Practical guides on MQTT, managed brokers and connected products from the ConnectMQ team.
Matter and MQTT are often compared, but they solve different problems. Learn what each does, where they overlap, and how a Home Assistant setup can use Matter for devices and MQTT for everything that needs to travel.
The EU Cyber Resilience Act sets cybersecurity requirements for products with digital elements. Learn what it asks of connected devices and how secure MQTT connectivity supports your work.
Switch an ESPHome device from the native API to MQTT so Node-RED, Python scripts, dashboards and Home Assistant can all read and control it through one broker.
Learn how to collect execution state, active program, spindle load and part count from CNC machines, publish them over MQTT and turn them into an honest utilization number.
A practical blueprint for smart parking with IoT: choose bay sensors, design MQTT topics, aggregate free spaces per zone and drive a live browser map over secure WebSocket.
A small Python service that publishes CPU temperature, load, memory, disk usage and under-voltage flags from every Raspberry Pi to MQTT, with a last will so you know when a Pi goes offline.
Learn to publish MQTT messages from a PHP web request and run a long-lived PHP subscriber worker with php-mqtt/client, including TLS, reconnects, graceful shutdown and Laravel-friendly patterns.
A practical use case for injection molding monitoring: publish one MQTT message per shot with cycle time, cushion, pressure and temperatures, then flag drifting shots before bad parts pile up.
Turn a Raspberry Pi with a CAN HAT into a gateway that reads frames with python-can, decodes signals from a DBC file and publishes rate-limited JSON to an MQTT broker.
How to build a warehouse digital twin that tracks inventory movement, AGVs and conveyor states in a live 3D model fed by MQTT topics, with topic design, code and pitfalls.
Manual sheets, PLC tags, retrofit sensors and edge gateways all collect shop floor data differently. Compare the methods, pick the right one per machine and centralize everything on one MQTT namespace.
Turn on MQTT in Shelly Gen2 and Gen3 devices, learn exactly which topics they publish and accept, control relays with simple commands or JSON-RPC, and connect them securely to a cloud broker.
Build a motion detector with a Raspberry Pi camera and Picamera2, save a snapshot when something moves, and publish motion events with snapshot links over MQTT so dashboards, phones and automations can react.
A practical tutorial for running Ollama on an IoT gateway, subscribing to MQTT telemetry and publishing structured, AI-generated insights back to the broker without sending data to an external AI service.
Learn how in-line sensors, gauges and test stations publish measurements over MQTT for real-time quality checks, how to design topics and payloads, and how the same data feeds SPC and traceability.
Old machines still make most of the parts in many plants. This guide shows how to retrofit legacy machines for IoT with current clamps, add-on sensors and a gateway, and publish machine state over MQTT without touching a line of PLC code.
PubSubClient prints "failed, rc=-2" and nothing else? This guide decodes every state code from -4 to 5 and gives tested fixes for DNS, port, TLS, client ID and credential problems.
How TLS 1.3 changes MQTT connections: fewer round trips, a smaller set of strong cipher suites and different trade-offs for microcontrollers. Includes Python, Node.js, Mosquitto and OpenSSL examples.
A practical guide to MQTT audit logging: which events matter for security and compliance, what fields to capture, where logs come from in a managed setup, and how to build a simple pipeline.
How to encode the ISA-95 equipment hierarchy into MQTT topics: level order, leaf design, wildcard planning, payload choices and the common pitfalls, plus how Sparkplug B data can be republished into the same tree.
A step-by-step explanation of how MQTT works, from opening a TCP connection to CONNECT, SUBSCRIBE, PUBLISH, keep alive and disconnect, with a trace you can reproduce on a public broker.
Learn what Frigate NVR publishes over MQTT, how to read the frigate/events payload and how to forward only the detections that matter to a cloud broker for remote notifications.
Drive a NEMA 17 stepper from MQTT position commands with an ESP32, AccelStepper and an A4988 or DRV8825 driver, and publish live progress so apps know where the motor is.
Serialize sensor readings and parse incoming JSON commands with ArduinoJson 7 on an ESP32, publish them over MQTT with PubSubClient, and avoid the buffer and memory pitfalls that silently drop messages.
How to keep a digital twin and its physical asset in sync: reported and desired state, version numbers, conflict handling, reconnect recovery and retained MQTT topics, with a working Python device.
Wireless industrial sensors make it cheap to measure what was never wired. This guide compares the main radio technologies and shows how data from each one reaches a single MQTT broker, with a working LoRaWAN-to-MQTT bridge.
Turn a Raspberry Pi Sense HAT into a two-way MQTT device: publish environment and orientation readings as JSON, and scroll messages sent from any MQTT client across the 8x8 LED matrix.
Build one cross-platform .NET MAUI app with MQTTnet that displays live telemetry and sends commands to devices, handles app lifecycle reconnects and runs against a ConnectMQ broker.
The single-level + and multi-level # wildcards let one MQTT subscription cover many topics. Learn the exact matching rules, the edge cases and how to test every filter on a live broker.
Build a lightweight digital twin where every property is a retained MQTT topic. Viewers get full twin state the instant they subscribe, with no database. Includes a Python simulator, a Node.js viewer and cleanup commands.
Create an account, get your broker credentials and connect your first device — no servers to install, patch or scale.
