Articles
MQTT, IoT messaging and how to run your projects on a free broker.
HiveMQ Cloud Serverless is shutting down: how to migrate before December 31, 2026HiveMQ is retiring its free Cloud Serverless MQTT plan. Key dates, what you lose, your options, and a step-by-step move to a free broker that keeps your ports and topics.
Free MQTT brokers in 2026: hosted options comparedA practical comparison of free hosted MQTT brokers for hobby and IoT projects in 2026: limits, history, privacy and what happens when you go over.
MQTT vs HTTP vs WebSockets vs CoAP: which protocol for your IoT project?How MQTT, HTTP, WebSockets and CoAP compare for sensors and smart devices: message model, overhead, power use and when to pick each one.
MQTT 5 vs MQTT 3.1.1: what changed and should you care?The practical differences between MQTT 5 and MQTT 3.1.1: reason codes, session and message expiry, topic aliases, shared subscriptions, user properties and request/response.
Connect an ESP32 to a free MQTT broker over TLSStep-by-step Arduino guide to connect an ESP32 to a hosted MQTT broker over TLS on port 8883 with PubSubClient: certificates, code, and fixes for common errors.