For last few months I work on device diagnostic and health monitoring software. I have already some prototype which I plan to release. I call it 'mqguard'

Its divided into two parts:

• Backed diagnostics daemon. Written in python. Its responsibility is monitoring MQTT traffic and apply some checking rules to it. It can detect anomalies such as error codes, invalid values, timeouting or flooding and other things.
• Frontend user interface. It's single page web application written in JavaScript. This part of diagnostics communicates with daemon over websockets and displays realtime data to user.

Here are some sreenshots:

I plan to release alfa version very soon. I'm writing build and deploy instructions, documentation and fixing some minor bugs.