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bacnet-stack
BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services.
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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.
Fully open source: https://github.com/bacnet-stack/bacnet-stack/tree/master/ports/esp32 I've used this one before, but not on an esp32
NOTE:
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Hence, a higher number means a more popular project.