eclipse-paho/paho.mqtt.c

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

2359 stars · 1176 forks observed · 2026-08-28

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

The Eclipse Paho C client library for the MQTT protocol, enabling applications to connect to an MQTT broker to publish messages and subscribe to topics. It provides synchronous and asynchronous APIs with optional SSL/TLS support, plus sample command-line publish/subscribe utilities.

Use cases

• connect a C application to an MQTT broker
• publish and subscribe to MQTT topics from C
• add MQTT 5.0 messaging to an IoT device
• implement MQTT client with SSL/TLS in C
• build asynchronous MQTT messaging in C
• send sensor data over MQTT from embedded Linux

When to choose

• you need a mature, well-documented C MQTT client supporting MQTT 3.1.1 and 5.0
• you want both synchronous and asynchronous programming models
• you need SSL/TLS-secured MQTT connections on Windows, Linux, or macOS

When to avoid

• you need a client in a higher-level language like Python or Java (use the Paho bindings for those)
• you need MQTT-SN or a broker rather than a client library

Facets

library · maturity stable

http-client networking sdk cli iot developer-tools embedded-systems windows c cpp cross-platform mqtt mqtt-client pub-sub mqtt5 ssl-tls eclipse-paho iot-messaging messaging linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="eclipse-paho/paho.mqtt.c")