Home, building and industrial automation with MQTT: Home Assistant, Tasmota, Zigbee2MQTT, smart energy and agriculture projects on ConnectMQ.
Measure whole-house consumption with a smart meter P1 reader or CT clamps, publish it as MQTT JSON with a short Python script, and store and chart it with Telegraf, InfluxDB or any dashboard that speaks MQTT.
Keep chilled and frozen goods within range from depot to delivery. This guide designs a cold chain monitoring system with cellular MQTT gateways, store-and-forward buffering and duration-based excursion alerts.
Read analog and binary objects from BACnet/IP HVAC controllers with BAC0 and publish them to an MQTT broker as clean JSON, with deadbands, retained metadata and safe write-back.
Read live production data from your PV inverter over SunSpec Modbus TCP or a local API, publish power, daily energy and status to MQTT, and make solar data available to every dashboard and automation in the house.
Turn your existing garage door motor into a smart one with an ESP32, a relay that presses the wall button for you, and a reed switch that reports the real door state as a retained MQTT message.
MQTT does not replace BACnet or KNX in a building, it sits above them. This guide shows the architecture, topic design and security choices for a multi-site building automation system with MQTT.
Expose MQTT sensors, switches and lights as HomeKit accessories with Homebridge and the mqttthing plugin, including JSON payloads, TLS credentials and a sensible topic layout.
Publish BMS data such as state of charge, pack voltage, current, cell voltage spread and temperature to an MQTT broker, then add low-battery and imbalance alerts with hysteresis so you hear about problems before the inverter shuts down.
Publish discovery config payloads so your own sensors and switches show up in Home Assistant as a complete device, with availability, unique IDs and clean removal, using a Python device simulator.
Collect power and energy readings from MQTT-capable smart plugs, store them in SQLite with a small Python subscriber, and turn them into daily kWh charts per appliance that survive plug reboots and counter resets.
A clean topic layout makes every smart home automation easier. Learn a room/device/property scheme, how to separate command and state topics, when to retain, and which naming mistakes to avoid.
A practical guide to smart agriculture IoT: which sensors matter, how to connect fields without Wi-Fi, how to structure MQTT topics for a farm, and how to keep the system running through seasons.
Trigger Home Assistant automations from raw MQTT messages, filter them with templates and wildcards, and publish commands back to devices with the mqtt.publish action.
City-scale sensor networks succeed or fail on their messaging layer. Learn how lighting, waste and air quality systems share one MQTT backbone with clean topics, gateways, security and room to grow.
Learn which Tasmota builds include TLS, how SetOption103 and SetOption132 work, and how to connect an ESP32 Tasmota device to an encrypted MQTT broker on port 8883.
Create an account, get your broker credentials and connect your first device — no servers to install, patch or scale.
