An DiscoveryUrl has the form:
scheme://hostname:port/path
scheme: the protocol used to establish a connection.
hostname: the domain name or IPAddress of the host where the Server is running.
port: the TCP port on which the Server is to be found.
path: additional data used to identify a specific Server.
Table 159 – DiscoveryUrl to DNS SRV and TXT Record Mapping
|
URL Field |
Mapping |
||||
|
scheme |
The scheme maps onto SRV record service field. The following mappings are defined at this time:
The OPC UA service names are assigned by IANA. Additional service names may be added in the future. The endpoint shall support the default transport profile for the scheme. |
||||
|
hostname |
The hostname maps onto the SRV record target field. If the hostname is an IPAddress then it shall be converted to a domain name. If this cannot be done then LDS shall report an error. |
||||
|
port |
The port maps onto the SRV record port field. |
||||
|
path |
The path maps onto the path string in the TXT record (see Table 158). |
Suitable default values should be chosen for fields in a SRV record that do not have a mapping specified in Table 159. e.g. TTL=86400, class=IN, priority=0, weight=5