mdns_esp32.cpp

Go to the documentation of this file.

#include "esphome/core/defines.h"
#if defined(USE_ESP32) && defined(USE_MDNS)
 
#include <mdns.h>
#include <cstring>
#include "esphome/core/hal.h"
#include "esphome/core/log.h"
#include "mdns_component.h"
 
namespace esphome {
namespace mdns {
 
static const char *const TAG = "mdns";
 
void MDNSComponent::setup() {
  this->compile_records_();
 
  esp_err_t err = mdns_init();
  if (err != ESP_OK) {
    ESP_LOGW(TAG, "mDNS init failed: %s", esp_err_to_name(err));
    this->mark_failed();
    return;
  }
 
  mdns_hostname_set(this->hostname_.c_str());
  mdns_instance_name_set(this->hostname_.c_str());
 
  for (const auto &service : this->services_) {
    std::vector<mdns_txt_item_t> txt_records;
    for (const auto &record : service.txt_records) {
      mdns_txt_item_t it{};
      // dup strings to ensure the pointer is valid even after the record loop
      it.key = strdup(record.key.c_str());
      it.value = strdup(const_cast<TemplatableValue<std::string> &>(record.value).value().c_str());
      txt_records.push_back(it);
    }
    uint16_t port = const_cast<TemplatableValue<uint16_t> &>(service.port).value();
    err = mdns_service_add(nullptr, service.service_type.c_str(), service.proto.c_str(), port, txt_records.data(),
                           txt_records.size());
 
    // free records
    for (const auto &it : txt_records) {
      delete it.key;    // NOLINT(cppcoreguidelines-owning-memory)
      delete it.value;  // NOLINT(cppcoreguidelines-owning-memory)
    }
 
    if (err != ESP_OK) {
      ESP_LOGW(TAG, "Failed to register mDNS service %s: %s", service.service_type.c_str(), esp_err_to_name(err));
    }
  }
}
 
void MDNSComponent::on_shutdown() {
  mdns_free();
  delay(40);  // Allow the mdns packets announcing service removal to be sent
}
 
}  // namespace mdns
}  // namespace esphome
 
#endif  // USE_ESP32