eclipse-paho/paho.mqtt.cpp

Health v2 · maintenance only

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1324 stars · 472 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

The Eclipse Paho MQTT C++ client library lets modern C++ (C++17+) applications connect to MQTT brokers to publish messages, subscribe to topics, and receive messages, supporting MQTT v3.1, v3.1.1, and v5. It wraps the Paho C library and adds a modern C++ interface with SSL/TLS and WebSocket transports, automatic reconnect, offline buffering, and blocking plus non-blocking APIs.

Use cases

• connect to an MQTT broker from a C++ application
• publish and subscribe to MQTT topics in C++
• MQTT v5 client library for C++
• send IoT sensor telemetry over MQTT from C++
• add pub/sub messaging with TLS to a C++ desktop or server app
• asynchronous MQTT client with automatic reconnect and offline buffering

When to choose

• You need MQTT v3.1/v3.1.1/v5 support in a modern C++17 codebase
• You require secure transports (SSL/TLS, secure WebSockets) and proxy support
• You need reliability features like automatic reconnect, offline buffering, and configurable message persistence
• You want both blocking and asynchronous (non-blocking) messaging APIs

When to avoid

• You need an MQTT broker/server rather than a client library
• You target bare-metal or OS-less embedded devices (this library is for memory-managed OSes like Linux, macOS, and Windows)
• Your project cannot use C++17 or depends on the separate Paho C library being unavailable
• You need a pure C or another language binding - use paho.mqtt.c or another Paho client instead

Facets

library · maturity stable

message-queue networking sdk iot networking windows cross-platform cpp mqtt mqtt-client pub-sub iot-messaging tls websockets asynchronous-api offline-buffering automatic-reconnect message-persistence cpp17 eclipse-paho messaging linux macos

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