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MCP server for MQTT 5.0 brokers (publish, subscribe, topic discovery).
About
MCP server for MQTT 5.0 brokers (publish, subscribe, topic discovery).
Security Report
4.2
Use Caution4.2High RiskThe Eclipse Ditto MCP server is well-structured with proper authentication patterns and input validation. However, there are several credential handling concerns: environment variables containing sensitive tokens are read at module load time (allowing logging/interception), credentials are used to build httpx clients that persist across requests, and Bearer tokens are stored in plaintext in client headers without additional protection. The server's permissions (network_http, env_vars) are appropriate for its IoT digital twin integration purpose, but credential management practices should be hardened. Supply chain analysis found 5 known vulnerabilities in dependencies (1 critical, 3 high severity). Package verification found 1 issue (1 critical, 0 high severity).
4 files analyzed · 14 issues found
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What You'll Need
Set these up before or after installing:
Broker hostname or IP
Environment variable: MQTT_HOST
Broker port, default 1883 (or 8883 for TLS)
Environment variable: MQTT_PORT
Broker username
Environment variable: MQTT_USERNAME
Broker passwordRequired
Environment variable: MQTT_PASSWORD
true/false, default false
Environment variable: MQTT_USE_TLS
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-nagarjunr-mqtt": {
"env": {
"MQTT_HOST": "your-mqtt-host-here",
"MQTT_PORT": "your-mqtt-port-here",
"MQTT_USE_TLS": "your-mqtt-use-tls-here",
"MQTT_PASSWORD": "your-mqtt-password-here",
"MQTT_USERNAME": "your-mqtt-username-here"
},
"args": [
"eclipse-ditto-mcp-server"
],
"command": "uvx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
IoT MCP Servers
MCP (Model Context Protocol) servers for IoT platforms — giving AI agents read access to device registries, digital twins, and telemetry.
Structure
Each server is a standalone directory under this repo — its own pyproject.toml, uv.lock, Dockerfile, and mcp.json example config. No shared library layer: every server is independently runnable and dockerizable.
<server-name>/
├── <server-name>mcpserver.py # FastMCP server (single file)
├── pyproject.toml # own dependencies
├── uv.lock
├── Dockerfile
├── mcp.json # example MCP client config
└── README.md # tools, env vars, setup for this server
Servers
| Server | Platform | Status |
|---|---|---|
eclipse-ditto | Eclipse Ditto digital twins (open source; also compatible with Bosch IoT Things and other Ditto-based deployments) | ✅ |
mqtt | MQTT 5.0 — the standard IoT pub/sub protocol (any broker: Mosquitto, EMQX, HiveMQ, AWS IoT Core, etc.) | ✅ |
More planned: Azure IoT Hub.
Running a server locally
cd <server-name>
uv sync
uv run <server-name>mcpserver.py
Using with an MCP client
Each server directory has an mcp.json with a ready-to-use client config example (Claude Desktop / VS Code / any MCP client). Copy the relevant block into your client's config, filling in the environment variables described in that server's README.
Design principles
- Read-only by default, writes explicit. Tools default to read/list operations. Any write tool is called out explicitly in that server's README. Create/replace tools default to create-only (
overwrite=False) using conditional HTTP headers rather than check-then-set, so the safe path is race-free, not just the default. Delete tools, where a server needs them, require an explicitconfirm=True— there is no bulk/cascading delete. - No vendor lock-in. Connectors target the open protocol/API (e.g. Eclipse Ditto's HTTP API), not a single vendor's proprietary extension of it, so they work against any compatible deployment.
- Tested against the real thing. Each server is verified against a real instance of the target platform (usually via Docker), not just mocks.
License
MIT — see LICENSE.
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