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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 recommend using a GUI Bluetooth explorer so you can see how your device represents its data. Here's one I found by Googling, and I can highly recommend the LightBlue app for iPhone. There, you can look for the "Battery Service" Service, 0x180F (may also appear as its UUID, 0000180f-0000-1000-8000-00805f9b34fb), and its "Battery Level" Characteristic, 0x2A19 or 00002a19-0000-1000-8000-00805f9b34fb. Characteristics are pieces of data within services.
NOTE:
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Hence, a higher number means a more popular project.