Connect your devices and applications with production-ready client libraries for 20+ languages. Each comes with comprehensive guides, code examples, and best practices.
Safety-first, realistic, and behavior-predictable MQTT messaging SDK designed for the AI era.
Clear APIs optimized for LLM code generation
QUIC & gRPC support for high-performance scenarios
Explicit error handling, no hidden complexity
Full MQTT v5.0 with async/await support
let client = TokioAsyncMqttClient::new(
options, handler, config
).await?;
client.connect_sync().await?;
client.subscribe_sync("sensors/#", 1).await?;
client.publish_sync(
"sensors/temp",
b"23.5",
1,
false
).await?;Select your preferred programming language to access SDK documentation, quick-start guides, and code examples
Production-ready code examples across 20+ languages with real-world use cases
End-to-end examples from connection to data transmission
Advanced configurations for secure communications
Industry-standard approaches to IoT development
Learn at your own pace with progressive examples
From rapid prototyping to enterprise production—find the perfect fit for your IoT journey
Quick testing
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Best for: learning & prototyping
broker.emqx.io
Most popular
Fully-managed MQTT service with generous free tier. Deploy your dedicated broker in seconds.
Best for: startups & production apps
No credit card required
Enterprise grade
Self-managed MQTT platform for mission-critical applications. Maximum control and scalability.
Best for: Large-scale enterprise projects
Custom pricing
Specialized and emerging MQTT client libraries
A high-performance asynchronous client for Python based on asyncio.
Integrates MQTT seamlessly into modern Python web applications built with FastAPI.
An MQTT client specifically for the Qt application framework, written in C++.
A popular MQTT client for the .NET framework, widely used in Unity game development.
A lightweight MQTT client designed for MicroPython on memory-constrained devices.
An MQTT client library for developing Android applications with Kotlin or Java.
A lightweight and portable MQTT client in C, designed for embedded systems.
A pure Ruby client for using the MQTT protocol in Ruby applications.
An MQTT client for the lightweight Lua scripting language, ideal for embedded systems.
Everything you need to know about MQTT clients
An MQTT client is a library or application that implements the MQTT protocol. It allows your device or application to connect to an MQTT broker (like EMQX), and then publish messages to topics or subscribe to topics to receive messages.
We recommend these libraries because they are mature, well-maintained, and feature-complete. They have strong community support and provide excellent support for MQTT v5, which is crucial for building modern, robust IoT applications.
MQTT v5 is a major upgrade, introducing critical features like reason codes for better error reporting, user properties for metadata, shared subscriptions for load balancing, and session expiry for more flexible client sessions.
Always use TLS/SSL (MQTTS) to encrypt traffic. Additionally, all clients should authenticate with the broker using mechanisms like username/password, client certificates, or JWT authentication, all supported by EMQX.
QoS defines the guarantee of message delivery. QoS 0 means "at most once" (fire and forget), QoS 1 means "at least once" (guaranteed delivery, but duplicates may occur), and QoS 2 means "exactly once" (guaranteed delivery with no duplicates).