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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'd personally grab something like https://github.com/hopkinskong/esp32-ssh-server and hack public key auth I to it, but I can imagine hacking some old 3G modems would be a lot more fun.
I actually developed this for the same purpose:
https://github.com/Depau/wi-se-sw/
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