BACnet driver

BACnet/IP runs in the fieldbus container (network_mode: host), which polls devices and publishes readings to central over MQTTS. Central exposes the commissioning UI and REST routes; it never touches the BACnet wire itself.

Configuration

• config/fieldbus/ — device filters, NIC/BBMD, poll config for the fieldbus container
• Recipe: standalone runs fieldbus alongside central; edge runs fieldbus only and attaches to a remote central (see Build recipes)
• OPENFDD_BACNET_MODE — live for field buses

The fieldbus container owns UDP 47808 and the local diagnostic device (599999). Do not run a second BACnet server on the same host.

Key API routes

Method	Path	Purpose
POST	/api/bacnet/whois	Discover devices
GET	/api/bacnet/driver/tree	Driver tree
POST	/api/bacnet/read	Read present value
GET	/api/bacnet/poll/status	Poll loop status
POST	/api/bacnet/write-dry-run	Simulate write
POST	/api/bacnet/write	Live write — requires explicit approval

Overrides

Scan and export priority-array overrides:

• GET /api/bacnet/overrides/summary
• POST /api/bacnet/overrides/scan-once

Dashboard

BACnet tab (/bacnet) — scan, add devices, set poll rates, browse points.

BACnet writes affect live equipment. Use dry-run first. Agents must not write without human approval.