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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.
If you don't have the budget for real hardware consider the simulator at https://wokwi.com/ It works with Rust (at least for ESP32, haven't tried other architectures). Bonus: you can't blow up the electronics by a wiring mistake.
NOTE:
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Hence, a higher number means a more popular project.