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[mdns] Reduce RAM usage by eliminating MAC address heap allocation (#12073)

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This commit is contained in:
J. Nick Koston
2025-12-09 09:33:23 -05:00
committed by GitHub
parent 861ed8dd41
commit f9aa48295c
11 changed files with 86 additions and 55 deletions
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esphome/components/mdns/mdns_component.cpp
+4 -2
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@@ -35,7 +35,7 @@ MDNS_STATIC_CONST_CHAR(SERVICE_TCP, "_tcp");
// Wrap build-time defines into flash storage
MDNS_STATIC_CONST_CHAR(VALUE_VERSION, ESPHOME_VERSION);
void MDNSComponent::compile_records_(StaticVector<MDNSService, MDNS_SERVICE_COUNT> &services) {
void MDNSComponent::compile_records_(StaticVector<MDNSService, MDNS_SERVICE_COUNT> &services, char *mac_address_buf) {
// IMPORTANT: The #ifdef blocks below must match COMPONENTS_WITH_MDNS_SERVICES
// in mdns/__init__.py. If you add a new service here, update both locations.
@@ -86,7 +86,9 @@ void MDNSComponent::compile_records_(StaticVector<MDNSService, MDNS_SERVICE_COUN
txt_records.push_back({MDNS_STR(TXT_FRIENDLY_NAME), MDNS_STR(friendly_name.c_str())});
}
txt_records.push_back({MDNS_STR(TXT_VERSION), MDNS_STR(VALUE_VERSION)});
txt_records.push_back({MDNS_STR(TXT_MAC), MDNS_STR(this->add_dynamic_txt_value(get_mac_address()))});
// MAC address: passed from caller (either member buffer or stack buffer depending on USE_MDNS_STORE_SERVICES)
txt_records.push_back({MDNS_STR(TXT_MAC), MDNS_STR(mac_address_buf)});
#ifdef USE_ESP8266
MDNS_STATIC_CONST_CHAR(PLATFORM_ESP8266, "ESP8266");