Environment variables

Variable	Purpose
BACNET_RPC_API_KEY	If set, require Authorization: Bearer on protected HTTP routes.
OFDD_ENABLE_OPENAPI_DOCS	If set, expose /docs, /redoc, /openapi.json and exempt them from Bearer in the auth middleware.
BACNET2MQTT_ENABLED	Enable BACnet2MQTT bridge.
MQTT_BROKER_URL	Broker URL for the bridge (and MQTT RPC gateway fallback).
MQTT_BASE_TOPIC	Bridge topic prefix.
MQTT_POLL_INTERVAL_SEC	Bridge poll interval.
MQTT_USER / MQTT_PASSWORD	Broker authentication.
MQTT_RPC_GATEWAY_ENABLED	Enable MQTT RPC gateway.
MQTT_RPC_BROKER_URL	Optional separate broker URL for the RPC gateway.
MQTT_RPC_TOPIC_PREFIX	RPC topic prefix (default diy-bacnet/gateway).
MQTT_RPC_TELEMETRY_INTERVAL_SEC	Telemetry interval; 0 disables periodic telemetry/status.
MQTT_RPC_CLIENT_ID	Optional MQTT client id.