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MarcandCopilot
60945ce559
UdpDatagramTransport joined multicast groups on the resolved network interface (the connection address's NetworkInterface, the PreferredNetworkInterface option, or the first operational interface), but it never set IP_MULTICAST_IF / IPV6_MULTICAST_IF. Multicast data and discovery announcements therefore left through the operating system's default multicast route. On a computer with several network interfaces, a publisher configured for one network sent on another, and subscribers on the configured network missed the messages (OPC 10000-14 7.3.2.2, NetworkAddressDataType.NetworkInterface). ConfigureSocket now sets the multicast send interface to the resolved interface for IPv4 and IPv6 sockets, including the separate socket that sends discovery announcements for loopback-bound connections. A failure is logged at Debug level, like the other socket options. Behavior change: without a configured interface, multicast now leaves through the first operational non-loopback interface, which is the interface that subscribers join on, instead of the default multicast route. Tests (UdpDatagramTransportMulticastInterfaceTests): - The IPv4 and IPv6 egress options equal the resolved interface. Before the fix they were 0.0.0.0 and 0. - A publisher and subscriber pinned to the loopback interface exchange a payload; a raw control sender distinguishes a host without loopback multicast from a publisher that sends elsewhere. Red on Linux before the fix. Windows also delivers local copies sent on other interfaces, so there the test only confirms the exchange. Validation: Opc.Ua.PubSub.Udp.Tests net10.0 237/237 (Windows and a Linux container), net48 232/232; Opc.Ua.PubSub.Tests net10.0 1490 passed, 1 skipped; Release build of Opc.Ua.PubSub.Udp for all target frameworks with 0 warnings. The one-computer exchange in docs/PubSub.md delivers DataSets with the documented warning once, verified together with the separate sample KeyNonce fix that master currently needs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>