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esp32_fmdevkit
ESP32 Development Board for FM broadcasting. Complete DA Audio processing. The example/default Arduino firmware works as a Bluetooth Speaker (A2DP Sink). The code builds with the newest ESP32 Arduino Release.
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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.
Another option is looking at existing hobby-grade solutions doing a similar thing - https://github.com/dragon-engineer/esp32_fmdevkit seems to be aiming in the direction of your approach, but doesn't have great documentation on the hardware side right out of the gate.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.