Discover BACnet/IP devices and read object properties using Who-Is/I-Am and ReadProperty
domain: bacnet.org · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Broadcast a Who-Is request, optionally scoped to a device instance range, on the BACnet/IP network
Collect I-Am responses from devices, extracting each device's Device Instance number, network address, and capabilities
Cache the discovered device address bindings for later use
Send a ReadProperty request targeting a specific object (e.g., an Analog Input) and property (e.g., Present_Value) on a discovered device
Parse the returned property value and any status flags
Use WriteProperty with an appropriate priority array entry if you need to write back to a writable property
Known gotchas
BACnet/IP relies on UDP broadcast (standard port 47808) which typically will not cross subnet boundaries without a BACnet Broadcast Management Device (BBMD)
Firewalls frequently block port 47808 by default, silently preventing discovery
Exact property behavior can vary by vendor implementation - confirm against the specific device's PICS (Protocol Implementation Conformance Statement) rather than assuming standard defaults
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