esp_http_client: Added support to set server common name.

components/esp_http_client/esp_http_client.c

@@ -670,6 +670,10 @@ esp_http_client_handle_t esp_http_client_init(const esp_http_client_config_t *co
     if (config->skip_cert_common_name_check) {
         esp_transport_ssl_skip_common_name_check(ssl);
     }
+
+    if (config->common_name) {
+        esp_transport_ssl_set_common_name(ssl, config->common_name);
+    }
 #endif
 
     if (_set_config(client, config) != ESP_OK) {

components/esp_http_client/include/esp_http_client.h

@@ -129,6 +129,9 @@ typedef struct {
     bool                        is_async;                 /*!< Set asynchronous mode, only supported with HTTPS for now */
     bool                        use_global_ca_store;      /*!< Use a global ca_store for all the connections in which this bool is set. */
     bool                        skip_cert_common_name_check;    /*!< Skip any validation of server certificate CN field */
+    const char                  *common_name;             /*!< Pointer to the string containing server certificate common name.
+                                                               If non-NULL, server certificate CN must match this name,
+                                                               If NULL, server certificate CN must match hostname. */
     esp_err_t (*crt_bundle_attach)(void *conf);      /*!< Function pointer to esp_crt_bundle_attach. Enables the use of certification
                                                           bundle for server verification, must be enabled in menuconfig */
     bool                        keep_alive_enable;   /*!< Enable keep-alive timeout */