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[udp] Avoid heap allocations when joining multicast groups (#12685)

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This commit is contained in:
J. Nick Koston
2026-01-02 14:13:26 -10:00
committed by GitHub
parent 023be88a87
commit e732f8469e
1 changed files with 5 additions and 2 deletions
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7
esphome/components/udp/udp_component.cpp
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@@ -65,11 +65,14 @@ void UDPComponent::setup() {
server.sin_port = htons(this->listen_port_); server.sin_port = htons(this->listen_port_);
if (this->listen_address_.has_value()) { if (this->listen_address_.has_value()) {
// Only 16 bytes needed for IPv4, but use standard size for consistency
char addr_buf[network::IP_ADDRESS_BUFFER_SIZE];
this->listen_address_.value().str_to(addr_buf);
struct ip_mreq imreq = {}; struct ip_mreq imreq = {};
imreq.imr_interface.s_addr = ESPHOME_INADDR_ANY; imreq.imr_interface.s_addr = ESPHOME_INADDR_ANY;
inet_aton(this->listen_address_.value().str().c_str(), &imreq.imr_multiaddr); inet_aton(addr_buf, &imreq.imr_multiaddr);
server.sin_addr.s_addr = imreq.imr_multiaddr.s_addr; server.sin_addr.s_addr = imreq.imr_multiaddr.s_addr;
ESP_LOGD(TAG, "Join multicast %s", this->listen_address_.value().str().c_str()); ESP_LOGD(TAG, "Join multicast %s", addr_buf);
err = this->listen_socket_->setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, &imreq, sizeof(imreq)); err = this->listen_socket_->setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, &imreq, sizeof(imreq));
if (err < 0) { if (err < 0) {
ESP_LOGE(TAG, "Failed to set IP_ADD_MEMBERSHIP. Error %d", errno); ESP_LOGE(TAG, "Failed to set IP_ADD_MEMBERSHIP. Error %d", errno);