mqtt5-wasm

MQTT v5.0 WebAssembly client and broker for browser environments.

Features

WebSocket transport - Connect to remote MQTT brokers
In-tab broker - Run a complete MQTT broker in the browser
MessagePort/BroadcastChannel - Inter-tab communication
Broker bridging - Connect multiple in-browser brokers via MessagePort
Full QoS support - QoS 0, 1, and 2
Automatic keepalive - Connection health monitoring

Installation

npm (browser/bundler)

npm install mqtt5-wasm

Cargo (Rust)

[dependencies]
mqtt5-wasm = "0.2"

Build with wasm-pack:

wasm-pack build --target web --features client,broker

Usage

import init, { WasmMqttClient } from "mqtt5-wasm";

await init();
const client = new WasmMqttClient("browser-client");

await client.connect("ws://broker.example.com:8080/mqtt");

await client.subscribe_with_callback("sensors/#", (topic, payload) => {
  console.log(`${topic}: ${new TextDecoder().decode(payload)}`);
});

await client.publish("sensors/temp", new TextEncoder().encode("25.5"));

Documentation

See the main repository for complete documentation and examples.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

mqtt5-wasm 0.2.2