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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.
Serval Project did it for a number of years https://www.servalproject.org/. Using mesh networking and existing phones wifi. They were initially designing the solution for emergency/disaster relief scenarios and had success in trials. I played with it on my mobile devices and was pleasantly surprised. If you are geeky; think batman mesh with asterisks, using your mobile phone. Not too sure what happened with it though. If you're not geeky, think airdrop but with a phone conversation, roughly the same distance
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