Client BACnet (external devices)

The same BACnet Application that hosts your CSV objects acts as a client on the LAN: Who-Is / I-Am, Read Property, Write Property, RPM, etc. Core logic lives in bacpypes_server/client_utils.py; JSON-RPC wrappers in bacpypes_server/rpc_methods.py.

Feature matrix

Feature	RPC method	Notes
Who-Is range scan	client_whois_range	Returns device list (addresses, vendor, max APDU, etc.).
Read one property	client_read_property	Returns { "<property_identifier>": <encoded> }.
Write property (priority / release)	client_write_property	JSON null or "null" + priority to release a slot.
Read Property Multiple	client_read_multiple	Chunked internally (25 object/property pairs per chunk).
Object list + names + commandable heuristic	client_point_discovery	object-list, RPM for object-name and priority-array.
Priority array (one object)	client_read_point_priority_array	List of { priority_level, type, value }.
Supervisory-style summary	client_supervisory_logic_checks	Commandable points and override slots from RPM.
Who-Is-Router-To-Network	client_whois_router_to_network	Router / network list from the stack NSE.

client_whois_range

• Params: { "request": { "start_instance": 1, "end_instance": 3456799 } } (defaults match Open-FDD style scans.)
• Returns: BaseResponse with data.devices.

client_read_property

• Params: { "request": { "device_instance": 123456, "object_identifier": "analog-value,1", "property_identifier": "present-value" } }
• Object identifier: e.g. analog-value,1 (validated against BACpypes3 ObjectType).
• Returns: single-key dict with encoded value.

client_write_property

• Params: { "request": { "device_instance", "object_identifier", "property_identifier", "value", "priority": <optional 1–16> } }
• Release: "value": null or "value": "null" with the same priority to release.
• Returns: { "status": "success", "response": "..." } on success.

client_read_multiple

• Params: { "request": { "device_instance": 123456, "requests": [ { "object_identifier", "property_identifier" }, ... ] } }
• Returns: BaseResponse with data.results: list of { object_identifier, property_identifier, property_array_index, value } (value may be an error string per object/property).

client_point_discovery

• Params: { "instance": { "device_instance": 987654 } }
• Returns: BaseResponse with data including device_address, device_instance, objects: [ { "object_identifier", "name", "commandable" }, ... ].

client_supervisory_logic_checks

• Params: { "instance": { "device_instance": 987654 } }
• Returns: SupervisorySummary-compatible dict: device_id, address, points, points_with_overrides, summary.

client_read_point_priority_array

• Params: { "request": { "device_instance", "object_identifier" } }
• Returns: array of priority slots (not wrapped in BaseResponse).

client_whois_router_to_network

• Params: {}
• Returns: BaseResponse with data.routers.