Why do we use mqtt

Content on WhatAnswers is provided "as is" for informational purposes. While we strive for accuracy, we make no guarantees. Content is AI-assisted and should not be used as professional advice.

Last updated: April 8, 2026

Quick Answer: MQTT (Message Queuing Telemetry Transport) is a lightweight publish-subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks. It was created in 1999 by Andy Stanford-Clark of IBM and Arlen Nipper of Arcom (now Eurotech) specifically for oil pipeline monitoring via satellite. MQTT uses a client-server architecture where clients publish messages to topics, and a broker distributes them to subscribed clients, making it ideal for IoT applications. As of 2024, MQTT is standardized as ISO/IEC 20922 and is widely used in industries like automotive, manufacturing, and smart home systems.

Key Facts

MQTT was created in 1999 by Andy Stanford-Clark and Arlen Nipper for oil pipeline monitoring
MQTT uses a publish-subscribe model with topics and a central broker for message distribution
MQTT is standardized as ISO/IEC 20922 and OASIS MQTT Version 5.0 (2019)
MQTT supports three Quality of Service (QoS) levels: 0 (at most once), 1 (at least once), and 2 (exactly once)
MQTT is used in over 50% of IoT projects according to Eclipse Foundation surveys (2021-2023)

Overview

MQTT (Message Queuing Telemetry Transport) is a lightweight, open-standard messaging protocol designed for machine-to-machine (M2M) communication in Internet of Things (IoT) environments. It originated in 1999 when IBM engineers Andy Stanford-Clark and Arcom's Arlen Nipper developed it to monitor oil pipelines via satellite connections, requiring minimal bandwidth and power. The protocol was standardized in 2013 by OASIS, with MQTT 3.1.1 becoming an ISO standard (ISO/IEC 20922) in 2016. MQTT operates on a publish-subscribe model, where devices (clients) send messages to a central server (broker) that distributes them to interested subscribers. This design makes it highly scalable for constrained devices, such as sensors and microcontrollers, often operating on battery power with limited memory. By 2020, MQTT had become a cornerstone of IoT ecosystems, supported by major cloud platforms like AWS IoT Core and Microsoft Azure IoT Hub.

How It Works

MQTT functions through a client-broker architecture where clients (e.g., sensors or applications) connect to a broker over TCP/IP. Clients publish messages to specific topics, which are hierarchical strings like "home/temperature/livingroom." The broker receives these messages and forwards them to all clients subscribed to those topics, enabling efficient one-to-many communication. MQTT includes three Quality of Service (QoS) levels: QoS 0 (at most once) for fast, unreliable delivery; QoS 1 (at least once) for guaranteed delivery with possible duplicates; and QoS 2 (exactly once) for assured, duplicate-free delivery. The protocol also features a "Last Will and Testament" mechanism, where clients can specify a message to be published if they disconnect unexpectedly, and retained messages that allow new subscribers to receive the latest data. MQTT 5.0, released in 2019, added enhancements like improved error reporting and topic aliases to reduce bandwidth usage further.

Why It Matters

MQTT is crucial for modern IoT applications due to its efficiency and reliability in resource-constrained environments. It enables real-time data exchange in industries like automotive (e.g., Tesla uses MQTT for vehicle telemetry), manufacturing (monitoring equipment on factory floors), and smart homes (controlling devices via platforms like Home Assistant). In healthcare, MQTT facilitates remote patient monitoring by transmitting vital signs from wearable sensors to cloud servers. Its low overhead reduces network congestion and power consumption, extending battery life for devices—key for environmental sensors in agriculture or infrastructure monitoring. By standardizing communication across diverse devices, MQTT supports scalable IoT deployments, driving innovations in smart cities and industrial automation, with projections estimating over 75 billion connected devices by 2025.