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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.
I made some experiments few months ago, with mild success. I cannot remember exactly what documentation/guide I followed, but it was probably the Xtensa Rust quickstart (or at least that should be a good start). I was able to compile a project that used pins, but I could not make wifi work (and I am using ESP8266 exactly because I need wifi).
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