examples: add dependency on cert bundle configuration

Refactor examples to build with MBEDTLS_CERTIFICATE_BUNDLE disabled. Only examples
that can work with certificate bundle disabled have been modified here.

examples/protocols/esp_http_client/main/esp_http_client_example.c

@@ -18,7 +18,9 @@
 #include "esp_netif.h"
 #include "protocol_examples_common.h"
 #include "esp_tls.h"
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 #include "esp_crt_bundle.h"
+#endif
 
 #include "esp_http_client.h"
 
@@ -372,6 +374,7 @@ static void http_auth_digest(void)
 }
 #endif
 
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 static void https_with_url(void)
 {
     esp_http_client_config_t config = {
@@ -391,6 +394,7 @@ static void https_with_url(void)
     }
     esp_http_client_cleanup(client);
 }
+#endif // CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 
 static void https_with_hostname_path(void)
 {
@@ -667,6 +671,7 @@ static void http_native_request(void)
     esp_http_client_cleanup(client);
 }
 
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 static void http_partial_download(void)
 {
     esp_http_client_config_t config = {
@@ -711,6 +716,7 @@ static void http_partial_download(void)
 
     esp_http_client_cleanup(client);
 }
+#endif // CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 
 static void http_test_task(void *pvParameters)
 {
@@ -726,7 +732,9 @@ static void http_test_task(void *pvParameters)
     http_relative_redirect();
     http_absolute_redirect();
     http_absolute_redirect_manual();
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
     https_with_url();
+#endif
     https_with_hostname_path();
     http_redirect_to_https();
     http_download_chunk();
@@ -734,7 +742,9 @@ static void http_test_task(void *pvParameters)
     https_async();
     https_with_invalid_url();
     http_native_request();
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
     http_partial_download();
+#endif
 
     ESP_LOGI(TAG, "Finish http example");
     vTaskDelete(NULL);

examples/protocols/https_request/main/https_request_example_main.c

@@ -5,22 +5,13 @@
  *
  * Adapted from the ssl_client1 example in mbedtls.
  *
- * Original Copyright (C) 2006-2016, ARM Limited, All Rights Reserved, Apache 2.0 License.
- * Additions Copyright (C) Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD, Apache 2.0 License.
+ * SPDX-FileCopyrightText: 2006-2016 ARM Limited, All Rights Reserved
  *
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * SPDX-FileContributor: 2015-2022 Espressif Systems (Shanghai) CO LTD
  */
+
 #include <string.h>
 #include <stdlib.h>
 #include <time.h>
@@ -45,7 +36,9 @@
 #include "lwip/dns.h"
 
 #include "esp_tls.h"
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 #include "esp_crt_bundle.h"
+#endif
 #include "time_sync.h"
 
 /* Constants that aren't configurable in menuconfig */
@@ -166,6 +159,7 @@ exit:
     }
 }
 
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 static void https_get_request_using_crt_bundle(void)
 {
     ESP_LOGI(TAG, "https_request using crt bundle");
@@ -174,8 +168,7 @@ static void https_get_request_using_crt_bundle(void)
     };
     https_get_request(cfg, WEB_URL, HOWSMYSSL_REQUEST);
 }
-
-
+#endif // CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
 
 static void https_get_request_using_cacert_buf(void)
 {
@@ -255,7 +248,9 @@ static void https_request_task(void *pvparameters)
     https_get_request_using_already_saved_session(server_url);
 #endif
 
+#if CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
     https_get_request_using_crt_bundle();
+#endif
     printf("Minimum free heap size: %d bytes\n", esp_get_minimum_free_heap_size());
     https_get_request_using_cacert_buf();
     https_get_request_using_global_ca_store();

examples/system/ota/simple_ota_example/main/Kconfig.projbuild

@@ -10,6 +10,7 @@ menu "Example Configuration"
     config EXAMPLE_USE_CERT_BUNDLE
         bool "Enable certificate bundle"
         default y
+        depends on MBEDTLS_CERTIFICATE_BUNDLE
         help
             Enable trusted root certificate bundle. This approach allows to have
             OTA updates functional with any public server without requirement