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MQTT

by nagarjunrversion 0.1.0i★ –iRuns on your computer
Registry nameio.github.nagarjunr/mqtt

Install

Overview

Description from the maker (original English)

MCP server for MQTT 5.0 brokers (publish, subscribe, topic discovery).

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs on your computer
  • Transport: stdio
  • Category: Other
  • You need to fill in: MQTT_HOST, MQTT_PASSWORD

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 1 of 1 passed
  • Runs on your computer with your user’s permissions (files, network, apps).
  • You fill in yourself: MQTT_HOST, MQTT_PORT, MQTT_USERNAME, MQTT_PASSWORD, MQTT_USE_TLS

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

  • PyPIPython’s uv installed (for the uvx command)

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "mqtt": {
      "command": "uvx",
      "args": [
        "mqtt5-mcp-server"
      ],
      "env": {
        "MQTT_HOST": "your-value",
        "MQTT_PORT": "your-value",
        "MQTT_USERNAME": "your-value",
        "MQTT_PASSWORD": "your-value",
        "MQTT_USE_TLS": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add mqtt --env MQTT_HOST=your-value --env MQTT_PORT=your-value --env MQTT_USERNAME=your-value --env MQTT_PASSWORD=your-value --env MQTT_USE_TLS=your-value -- uvx mqtt5-mcp-server

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "mqtt": {
      "command": "uvx",
      "args": [
        "mqtt5-mcp-server"
      ],
      "env": {
        "MQTT_HOST": "your-value",
        "MQTT_PORT": "your-value",
        "MQTT_USERNAME": "your-value",
        "MQTT_PASSWORD": "your-value",
        "MQTT_USE_TLS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "mqtt": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mqtt5-mcp-server"
      ],
      "env": {
        "MQTT_HOST": "your-value",
        "MQTT_PORT": "your-value",
        "MQTT_USERNAME": "your-value",
        "MQTT_PASSWORD": "your-value",
        "MQTT_USE_TLS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

  • MQTT_HOST required env
    Broker hostname or IP
  • MQTT_PORT env
    Broker port, default 1883 (or 8883 for TLS)
  • MQTT_USERNAME env
    Broker username
  • MQTT_PASSWORD secret env
    Broker password
  • MQTT_USE_TLS env
    true/false, default false

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account nagarjunr, which owns the repo

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • – Not applicable

    Endpoint responds

    This one runs on your computer; there is no internet endpoint

  • – Not applicable

    Sign-in with OAuth

    Runs on your computer and uses local settings instead

  • … Not checked yet

    No hidden instructions in tool descriptions

    Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

  • More stars than 0% of the other 32509 servers in this category
  • Published to the registry more recently than 19% of the other 32509 servers in this category
  • Basic checks equal to or better than 100% of the other 32509 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MQTT safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: MQTT_HOST, MQTT_PASSWORD

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Fomu MCP

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

MQTT MCP Server

A Model Context Protocol (MCP) server for MQTT — the standard IoT publish/subscribe messaging protocol. Works against any MQTT broker (Eclipse Mosquitto, EMQX, HiveMQ, AWS IoT Core, Azure IoT Hub's MQTT endpoint, etc): only the standard MQTT 5.0 wire protocol is used, no broker-specific admin APIs.

Built with FastMCP and paho-mqtt.

Tools

ToolDescription
get_connection_status()Report this connector's broker connection state.
publish_message(topic, payload, qos, retain, ...)Publish a message. Supports MQTT5 properties (content type, message expiry, response topic, correlation data, user properties) and optionally blocks until the broker acknowledges delivery (QoS 1/2).
start_subscription(topic_filter, qos, ...)Start receiving messages matching a topic filter (supports +/# wildcards). Returns a session_id.
get_messages(session_id, max_messages, timeout_seconds)Drain buffered messages from a subscription session; can wait briefly for one to arrive.
stop_subscription(session_id)Stop a session and unsubscribe (if no other session needs the same filter).
list_subscriptions()List all active subscription sessions.
discover_topics(topic_filter, duration_seconds, max_topics)Approximate a "list topics" operation via retained messages — MQTT has no native topic-listing operation.
Why subscriptions are session-based

MQTT is a continuous publish/subscribe stream, not a request/response API. A single MCP tool call can't "wait forever" for messages, so subscribing works in two steps: start_subscription registers interest and buffers messages in the background (one shared broker connection, dispatched in-process by topic filter), then get_messages drains that buffer on however many tool calls you want, optionally waiting a bounded amount of time for new data. Call stop_subscription when done.

Configuration

Env varRequiredDescription
MQTT_HOSTYesBroker hostname or IP.
MQTT_PORTNoDefault 1883 (or 8883 for TLS — set explicitly).
MQTT_USERNAME / MQTT_PASSWORDNoBroker credentials.
MQTT_CLIENT_IDNoDefaults to a broker-assigned ID.
MQTT_KEEPALIVENoSeconds, default 60.
MQTT_CONNECT_TIMEOUTNoSeconds to wait for the initial connect, default 10.
MQTT_TRANSPORTNotcp (default) or websockets.
MQTT_WS_PATHNoPath for the websocket transport, default /mqtt.
MQTT_USE_TLSNotrue/false, default false.
MQTT_TLS_CA_CERTSNoPath to a CA bundle. Omit to use the system trust store.
MQTT_TLS_CLIENT_CERT / MQTT_TLS_CLIENT_KEYNoFor mutual TLS.
MQTT_TLS_INSECURENoSkip hostname verification — for self-signed test certs only.
MQTT_WILL_TOPIC / MQTT_WILL_PAYLOAD / MQTT_WILL_QOS / MQTT_WILL_RETAINNoLast Will and Testament, set once at connect time.

Running locally

uv sync

export MQTT_HOST=localhost export MQTT_PORT=1883 export MQTT_USERNAME=mqtt export MQTT_PASSWORD=mqtt uv run mqttmcpserver.py

See mcp.json for ready-to-use client configs (stdio and Docker).

Testing against a real broker

This repo's design principles call for testing against a real instance rather than mocks. docker-compose.yml spins up Eclipse Mosquitto (2.x, MQTT5-capable) with password auth, plus a TLS listener with self-signed certs for testing the TLS/mTLS code paths.

./docker/gen-test-certs.sh # one-time: generate throwaway TLS test certs (needs openssl)

docker compose up -d # start Mosquitto on localhost:1883 (plain, user: mqtt / pass: mqtt) and :8883 (TLS) uv run pytest -v # tests/conftest.py also starts/stops the stack automatically docker compose down # stop it manually if you started it yourself

License notes

docker-compose.yml and the files under docker/ configure the open-source Eclipse Mosquitto broker (EPL-2.0) for local testing only — they are not part of the MCP server itself.

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