DNS-Based Service Discovery Records Sample Clauses

DNS-Based Service Discovery Records. DNS-Based Service Discovery (DNS-SD) defines a conventional method of configuring DNS PTR, SRV, and TXT records to facilitate discovery of services (such as CoAP servers in a subdomain) using the existing DNS infrastructure. DNS-SD Service Names are limited to 255 octets and are of the form: Service Name = {Instance}.{Service}.{Domain} The {Domain} part of the service name is identical to the global (DNS subdomain) part of the authority in URIs that identifies the resources on an individual server or group of servers. The {Service} part is comprised of at least two labels. The first label of the pair is an underscore character generally followed by the application protocol name [I-D.ietf-tsvwg- iana-ports]. The second label is always "_udp" for CoAP services. In cases where narrowing the scope of the search may be useful, these labels may be optionally preceded by a subtype label (beginning with an underscore) followed by the "_sub" label. An example of the {Service} part is "_lamp._sub._dali._udp". Only the rightmost pair of labels is used to name SRV and TXT records. The default {Instance} part of the service name may be set at the factory or during the commissioning process. It uniquely identifies a {Service} within a {Domain}. Taken together, these elements comprise a unique name for an SRV record (and optionally a corresponding TXT record) within the DNS sub-domain. The service instances (value of PTR records) are the labels of the SRV, AAAA and TXT records describing the service instance. The SRV record specifies the location (authority) and the port number. The AAAA record specifies the IP-address, while the TXT record specifies the subtype and the data representation of the legacy parser (e.g. if = ZigBee).
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Related to DNS-Based Service Discovery Records

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