Add network interface selection for multicast send/receive.#16
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tychedelia wants to merge 2 commits into
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Add network interface selection for multicast send/receive.#16tychedelia wants to merge 2 commits into
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SpaceK33z
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* feat(examples): allow selecting the multicast interface The send_multicast and receive_reassemble examples hardcoded INADDR_ANY, so on Windows a Wi-Fi interface is often not selected by default and PONK multicast never crosses the WLAN. Both examples now take an optional local interface IPv4 address: the sender binds to it to pin egress, the receiver joins the group on it. Omitting the address preserves the previous all-interfaces behavior; an unparseable address warns and falls back. Interface selection stays an application-level policy in the examples, keeping the codec socket-agnostic and unsafe-free. Ports the intent of madmappersoftware/Ponk#16 to this Rust crate's I/O-owning layer. * fix(examples): fail hard on an invalid interface address A typo in the interface argument silently reverted to INADDR_ANY — the exact default-selection behavior the argument exists to override — so the example looked broken over WLAN rather than reporting the typo. An invalid address is now a hard error; a missing argument still defaults to all interfaces. Also scope the sender's bind() comment: it reliably steers multicast egress on Windows, but binding a unicast source address is not IP_MULTICAST_IF and is only a hint on other platforms.
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We were testing PONK connectivity over WLAN between two computers from Modulaser into the default TouchDesigner receiver included in the repo and weren't able to get things working until I hard-coded the UDP socket to bind to my wifi interface. This is because on windows, wifi almost never has the correct metrics to be selected first when using
INADDR_ANY, which means our multicast messages don't get delivered.These changes switch to allowing both the sender and receiver to select a specific interface, falling back to default
INADDR_ANYbehavior. This mirrors other Touch UDP operators (e.g. Osc In/Out).I've tested this locally via multiple interfaces but haven't validated computer to computer for sure but things seem to work as expected.