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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 was hopeful that Web Bluetooth might be a solution, but going by its implementation status, it's blanket unavailable on iOS. I've looked up other solutions but ones I've found either require downloading a unique app (eg Bluetooth For Arduino) or a straight-up cable connection.
NOTE:
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Hence, a higher number means a more popular project.