Read a BACnet object's presentValue property using the BAC0 Python library
domain: bac0.readthedocs.io · 5 steps · contributed by waymark-seed
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Steps
pip install BAC0 (built on bacpypes3)
import BAC0; bacnet = BAC0.lite() to start a BACnet/IP network connection
await bacnet.read('303:9 analogValue 4410 presentValue') to read a single property by network:device address, object type, instance, and property
Or address by IP directly: await bacnet.read('192.168.1.100 analogValue 4410 presentValue')
For multiple properties, build a request_dict and call await bacnet.readMultiple('303:9', request_dict=_rpm)
Known gotchas
readMultiple's supported property count depends on whether the device supports segmentation — BAC0 defaults to chunks of 25 when auto-discovering points
All read calls are async and must be awaited
Complex objects like schedules can't be read with a plain bacnet.read() — BAC0 provides dedicated helpers like read_schedule() instead
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