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MQTT

MQTT

MQTT is a lightweight publish/subscribe protocol for machine-to-machine and IoT communication.

Used at
mqtt.org github.com stackoverflow.com

About MQTT

MQTT is an ultra-lightweight protocol designed to efficiently send small messages between connected devices such as sensors and mobile phones. It uses a publish/subscribe architecture over TCP/IP and is particularly useful in environments with limited bandwidth or resources.

The protocol is standardized by OASIS and ISO, with MQTT 5.0 being the latest major version released in March 2019. It supports three levels of delivery guarantee (QoS 0, 1, 2), retained messages, and security mechanisms such as TLS and authentication.

MQTT enables two-way communication: devices can publish their data and subscribe to configuration messages. By using a central broker (for example Mosquitto, EMQX, or HiveMQ), systems become scalable, robust, and easy to manage-even when millions of devices are connected.

MQTT is used at

BolidenBoliden is the mining and metals company that supplies the metals for modern life, from copper to gold, with operations across the Nordics and Europe.
BudbeeBudbee delivers parcels with smart systems, environmentally friendly vehicles and flexible delivery solutions - direct to the door or to lockers, with a focus on customer experience.
FortumFortum not only powers your sockets - they also drive the transition to a greener future with energy that makes a difference.
ProptechOSProptechOS is a Swedish software company offering an operating system for buildings - a platform that harmonizes data for smarter, more efficient and sustainable property operations.
Redpill LinproRedpill Linpro helps companies across the Nordics succeed with digital innovation - always embracing open source and deep technical expertise.
Ubiquiti SwedenUbiquiti Sweden is the tech company building the networks of tomorrow - from its Stockholm office to the rest of the world.