　とりあえず、確認したいのはmDNSでのアナウンスができるかということと、AWS IoT CoreでMQTTする手順だったりする。どちらも標準環境で含まれているはず。

　サンプルを漁ってみる。

% ls $IDF_PATH/examples/

　README.md ieee802154 provisioning

　bluetooth lowpower security

　build_system mesh storage

　common_components network system

　custom_bootloader openthread wifi

　cxx peripherals zigbee

　ethernet phy

　get-started protocols

　MQTTのほうは、mqttとmqtt5がある。

% ls $IDF_PATH/examples/protocols

　README.md https_request mqtt

　dns_over_https https_server mqtt5

　esp_http_client https_x509_bundle smtp_client

　esp_local_ctrl icmp_echo sntp

　http_request l2tap sockets

　http_server linux_stubs static_ip

　https_mbedtls modbus

% ls $IDF_PATH/examples/protocols/mqtt

　custom_outbox ssl_ds ssl_psk ws

　ssl ssl_mutual_auth tcp wss

% ls $IDF_PATH/examples/protocols/mqtt5

　CMakeLists.txt main sdkconfig.ci

　README.md pytest_mqtt5.py sdkconfig.defaults

　mDNSのほうはサンプルは特になさそうね。作ってみるか。

　プロジェクトを作成する。

% cd ~/Downloads/esp

% idf.py create-project mdns_check

　Executing action: create-project

　The project was created in /Users/kinneko/Downloads/esp/mdns_check

% cd mdns_check

　ターゲットを追加。

% idf.py set-target esp32s3

　Adding "set-target"'s dependency "fullclean" to list of commands with default set of options.

　Executing action: fullclean

　Build directory '/Users/kinneko/Downloads/esp/mdns_check/build' not found. Nothing to clean.

　Executing action: set-target

　Set Target to: esp32s3, new sdkconfig will be created.

　Running cmake in directory /Users/kinneko/Downloads/esp/mdns_check/build

　Executing "cmake -G Ninja -DPYTHON_DEPS_CHECKED=1 -DPYTHON=/Users/kinneko/.espressif/python_env/idf5.5_py3.13_env/bin/python -DESP_PLATFORM=1 -DIDF_TARGET=esp32s3 -DCCACHE_ENABLE=0 /Users/kinneko/Downloads/esp/mdns_check"...

-- Found Git: /usr/bin/git (found version "2.39.3 (Apple Git-146)")

-- Minimal build - OFF

-- The C compiler identification is GNU 14.2.0

-- The CXX compiler identification is GNU 14.2.0

-- The ASM compiler identification is GNU

-- Found assembler: /Users/kinneko/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20251107/xtensa-esp-elf/bin/xtensa-esp32s3-elf-gcc

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Check for working C compiler: /Users/kinneko/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20251107/xtensa-esp-elf/bin/xtensa-esp32s3-elf-gcc - skipped

-- Detecting C compile features

-- Detecting C compile features - done

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

-- Check for working CXX compiler: /Users/kinneko/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20251107/xtensa-esp-elf/bin/xtensa-esp32s3-elf-g++ - skipped

-- Detecting CXX compile features

-- Detecting CXX compile features - done

-- git rev-parse returned 'fatal: not a git repository (or any of the parent directories): .git'

-- Could not use 'git describe' to determine PROJECT_VER.

-- Building ESP-IDF components for target esp32s3

-- ESP-TEE is currently supported only on the esp32c6;esp32h2;esp32c5 SoCs

-- Project sdkconfig file /Users/kinneko/Downloads/esp/mdns_check/sdkconfig

-- Compiler supported targets: xtensa-esp-elf

-- Found Python3: /Users/kinneko/.espressif/python_env/idf5.5_py3.13_env/bin/python (found version "3.13.5") found components: Interpreter

-- Performing Test CMAKE_HAVE_LIBC_PTHREAD

-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success

-- Found Threads: TRUE

-- Performing Test C_COMPILER_SUPPORTS_WFORMAT_SIGNEDNESS

-- Performing Test C_COMPILER_SUPPORTS_WFORMAT_SIGNEDNESS - Success

-- USING O3

-- App "mdns_check" version: 1

-- Adding linker script /Users/kinneko/Downloads/esp/mdns_check/build/esp-idf/esp_system/ld/memory.ld

-- Adding linker script /Users/kinneko/Downloads/esp/mdns_check/build/esp-idf/esp_system/ld/sections.ld.in

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.api.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.bt_funcs.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.libgcc.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.wdt.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.version.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_master.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_50.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_smp.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_dtm.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_test.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.ble_scan.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.libc.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom/esp32s3/ld/esp32s3.rom.newlib.ld

