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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.
They have working examples in Java at https://github.com/onyx-intl/OnyxAndroidDemo
A couple of examples from the community: * my Gentle Glow https://github.com/calin-darie/gentle-glow-onyx-boox * Karino's PNG Note https://github.com/karino2/PngNote https://www.reddit.com/r/Onyx_Boox/comments/p5hygq/pngnote_for_boox_note_app_for_boox_device_only/
A couple of examples from the community: * my Gentle Glow https://github.com/calin-darie/gentle-glow-onyx-boox * Karino's PNG Note https://github.com/karino2/PngNote https://www.reddit.com/r/Onyx_Boox/comments/p5hygq/pngnote_for_boox_note_app_for_boox_device_only/