Sparkplug B

Name: Sparkplug B
Author: nagarjunr

by nagarjunrversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.nagarjunr/sparkplug-b

Install

Overview

Description from the maker (original English)

MCP server for Sparkplug B: node/device discovery, metrics, commands, host state over MQTT.

PopNx MCP’s three pillars

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

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

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: SPARKPLUG_MQTT_HOST, SPARKPLUG_HOST_ID, SPARKPLUG_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: SPARKPLUG_MQTT_HOST, SPARKPLUG_HOST_ID, SPARKPLUG_MQTT_PORT, SPARKPLUG_MQTT_USERNAME, SPARKPLUG_MQTT_PASSWORD, SPARKPLUG_MQTT_USE_TLS, SPARKPLUG_GROUP_ID

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?

ClaudeClaude CodeCursorVS CodeChatGPT

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": {
    "sparkplug-b": {
      "command": "uvx",
      "args": [
        "sparkplug-b-mcp-server"
      ],
      "env": {
        "SPARKPLUG_MQTT_HOST": "your-value",
        "SPARKPLUG_HOST_ID": "your-value",
        "SPARKPLUG_MQTT_PORT": "your-value",
        "SPARKPLUG_MQTT_USERNAME": "your-value",
        "SPARKPLUG_MQTT_PASSWORD": "your-value",
        "SPARKPLUG_MQTT_USE_TLS": "your-value",
        "SPARKPLUG_GROUP_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add sparkplug-b --env SPARKPLUG_MQTT_HOST=your-value --env SPARKPLUG_HOST_ID=your-value --env SPARKPLUG_MQTT_PORT=your-value --env SPARKPLUG_MQTT_USERNAME=your-value --env SPARKPLUG_MQTT_PASSWORD=your-value --env SPARKPLUG_MQTT_USE_TLS=your-value --env SPARKPLUG_GROUP_ID=your-value -- uvx sparkplug-b-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": {
    "sparkplug-b": {
      "command": "uvx",
      "args": [
        "sparkplug-b-mcp-server"
      ],
      "env": {
        "SPARKPLUG_MQTT_HOST": "your-value",
        "SPARKPLUG_HOST_ID": "your-value",
        "SPARKPLUG_MQTT_PORT": "your-value",
        "SPARKPLUG_MQTT_USERNAME": "your-value",
        "SPARKPLUG_MQTT_PASSWORD": "your-value",
        "SPARKPLUG_MQTT_USE_TLS": "your-value",
        "SPARKPLUG_GROUP_ID": "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": {
    "sparkplug-b": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "sparkplug-b-mcp-server"
      ],
      "env": {
        "SPARKPLUG_MQTT_HOST": "your-value",
        "SPARKPLUG_HOST_ID": "your-value",
        "SPARKPLUG_MQTT_PORT": "your-value",
        "SPARKPLUG_MQTT_USERNAME": "your-value",
        "SPARKPLUG_MQTT_PASSWORD": "your-value",
        "SPARKPLUG_MQTT_USE_TLS": "your-value",
        "SPARKPLUG_GROUP_ID": "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

SPARKPLUG_MQTT_HOST required env
MQTT broker hostname or IP.
SPARKPLUG_HOST_ID required env
This connector's Sparkplug Host Application ID (used in the spBv1.0/STATE/{id} topic).
SPARKPLUG_MQTT_PORT env
MQTT broker port, default 1883
SPARKPLUG_MQTT_USERNAME env
Broker username, if required
SPARKPLUG_MQTT_PASSWORD secret env
Broker password, if required
SPARKPLUG_MQTT_USE_TLS env
true/false, default false
SPARKPLUG_GROUP_ID env
Restrict discovery/watching to a single Sparkplug Group ID; omit to subscribe to every group

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 21% 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 Sparkplug B 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: SPARKPLUG_MQTT_HOST, SPARKPLUG_HOST_ID, SPARKPLUG_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.

Sparkplug B MCP Server

A Model Context Protocol (MCP) server for Sparkplug B — the Eclipse-standard MQTT topic/payload convention for industrial/SCADA data (birth/death certificates, sequenced metrics, protobuf payloads). Works against any MQTT broker that carries Sparkplug B traffic; only the open Sparkplug B specification is used, no vendor-specific extensions.

This server acts as a Sparkplug B Primary Host Application: it subscribes to the entire spBv1.0 namespace, discovers Edge Nodes and Devices from their NBIRTH/DBIRTH messages, tracks their live metrics, and can send them commands (NCMD/DCMD) — the same role a SCADA/historian host application plays in a real deployment.

Built with FastMCP and pysparkplug (itself built on paho-mqtt).

