Siemens Schweiz Ag

Siemens Aktiengesellschaft

Bernhard Isler

Jürgen Gessner

Christoph Niedermeier

Norbert Vicari

Kai Rohrbacher

Frank Liese

Various teachings include methods and/or BACnet network systems to extend BACnet network systems for building automation systems to scale up to large topologies. The BACnet network system comprises a network of BACnet devices organized as a virtual hub-and-spoke network. One of the BACnet devices is implemented as a directed hub-device to which all other BACnet devices are connected as node-devices by using WebSocket connections. The directed hub-device is configured to limit the broadcast distribution of broadcast messages from a downlink-connection to each uplink-connection, and not to any other downlink-connection. The directed hub-device is configured to block or forward unicast messages from one downlink-connection to another downlink-connection.

Extending BACnet systems to scale up to large topologies

The Specific service instances are requested by a client via a client application. The request is received by a Domain Name System (DNS). The request is resolved by the DNS by determining from information recorded in a DNS system memory and conveyed in the request, a first type Tof service and a first list Lof service instances associated with the first type T. The DNS then searches for a linked structure in a TXT resource record for the first type T. The linked structure identifies another list Lof service instances associated with a subtype Tof service. Then iteratively, for i=2, . . . , N+1, N being a number of the subtypes of service associated with the first type Tof service, searching a TXT resource record for a linked structure identifying a corresponding subtype Ti of service and identifying a list Li+1 of service instances associated with the subtype Ti+1.

Method and system for domain name system based discovery of devices and objects

A private key and a public key are provided during manufacture of a device and are stored in the device. At least one cryptographic key is subsequently negotiated, the negotiation being security-protected as a function of the generated private key and/or the public key. This method can find application in building automation.

Growing community of inventors

Wilen b. Wollerau, Switzerland

Bernhard Isler