ci(size_metrics): add more size metrics apps

tools/ci/metrics/size_metrics/size_metrics_config.yml

@@ -55,6 +55,11 @@ tools/test_apps/size_metrics/minimal_baseline:
   configs:
     - default
 
+tools/test_apps/size_metrics/wifi_ota:
+  libs: all
+  configs:
+    - default
+
 components/esp_timer/test_apps/size_metrics:
   libs: all
   configs:

tools/test_apps/size_metrics/.build-test-rules.yml

@@ -5,3 +5,8 @@ tools/test_apps/size_metrics/minimal_baseline:
     - if: IDF_TARGET == "linux"
       temporary: true
       reason: Not a real hardware target
+
+tools/test_apps/size_metrics/wifi_ota:
+  disable:
+    - if: SOC_WIFI_SUPPORTED != 1
+      reason: Wi-Fi is not supported

tools/test_apps/size_metrics/wifi_ota/CMakeLists.txt

@@ -0,0 +1,12 @@
+# This is the project CMakeLists.txt file for the wifi_ota size metrics test app
+cmake_minimum_required(VERSION 3.22)
+
+list(PREPEND SDKCONFIG_DEFAULTS
+     "$ENV{IDF_PATH}/tools/test_apps/configs/sdkconfig.size_metrics"
+     "sdkconfig.defaults")
+
+# "Trim" the build. Include the minimal set of components, main, and anything it depends on.
+set(COMPONENTS main)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(wifi_ota)

tools/test_apps/size_metrics/wifi_ota/README.md

@@ -0,0 +1,8 @@
+| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-H21 | ESP32-H4 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | --------- | -------- | -------- | -------- | -------- | --------- |
+
+# Wi-Fi OTA Size Metrics App
+
+This build-only app tracks the size of a minimal application using Wi-Fi and
+HTTPS OTA. It calls the production APIs so their implementations are retained
+by the linker, but it is intentionally skipped by the target-test pipeline.

tools/test_apps/size_metrics/wifi_ota/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "main.c"
+                       PRIV_REQUIRES esp_event esp_https_ota esp_netif esp_wifi mbedtls nvs_flash)

tools/test_apps/size_metrics/wifi_ota/main/main.c

@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include "esp_event.h"
+#include "esp_https_ota.h"
+#include "esp_netif.h"
+#include "esp_wifi.h"
+#include "nvs_flash.h"
+
+void app_main(void)
+{
+    ESP_ERROR_CHECK(nvs_flash_init());
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t wifi_config = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    esp_http_client_config_t http_config = {
+        .url = "https://example.invalid/firmware.bin",
+    };
+    esp_https_ota_config_t ota_config = {
+        .http_config = &http_config,
+    };
+    ESP_ERROR_CHECK(esp_https_ota(&ota_config));
+}

tools/test_apps/size_metrics/wifi_ota/pytest_wifi_ota.py

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+import pytest
+from pytest_embedded_idf.dut import IdfDut
+from pytest_embedded_idf.utils import idf_parametrize
+from pytest_embedded_idf.utils import soc_filtered_targets
+
+
+@pytest.mark.generic
+@pytest.mark.skip(reason='Build-only configuration used for size metrics')
+@pytest.mark.parametrize('config', ['default'], indirect=True)
+@idf_parametrize(
+    'target',
+    soc_filtered_targets('SOC_WIFI_SUPPORTED == 1', targets='supported_targets'),
+    indirect=['target'],
+)
+def test_wifi_ota_build_only(dut: IdfDut) -> None:
+    pass

tools/test_apps/size_metrics/wifi_ota/sdkconfig.defaults

@@ -0,0 +1,3 @@
+# App-specific defaults for the Wi-Fi OTA size metrics app
+CONFIG_PARTITION_TABLE_TWO_OTA=y
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y