uaCap:Discovery Subnet

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URN:          https://opcfoundation.org/wiki/index.php/Discovery/Subnet


Description
Subnet discovery is based on a special network protocol that allows OPC UA Clients to find OPC UA Servers connected to the local subnet. The list of servers can be filtered by capability acronyms.

Usage Considerations

  • Automatic detection instead of querying each node on the network
  • Filtering by capability to lookup the appropriate Servers.
  • Requires that the network has multicasting enabled.

Conformance Testing

Client Server

The Discovery Client Facet includes two alternative Conformance Units (CUs) for this capability:

  1. With LDS: Conformance Unit Discovery Client Find Servers on Network
  2. Without LDS: Conformance Unit Discovery Client Find Servers on Network using mDNS
  1. With LDS: Servers register themselves by calling the Register2 Service.
  2. Without LDS: Servers announce themselves using mDNS as defined in Subnet Discovery Facet.