-- Adding linker script /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/soc/esp32s3/ld/esp32s3.peripherals.ld

-- Components: app_trace app_update bootloader bootloader_support bt cmock console cxx driver efuse esp-tls esp_adc esp_app_format esp_bootloader_format esp_coex esp_common esp_driver_ana_cmpr esp_driver_bitscrambler esp_driver_cam esp_driver_dac esp_driver_gpio esp_driver_gptimer esp_driver_i2c esp_driver_i2s esp_driver_isp esp_driver_jpeg esp_driver_ledc esp_driver_mcpwm esp_driver_parlio esp_driver_pcnt esp_driver_ppa esp_driver_rmt esp_driver_sdio esp_driver_sdm esp_driver_sdmmc esp_driver_sdspi esp_driver_spi esp_driver_touch_sens esp_driver_tsens esp_driver_twai esp_driver_uart esp_driver_usb_serial_jtag esp_eth esp_event esp_gdbstub esp_hid esp_http_client esp_http_server esp_https_ota esp_https_server esp_hw_support esp_lcd esp_local_ctrl esp_mm esp_netif esp_netif_stack esp_partition esp_phy esp_pm esp_psram esp_ringbuf esp_rom esp_security esp_system esp_timer esp_vfs_console esp_wifi espcoredump esptool_py fatfs freertos hal heap http_parser idf_test ieee802154 json log lwip main mbedtls mqtt newlib nvs_flash nvs_sec_provider openthread partition_table perfmon protobuf-c protocomm pthread rt sdmmc soc spi_flash spiffs tcp_transport touch_element ulp unity usb vfs wear_levelling wifi_provisioning wpa_supplicant xtensa

-- Component paths: /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/app_trace /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/app_update /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/bootloader /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/bootloader_support /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/bt /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/cmock /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/console /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/cxx /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/driver /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/efuse /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp-tls /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_adc /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_app_format /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_bootloader_format /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_coex /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_common /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_ana_cmpr /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_bitscrambler /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_cam /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_dac /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_gpio /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_gptimer /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_i2c /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_i2s /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_isp /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_jpeg /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_ledc /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_mcpwm /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_parlio /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_pcnt /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_ppa /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_rmt /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_sdio /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_sdm /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_sdmmc /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_sdspi /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_spi /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_touch_sens /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_tsens /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_twai /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_uart /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_driver_usb_serial_jtag /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_eth /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_event /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_gdbstub /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_hid /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_http_client /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_http_server /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_https_ota /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_https_server /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_hw_support /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_lcd /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_local_ctrl /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_mm /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_netif /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_netif_stack /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_partition /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_phy /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_pm /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_psram /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_ringbuf /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_rom /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_security /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_system /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_timer /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_vfs_console /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esp_wifi /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/espcoredump /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/esptool_py /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/fatfs /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/freertos /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/hal /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/heap /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/http_parser /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/idf_test /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/ieee802154 /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/json /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/log /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/lwip /Users/kinneko/Downloads/esp/mdns_check/main /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/mbedtls /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/mqtt /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/newlib /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/nvs_flash /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/nvs_sec_provider /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/openthread /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/partition_table /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/perfmon /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/protobuf-c /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/protocomm /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/pthread /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/rt /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/sdmmc /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/soc /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/spi_flash /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/spiffs /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/tcp_transport /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/touch_element /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/ulp /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/unity /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/usb /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/vfs /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/wear_levelling /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/wifi_provisioning /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/wpa_supplicant /Users/kinneko/Downloads/esp-idf/esp-idf-v5.5.2/components/xtensa

-- Configuring done (12.2s)

-- Generating done (0.3s)

-- Build files have been written to: /Users/kinneko/Downloads/esp/mdns_check/build

　mDNSコンポーネントの追加。

　ESP-IDF v5.0以降は、mDNSが別リポジトリに移動しているようなので、コンポーネントとして追加してやる必要がある。

% idf.py add-dependency espressif/mdns

　Executing action: add-dependency

　NOTICE: Created "/Users/kinneko/Downloads/esp/mdns_check/main/idf_component.yml"

　NOTICE: Successfully added dependency "espressif/mdns": "*" to component "main"

　NOTICE: If you want to make additional changes to the manifest file at path /Users/kinneko/Downloads/esp/mdns_check/main/idf_component.yml manually, please refer to the documentation: https://docs.espressif.com/projects/idf-component-manager/en/latest/reference/manifest_file.html

