MQTT Cookbook: Logging Activity

It’s been a while since I actually posted here. Between finishing my Ph.D., the frustrations of the academic job market, and working on my book, I haven’t had nearly as much time for hobbies. But I have recently been learning about MQTT and have decided to post some simple “recipe” style Python scripts that would have helped me when I was just starting out.

The first script was inspired by the sudden upsurge of questions on Stack Exchange (such as this one and this one) which deal with logging activity on an MQTT topic. Since Mosquitto (and most other brokers) do not include a database to store messages, you have to implement logging on top of MQTT.

The simplest way to do this is simply to print the output of a topic to a text file. For testing purposes I am using the Mosquitto test broker and a few of the server’s internal metrics.

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