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Documentation

Everything you need to build on MQTT and Sparkplug

Installation guides, configuration references, and release notes for Chariot, the Cirrus Link modules for Ignition, and IoT Bridges — versioned so the docs match what you actually have deployed.

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Products

Pick your product and version

Each product keeps its own documentation set. Choose the version that matches your deployment — older releases stay available.

MQTT Server & Client

Chariot

An MQTT broker built for industrial environments. Supports MQTT 3.1.1 and Sparkplug for structured, state-aware communication between edge devices, SCADA systems, and enterprise applications.

v3.0.0v2.7.0 – v2.8.1≤ v2.6.0

For Ignition

Cirrus Link Modules

MQTT Transmission, Engine, Distributor, and Recorder — the modules that connect Ignition gateways to any MQTT infrastructure, plus cloud injectors and device drivers.

v8.3.xv8.1.x

Cloud connectivity

IoT Bridges

Move Sparkplug data from the plant floor into AWS, Azure, and Snowflake without writing custom integration code.

Documentation

New to MQTT and Sparkplug?

Cirrus Link's team includes the co-inventor of MQTT and the original architects of Sparkplug. Start with the terminology and the concepts behind report-by-exception, self-discovery, and state-aware messaging before you configure anything.

Read more about Cirrus Link Solutions

Resources

Everything else

FAQAnswers to the questions we get asked most often.License AgreementsSoftware Module License Agreements (SMLAs).Contact SupportTalk to the Cirrus Link support team.