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Fix UDP transmit on Windows

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This commit is contained in:
Johnathon Slightham
2026-03-04 06:31:27 -05:00
parent 7cd9f1986f
commit 8a5b545573
1 changed files with 17 additions and 1 deletions
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18
src/UDPClient.cpp
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@@ -85,7 +85,7 @@ int UDPClient::init() {
mreq.imr_interface.s_addr = INADDR_ANY; mreq.imr_interface.s_addr = INADDR_ANY;
#ifdef _WIN32 #ifdef _WIN32
// Get hostname, resolve to primary IPv4 (won't work for all cases) // Get hostname, resolve to primary IPv4
char hostname[256]; char hostname[256];
gethostname(hostname, sizeof(hostname)); gethostname(hostname, sizeof(hostname));
hostent *host = gethostbyname(hostname); hostent *host = gethostbyname(hostname);
@@ -103,6 +103,22 @@ int UDPClient::init() {
deinit(); deinit();
return -1; return -1;
} }
in_addr tx_iface{};
tx_iface.s_addr = mreq.imr_interface.s_addr;
if (setsockopt(m_tx_socket, IPPROTO_IP, IP_MULTICAST_IF, (char *)&tx_iface, sizeof(tx_iface)) < 0) {
spdlog::error("[UDP] Failed to set multicast TX interface");
print_errno();
deinit();
return -1;
}
// Set multicast TTL > 1 so packets leave the local subnet if needed (default is 1).
constexpr int mcast_ttl = 32;
if (setsockopt(m_tx_socket, IPPROTO_IP, IP_MULTICAST_TTL, (char *)&mcast_ttl, sizeof(mcast_ttl)) < 0) {
spdlog::warn("[UDP] Failed to set multicast TTL");
print_errno();
}
#else #else
setsockopt(m_rx_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)); setsockopt(m_rx_socket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
#endif #endif