esp_tls: Add warning if the CA chain provided contains one/more invalid

cert

components/esp-tls/esp_tls_mbedtls.c

@@ -275,6 +275,11 @@ static esp_err_t set_ca_cert(esp_tls_t *tls, const unsigned char *cacert, size_t
         ESP_INT_EVENT_TRACKER_CAPTURE(tls->error_handle, ESP_TLS_ERR_TYPE_MBEDTLS, -ret);
         return ESP_ERR_MBEDTLS_X509_CRT_PARSE_FAILED;
     }
+    if (ret > 0) {
+        /* This will happen if the CA chain contains one or more invalid certs, going ahead as the hadshake
+         * may still succeed if the other certificates in the CA chain are enough for the authentication */
+        ESP_LOGW(TAG, "mbedtls_x509_crt_parse was partly successful. No. of failed certificates: %d", ret);
+    }
     mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
     mbedtls_ssl_conf_ca_chain(&tls->conf, tls->cacert_ptr, NULL);
     return ESP_OK;