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Android-BLE-Library
A library that makes working with Bluetooth LE on Android a pleasure. Seriously.
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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.
Read up on GAP (For connecting), GATT(For communicating), and Services(Things that receive/send data i.e. battery service, heartbeat service, etc.) for Ble and understand what they are. Every Service has a UUID, find out what that is and that will be what you write to. Then use a library to write to that Service. We use Nordic's Android library at my company because we use a Nordic board but you can use any one that you like. It is significantly easier with a library than using a stock android solution.