLI flags override environment variables.

4. Connect to an MCP Client

Claude Code — add a .mcp.json to your project root:

{
  "mcpServers": {
    "fritzbox": {
      "command": "node",
      "args": ["/path/to/mcp-fritzbox/dist/index.js"],
      "env": {
        "FRITZBOX_HOST": "fritz.box",
        "FRITZBOX_USERNAME": "your_user",
        "FRITZBOX_PASSWORD": "your_pass"
      }
    }
  }
}

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "fritzbox": {
      "command": "node",
      "args": ["/path/to/mcp-fritzbox/dist/index.js"],
      "env": {
        "FRITZBOX_HOST": "fritz.box",
        "FRITZBOX_USERNAME": "your_user",
        "FRITZBOX_PASSWORD": "your_pass"
      }
    }
  }
}

HTTP/SSE mode (for remote clients):

node dist/index.js --http --port 3000
# SSE endpoint: http://localhost:3000/sse
# Message endpoint: http://localhost:3000/messages

5. Verify Connection

FRITZBOX_USERNAME=your_user FRITZBOX_PASSWORD=your_pass npm run test:integration

Development

npm run start:dev    # Run with tsx (no build needed)
npm run build        # Compile TypeScript
npm test             # Run unit tests
npm run test:watch   # Watch mode
npm run test:integration  # Live FRITZ!Box connection test

Troubleshooting

Error

Cause

Fix

AUTH_FAILED (SID all zeros)

Wrong username or password

Verify credentials in FRITZ!Box UI under System → FRITZ!Box Users

CONNECTION_FAILED (ECONNREFUSED)

FRITZ!Box unreachable

Check FRITZBOX_HOST — try IP address 192.168.178.1 instead of fritz.box

CONNECTION_FAILED (ETIMEDOUT)

Network issue or wrong port

Ensure you're on the same LAN; check no firewall blocks port 80/49000

403 Forbidden (persistent)

User lacks permissions

Enable "Smart Home" and "FRITZ!Box Settings" in the user's FRITZ!Box permissions

DEVICE_NOT_FOUND

Invalid AIN

Run list_devices first to find valid Actor Identification Numbers

INVALID_PARAMETER (temperature)

Out of range

Temperature must be 8.0–28.0°C, or "ON" / "OFF" for boost/off mode

SOAP fault on guest WiFi

No guest network configured

Set up a guest network in FRITZ!Box UI first (WiFi → Guest Access)

TR-064 401 Unauthorized

Digest auth rejected

User needs "FRITZ!Box Settings" permission; some models require explicit TR-064 access

License

MIT

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