Practical guides on MQTT, managed brokers and connected products from the ConnectMQ team.
TinyML is machine learning on microcontrollers that run on milliwatts and kilobytes. This explainer covers the constraints, the frameworks, real use cases and why tiny devices publish compact inference results over MQTT.
Measure tank level with a waterproof ultrasonic sensor, convert distance to litres and percent full on an ESP32, and publish retained MQTT readings plus debounced low-level alerts.
A practical reference to every Sparkplug B data type, the Protobuf field each one travels in, metric properties such as Quality, metric flags and DataSets, with decoded examples and common conversion mistakes.
A practical guide to testing MQTT from a browser: how web clients connect over WebSockets, a step-by-step session with the ConnectMQ portal client, a tiny MQTT.js client of your own and fixes for common connection errors.
MQTT has just 15 control packet types. This reference explains each one, from CONNECT to AUTH, with its type number, direction, first byte and what it looks like in debug logs while you troubleshoot.
Detect motion with an HC-SR501 or AM312 PIR on an ESP32, debounce noisy triggers, publish motion events over MQTT and keep a retained last-motion timestamp for dashboards and automations.
Build a battery-friendly ESP32 sensor that wakes on a timer, connects quickly, publishes a retained reading, confirms it reached the broker and goes back to deep sleep.
Build a web digital twin dashboard where a Three.js scene, KPI cards, a trend chart and an alarm list share one MQTT connection and one state store, with click-to-focus navigation and stale-data handling.
Network links fail, but industrial data should not disappear. Learn how store and forward works for MQTT edge devices, how to size the buffer, keep replay ordered and throttled, and build it with Python and SQLite.
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.
Report by exception publishes a value only when it changes meaningfully. Learn how deadbands, rate limits and heartbeats work together, and run a Python gateway that applies RBE before publishing to MQTT.
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.
A practical seven-step process for building your first digital twin: scope it, model the asset, design MQTT topics, stream live data, secure the broker, visualize it and add history.
Food and beverage plants live on temperature, hygiene and throughput. See the IoT use cases that matter most, how to structure the MQTT data and what to watch out for in wet, regulated environments.
Enterprises evaluate MQTT brokers on isolation, deployment control, security, operations and support. This guide turns those expectations into a concrete checklist.
A practical MQTT vs HTTP comparison for IoT covering message overhead, push versus polling, battery life and connection models, with a small benchmark you can run yourself.
An MQTT DMZ lets plant data reach the cloud without opening a single inbound port to the OT network. This guide covers outbound-only patterns, DMZ bridge brokers, firewall rules and the mistakes that weaken the design.
An MQTT broker as a service removes server work, but not every responsibility. Here is a clear split between what the provider handles and what stays with you, with a practical integration pattern.
Configure a Mosquitto bridge on a Raspberry Pi that forwards selected local topics to a cloud MQTT broker over TLS, receives commands back, queues messages during outages and avoids message loops.
A practical guide to IIoT data modeling: how to move from flat PLC tags to structured, reusable information models using ISA-95, Sparkplug B templates and OPC UA, published over MQTT.
Azure Digital Twins is not the only way to model connected assets. Compare open-source platforms and lightweight stacks built on standard MQTT, and see how to model a twin graph without platform lock-in.
Build an Android app in Kotlin that connects to an MQTT broker over TLS, subscribes to alarm topics, raises system notifications and reconnects correctly as the app moves between foreground and background.
Every Sparkplug B message travels on a strictly defined topic. This guide breaks down spBv1.0, group ID, message type, edge node ID and device ID, with naming rules, wildcard patterns and common mistakes.
Why paho-mqtt clients silently stop receiving or lose messages after a network drop, and a tested Python client that adds backoff with jitter, resubscription, an offline queue and persistent MQTT 5 sessions.
Connect a Telegram bot to an MQTT broker with Python so alarms arrive in your chat and commands like /on, /off and /status travel back to devices, with a chat allowlist for safety.
Connect RS-485 Modbus RTU energy meters and sensors to a gateway that publishes their readings over MQTT. Covers wiring, termination, serial settings, register maps and a complete Python poller.
Configure a retained Last Will and Testament plus a birth message on the ESP32 so every dashboard and script can see device availability instantly, including after crashes, power cuts and Wi-Fi loss.
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.
How to turn real MQTT payloads into clean InfluxDB metrics with Telegraf: json_v2 fields, tags, renames and types for nested JSON, object parsing for arrays, and topic_parsing to extract site, line and machine from the topic.
Use Spring Integration's MQTT 5 adapters in Spring Boot to consume device telemetry over TLS, keep the latest readings in memory, expose them through REST and send commands back to devices.
Create an account, get your broker credentials and connect your first device — no servers to install, patch or scale.