　CMakeLists.txtに設定された。

% cat main/CMakeLists.txt

　idf_component_register(SRCS "mdns_check.c"

　INCLUDE_DIRS ".")

　menuconfigでWi-Fi設定を登録するために、menuconfig用のテンプレートを作っておく。

% vi main/Kconfig.projbuild

　menu "mDNS Check Configuration"

　config WIFI_SSID

　string "WiFi SSID"

　default ""

　config WIFI_PASSWORD

　string "WiFi Password"

　default ""

　config MDNS_HOSTNAME

　string "mDNS hostname"

　default "esp32-mdns"

　endmenu

　menuconfigで設定する。

% idf.py menuconfig

　mDNS Check Configurationが生えているのが確認できる。

　Kconfig.projbuildを作ってない場合はメニューに出ない。

　評価環境のSSIDとパスワードを入力しておく。mDNS名はこのままでいいだろう。

　sキーで設定が保存される。qキーで終了。

　保存した内容はsdkconfigに登録されている。

% cat sdkconfig| grep CONFIG_MDNS_HOSTNAME

　CONFIG_MDNS_HOSTNAME="esp32-mdns"

　メインのコードを書く。

% vi main/mdns_check.c

#include <string.h>

#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "esp_log.h"

#include "esp_event.h"

#include "nvs_flash.h"

#include "esp_netif.h"

#include "esp_wifi.h"

#include "mdns.h"

　static const char *TAG = "mdns_check";

　static void start_mdns(void)

　{

　ESP_ERROR_CHECK(mdns_init());

// hostname.local になる

　ESP_ERROR_CHECK(mdns_hostname_set(CONFIG_MDNS_HOSTNAME));

　ESP_ERROR_CHECK(mdns_instance_name_set("ESP-IDF mDNS Check"));

// 動作確認用：HTTPサービスを広告（実サーバは立てなくてもOK）

　ESP_ERROR_CHECK(mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0));

// TXTレコード（任意）

　mdns_txt_item_t txt[] = {

　{"board", "esp32"},

　{"app", "mdns_check"},

　};

　ESP_ERROR_CHECK(mdns_service_txt_set("_http", "_tcp", txt, 2));

　ESP_LOGI(TAG, "mDNS started: %s.local", CONFIG_MDNS_HOSTNAME);

　ESP_LOGI(TAG, "Service: _http._tcp on port 80");

　}

　static void wifi_event_handler(void *arg, esp_event_base_t event_base,

　int32_t event_id, void *event_data)

　{

　(void)arg;

　(void)event_data;

　if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {

　ESP_LOGI(TAG, "Wi-Fi start -> connect");

　esp_wifi_connect();

　} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {

　ESP_LOGW(TAG, "Wi-Fi disconnected -> reconnect");

　esp_wifi_connect();

　} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {

　ESP_LOGI(TAG, "Got IP -> start mDNS");

　start_mdns();

　}

　static void wifi_init_sta(void)

　{

　esp_netif_create_default_wifi_sta();

　wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();

　ESP_ERROR_CHECK(esp_wifi_init(&cfg));

　ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL));

　ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &wifi_event_handler, NULL));

　wifi_config_t wifi_config = {0};

　strncpy((char *)wifi_config.sta.ssid, CONFIG_WIFI_SSID, sizeof(wifi_config.sta.ssid));

　strncpy((char *)wifi_config.sta.password, CONFIG_WIFI_PASSWORD, sizeof(wifi_config.sta.password));

　wifi_config.sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;

　ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));

　ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));

　ESP_ERROR_CHECK(esp_wifi_start());

　}

　void app_main(void)

　{

　ESP_ERROR_CHECK(nvs_flash_init());

　ESP_ERROR_CHECK(esp_netif_init());

　ESP_ERROR_CHECK(esp_event_loop_create_default());

　wifi_init_sta();

// 何もしないで待つ（イベント駆動）

　while (1) {

　vTaskDelay(pdMS_TO_TICKS(1000));

　}

　ビルドしてみる。

% idf.py build

　Executing action: all (aliases: build)

　Running ninja in directory /Users/kinneko/Downloads/esp/mdns_check/build

　Executing "ninja all"...

　[0/1] Re-running CMake...

-- Minimal build - OFF

-- git rev-parse returned 'fatal: not a git repository (or any of the parent directories): .git'

-- Could not use 'git describe' to determine PROJECT_VER.

-- Building ESP-IDF components for target esp32s3

　NOTICE: Processing 2 dependencies:

　NOTICE: [1/2] espressif/mdns (1.9.1)

　NOTICE: [2/2] idf (5.5.2)