Heap optimization (espressif#471)

* Remove duplicated include * Clear certificates just after handshake It can save up to 7k of heap

Author: copercini

libraries/WiFiClientSecure/src/ssl_client.cpp

@@ -8,7 +8,6 @@
 
 #include "Arduino.h"
 #include <esp32-hal-log.h>
-#include <lwip/sockets.h>
 #include <lwip/err.h>
 #include <lwip/sockets.h>
 #include <lwip/sys.h>
@@ -181,6 +180,18 @@ int start_ssl_client(sslclient_context *ssl_client, uint32_t ipAddress, uint32_t
  } else {
  log_i("Certificate verified.");
  }
+ 
+ if (rootCABuff != NULL) {
+ mbedtls_x509_crt_free(&ssl_client->ca_cert);
+ }
+
+ if (cli_cert != NULL) {
+ mbedtls_x509_crt_free(&ssl_client->client_cert);
+ }
+
+ if (cli_key != NULL) {
+ mbedtls_pk_free(&ssl_client->client_key);
+ } 
 
  log_i("Free heap after TLS %u", xPortGetFreeHeapSize());
 
@@ -201,18 +212,6 @@ void stop_ssl_socket(sslclient_context *ssl_client, const char *rootCABuff, cons
  mbedtls_ssl_config_free(&ssl_client->ssl_conf);
  mbedtls_ctr_drbg_free(&ssl_client->drbg_ctx);
  mbedtls_entropy_free(&ssl_client->entropy_ctx);
-
- if (rootCABuff != NULL) {
- mbedtls_x509_crt_free(&ssl_client->ca_cert);
- }
-
- if (cli_cert != NULL) {
- mbedtls_x509_crt_free(&ssl_client->client_cert);
- }
-
- if (cli_key != NULL) {
- mbedtls_pk_free(&ssl_client->client_key);
- }
 }