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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.
Of significant stuff I wrote an nRF52 "core" (not Arduino core, it's for using with arm-gcc and makefiles) with necessary functions to feel comfortable there: https://github.com/ultimaterobotics/urf_lib - apart from simpler stuff like timers, uart, radio handlers and star protocol, I also made a custom implementation of BLE peripheral device (4.2-ish, hadn't implemented everything from 4.2, only parts I needed - that indeed was terribly complicated, if Nordic had their softdevice open sourced, I wouldn't do that). Since then I've added there fast ADC, PWM, SPI with DMA, persistent storage parts but those are not yet published.