MQTTX

MQTTX provides a desktop, command‑line, and web client for interacting with MQTT brokers, supporting MQTT 5.0 as well as the older 3.1.1 and 3.1 specifications. It runs on macOS, Windows, and Linux, allowing users to connect to a broker, publish messages in formats such as JSON, Base64 and Hex, and subscribe to multiple topics with visual cues in the GUI or equivalent commands in the CLI.

The tool includes additional utilities aimed at developers, including scripting support, benchmark testing, and IoT data simulation, as well as an AI‑assisted assistant for MQTT‑related tasks. These features are intended to streamline the development and testing workflow for applications that rely on MQTT messaging.

MQTTX is positioned for developers, testers, and engineers who need a unified interface for MQTT operations across different environments, offering both graphical and command‑line interactions while maintaining full protocol compliance.