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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Me and a colleague have used two of them for a talk in 2018, with another super useful demo: shaking one device triggered a call to an Azure Function who called a direct method on the other device to power up a PC fan to move polystyrene balls in a ball. Yep we did that, code is here if you're interested.
I have also built another traffic light program, as I was running out of stupid project ideas, and I needed a pet project to continue to use this DevKit. The code is available on my GitHub, I enjoy working on it from time to time, but I have to admit that coding C/C++ can be hard sometime, especially when working with strings, JSON serialization, and sometimes the compiler throws an error out of nowhere that seem impossible to tackle.