How to discover mqtt publishers and the topics they publish?

1

New to mqtt. I get the publisher/subscriber and broker/client concepts but I have yet to find information on how I can sniff my network to find publishers and their respective topics?

2

Take a look at MQTT Explorer

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3

Subscribing to the topic # will receive everything. There are other wildcards you can use.

But browsing the topics in the broker with MQTT Explorer is easier.