A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : CoAP Utilization for Building Control
Author(s) : Peter van der Stok
Kerry Lynn
Filename : draft-vanderstok-core-bc-05.txt
Pages : 32
Date : 2011-10-31
This draft describes an example use of the RESTful CoAP protocol for
building automation and control (BAC) applications such as HVAC and
lighting. A few basic design assumptions are stated first, then URI
structure is utilized to define group as well as unicast scope for
RESTful operations.
This proposal supports the view that 1) service discovery is
complementary to resource discovery and facilitates control network
scaling, and 2) building control is likely to move in steps toward
all-IP control networks based on the legacy efforts provided by DALI,
LON, BACnet, ZigBee, and other standards.
The authority portion of the URI is used to identify a device (group)
and the resulting DNS name is bound to a unicast (multicast) address.
Group addressing has consequence for the naming convention of the
resources of a device. Naming of URI is building or organization
dependent, must be flexible, and SHOULD conform to some local
convention. Naming of resources MUST be standardised preferrable by
a building control related organisation.
It is shown that DNS-based service discovery can be used to locate
URIs on the scale necessary in large commercial BAC deployments. The
relation of DNS-SD and a Resource Directory is discussed. Finally, a
method is proposed for mapping URIs onto legacy BAC resources, e.g.,
to discover application-layer gateways, proxies, and their dependent
services.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-vanderstok-core-bc-05.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-vanderstok-core-bc-05.txt
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