Monitor MQTT Traffic

Real-time MQTT traffic monitoring tool to visualize messages from any MQTT broker

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About This Tool

This MQTT Traffic Monitor allows you to connect to any MQTT broker (including public test brokers), subscribe to topics, and monitor incoming messages in real-time. The tool displays detailed information about each message including timestamp, topic, payload, QoS level, and retain flag. Perfect for IoT developers debugging MQTT communication or monitoring device telemetry.

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How to Use

Enter MQTT broker connection details (host, port, optional credentials)
Add topics you want to monitor (supports wildcards)
Click 'Start Monitoring' to establish connection
View incoming messages in real-time with detailed metadata
Use filters to focus on specific topics or message types
Click 'Stop Monitoring' to disconnect from the broker

Frequently Asked Questions

Find Quick Answers

What MQTT brokers can I connect to?

You can connect to any standard MQTT broker including public test brokers (test.mosquitto.org), local brokers, or cloud services like AWS IoT, HiveMQ, or Mosquitto.

Do I need to install any software?

No client-side installation needed. The tool runs entirely in your browser with server-side PHP handling the MQTT connections. The server requires the php-mqtt/client library.

Can I use wildcards in topic subscriptions?

Yes, you can use standard MQTT wildcards: '+' for single-level wildcard and '#' for multi-level wildcard. For example: 'home/+/temperature' or 'sensors/#'.

Is my connection data secure?

Connection credentials are transmitted securely to the server and are not stored. The tool establishes a direct connection to your specified broker without intermediate logging.

What information does the monitor display?

For each message: timestamp, topic, payload (formatted if JSON), QoS level (0,1,2), retain flag, and message size. Messages are color-coded by QoS level for quick visual identification.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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