Now Available
ReplyQT (MQTT Recording For Replay) is a desktop application now available for macOS (arm64, x86_64) and Linux. It captures MQTT messages from any broker and replays them at configurable speed, allowing IoT developers to test and debug without physical hardware.
Built with a production-grade C11 backend and a PySide6 desktop GUI, ReplyQT supports TCP, SSL/TLS, WebSocket, and WebSocket Secure transports. A plugin-based storage system allows messages to be persisted to flat files, SQLite (and more in future) with a hot-reloadable shared object plugin SDK.
Visit replyqt.altirratech.eu →
Key Features
- Recording: subscribe to any broker topics, persist messages with QoS, retained flags, and timestamps
- Configurable Replay: speed multiplier (0.1x to 10x), loop count, topic filtering
- Dual Control: interactive console, remote UDP command protocol, and desktop GUI
- Sensor Simulator: 7 preset configurations with curve editor and interpolation
- Plugin Storage: hot-reloadable .so plugins with versioned API (Filesystem, SQLite included)
- Cross-Platform: macOS (arm64, x86_64) and Linux, with headless daemon mode
- Dark Mode GUI: connection panel, media-style controls, real-time state diagram, metrics dashboard
Status
Live: Production-ready C backend at v3.0.3. Desktop GUI released for macOS and Linux. Freeware demo available. Maker Faire Rome debut: October 2026.
Learn More
Visit the dedicated project site at replyqt.altirratech.eu for the latest news, downloads, and documentation.