The Local Discovery Server (LDS) is an OPC UA Server that implements the Discovery Service Set defined in OPC 10000-4. If an LDS is installed on a machine it shall use one or more of the well-known addresses defined in Table 72.
Table 72 – Well known addresses for Local Discovery Servers
|OPC UA TCP||opc.tcp://localhost:4840/UADiscovery|
|OPC UA WebSockets||opc.wss://localhost:443/UADiscovery|
|OPC UA HTTPS||opc.https://localhost:443/UADiscovery|
OPC UA applications that make use of the LDS shall allow administrators to change the well-known addresses used within a system.
The Endpoint used by Servers to register with the LDS shall be the base address with the path “/registration” appended to it (e.g. http://localhost/UADiscovery/registration). OPC UA Servers shall allow administrators to configure the address to use for registration.
Each OPC UA Server application implements the Discovery Service Set. If the OPC UA Server requires a different address for this Endpoint, it shall create the address by appending the path “/discovery” to its base address.