hivemq/hivemq-mqtt-client

Health v2 · maintenance only

Adoption not part of the score

1116 stars · 184 forks observed · 2026-09-01

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

HiveMQ MQTT Client is a high-performance Java client library implementing MQTT 5.0 and MQTT 3.1.1 with reactive, asynchronous, and blocking API flavors. It provides full protocol feature coverage, backpressure support, TLS/WebSocket/proxy transports, and automatic reconnect and message redelivery handling.

Use cases

• connect a Java application to an MQTT broker
• publish and subscribe to MQTT topics with QoS 1 and 2
• build an IoT device or backend client in Java
• consume MQTT messages as a reactive stream with backpressure
• connect to MQTT over TLS or WebSocket through a proxy
• handle MQTT reconnection and message redelivery automatically

When to choose

• you need a production-grade MQTT client on the JVM
• you want reactive (RxJava/Reactor), async, or blocking APIs for MQTT
• you need full MQTT 5.0 features like topic aliases and enhanced authentication
• backpressure and manual message acknowledgment matter for your pipeline

When to avoid

• you are not on the JVM (Java/Kotlin/Scala)
• you need an MQTT broker rather than a client
• you want a lightweight embedded client for microcontrollers

Facets

library · maturity stable

http-client streaming concurrency iot developer-tools jvm cross-platform mqtt mqtt5 mqtt-client reactive-streams rxjava reactor backpressure iot-messaging messaging

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