AI for IoT: MQTT Pub/Sub
/** Enable OpenClaw to listen to thousands of sensory data streams and flip physical switches in the real world using the lightweight MQTT protocol. */
Sentient Logic for Hardware
Instead of writing fragile, hardcoded rules in Node-RED or Home Assistant, OpenClaw provides a direct Bridge to your MQTT broker. By pushing high-frequency telemetry states to the LLM and granting publish rights, it becomes a sentient logic engine. It doesn't just 'run a script'; it infers intent based on sensor context—like dimming lights when a lux sensor drops and a person is detected, without explicit IF/THEN blocks.
1. Broker Setup (Mosquitto/EMQX)
We assume you have a broker running locally. For optimal performance, ensure your broker is accessible on the same VPC or subnet as OpenClaw.
2. The MCP-to-MQTT Bridge
OpenClaw uses a universal bridge that translates MQTT messages into MCP resources. You don't need to write Python boilerplate; just declare your broker credentials in your configuration.
3. IoT Workflow: Sense & Act
Broadcasting your entire sensor tree can overwhelm context windows. We recommend using specific 'Exposed Topics' to keep the agent focused on relevant telemetry.
[1]mqtt_subscribe(topic): Read real-time payloads from any subscribed path.[2]mqtt_publish(topic, payload): Execute physical actions by sending commands to actuators.
4. Practical Automation Examples
- ⫸"Check the living room CO2 levels on home/sensors/air/co2."
- ⫸"Is the garden soil moisture below 20% on home/garden/soil/1?"
- ⫸"Open the window if CO2 > 1000ppm by publishing 'OPEN' to home/actuators/window/cmd."
- ⫸"Trigger the irrigation system on home/garden/pump/set."
🛡️ Safety & Edge Intelligence
CRITICAL: Language models can hallucinate. Never grant mqtt_publish access to life-critical infrastructure or high-heat appliances without physical, hard-wired failsafes. Use specific Topic ACLs (Access Control Lists) in your Mosquitto configuration to restrict OpenClaw's reach to non-critical devices.