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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're trying to build a totally custom thing, it looks like there's a library to use the ESP32 as a bluetooth keyboard. https://github.com/T-vK/ESP32-BLE-Keyboard
NOTE:
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Hence, a higher number means a more popular project.