Tools

Tool	Description
`get_connection_status()`	Report the broker connection and this host application's identity.
`set_host_online(online)`	Publish this connector's own retained Sparkplug `STATE` message.
`list_edge_nodes(group_id?)`	List Edge Nodes discovered via `NBIRTH`/`NDEATH`.
`list_devices(group_id?, edge_node_id?)`	List Devices discovered via `DBIRTH`/`DDEATH`.
`get_node_metrics(group_id, edge_node_id)`	Latest known metric values for an Edge Node.
`get_device_metrics(group_id, edge_node_id, device_id)`	Latest known metric values for a Device.
`send_node_command(group_id, edge_node_id, metrics)`	Send an `NCMD` — write one or more of a node's metrics.
`send_device_command(group_id, edge_node_id, device_id, metrics)`	Send a `DCMD` — write one or more of a device's metrics.
`request_node_rebirth(group_id, edge_node_id)`	Standard `Node Control/Rebirth` command — asks a node to republish its full `NBIRTH`.
`start_watch(group_id?, edge_node_id?, device_id?, message_types?)`	Start buffering decoded Sparkplug traffic matching an optional filter. Returns a `session_id`.
`get_events(session_id, max_events, timeout_seconds)`	Drain buffered events from a watch session; can wait briefly for one to arrive.
`stop_watch(session_id)`	Stop a watch session and discard its buffered events.
`list_watches()`	List all active watch sessions.

Why watching is session-based

Like the MQTT wire protocol underneath it, Sparkplug B is a continuous stream, not a request/response API — a single MCP tool call can't "wait forever" for the next birth or data message. start_watch registers an optional filter (group/node/device/message-type) and buffers matching decoded messages in the background (this connector is always subscribed to the whole spBv1.0 namespace, so no extra broker subscription is needed per watch); get_events drains that buffer, optionally waiting a bounded amount of time for new data. Call stop_watch when done.

Supported metric datatypes

INT8/INT16/INT32/INT64, UINT8/UINT16/UINT32/UINT64, FLOAT, DOUBLE, BOOLEAN, STRING, TEXT, UUID, DATETIME, BYTES, FILE, and their *_ARRAY variants. DATASET, TEMPLATE, PROPERTYSET, and PROPERTYSETLIST are part of the Sparkplug B spec but unsupported by the underlying pysparkplug codec, so they're rejected with a clear error rather than silently mishandled.

For send_node_command/send_device_command, value shape depends on datatype: plain int/float/bool/str for scalars, an ISO 8601 string for DATETIME, a base64 string for BYTES/FILE, and a JSON list for *_ARRAY types.

Configuration

Env var	Required	Description
`SPARKPLUG_MQTT_HOST`	Yes	Broker hostname or IP.
`SPARKPLUG_HOST_ID`	Yes	This connector's Sparkplug Host Application ID (used in the `spBv1.0/STATE/{id}` topic).
`SPARKPLUG_MQTT_PORT`	No	Default `1883`.
`SPARKPLUG_MQTT_USERNAME` / `SPARKPLUG_MQTT_PASSWORD`	No	Broker credentials.
`SPARKPLUG_MQTT_CLIENT_ID`	No	Defaults to a broker-assigned ID.
`SPARKPLUG_MQTT_KEEPALIVE`	No	Seconds, default `60`.
`SPARKPLUG_MQTT_CONNECT_TIMEOUT`	No	Seconds to wait for the initial connect, default `10`.
`SPARKPLUG_MQTT_USE_TLS`	No	`true`/`false`, default `false`.
`SPARKPLUG_MQTT_TLS_CA_CERTS`	No	Path to a CA bundle. Omit to use the system trust store.
`SPARKPLUG_MQTT_TLS_CLIENT_CERT` / `SPARKPLUG_MQTT_TLS_CLIENT_KEY`	No	For mutual TLS.
`SPARKPLUG_GROUP_ID`	No	Restrict discovery/watching to a single Sparkplug Group ID. Omit to subscribe to every group (`spBv1.0/#`).

Running locally

uv sync

export SPARKPLUG_MQTT_HOST=localhost export SPARKPLUG_MQTT_PORT=1883 export SPARKPLUG_HOST_ID=my-mcp-host uv run sparkplugbmcpserver.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) with an anonymous listener for local testing. Test fixtures use pysparkplug's own EdgeNode/Device classes to act as real simulated PLCs/devices — publishing genuine NBIRTH/DBIRTH/NDATA/DDATA/NDEATH messages and receiving genuine NCMD/DCMD commands over the wire — so coverage is protocol-level, not hand-rolled mocks. Only the "physical" node/device is simulated, since no free real PLC/edge-node hardware exists to test against; the Sparkplug B protocol handling on both sides is real.

docker compose up -d       # start Mosquitto on localhost:1883 (anonymous, local testing only)

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.

Sparkplug B

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Fomu MCP

README from the maker

Sparkplug B MCP Server

Tools

Why watching is session-based

Supported metric datatypes

Configuration

Running locally

Testing against a real broker

License notes