add a handshake timeout, stop() should free the new clientCr and clientKey

arduino/libraries/WiFi/src/WiFiSSLClient.cpp

@@ -274,6 +274,10 @@ void WiFiSSLClient:: setPrivateKey(const char *private_key)
   _private_key = private_key;
 }
 
+void WiFiSSLClient::setHandshakeTimeout(unsigned long handshake_timeout)
+{
+  handshake_timeout = handshake_timeout * 1000;
+}
 
 void WiFiSSLClient::flush()
 {
@@ -287,6 +291,8 @@ void WiFiSSLClient::stop()
 
       mbedtls_net_free(&_netContext);
       mbedtls_x509_crt_free(&_caCrt);
+      mbedtls_x509_crt_free(&_clientCrt);
+      mbedtls_pk_free(&_clientKey);
       mbedtls_entropy_free(&_entropyContext);
       mbedtls_ssl_config_free(&_sslConfig);
       mbedtls_ctr_drbg_free(&_ctrDrbgContext);

arduino/libraries/WiFi/src/WiFiSSLClient.h

@@ -52,6 +52,7 @@ public:
   virtual operator bool();
   virtual void setCertificate(const char *client_ca);
   virtual void setPrivateKey (const char *private_key);
+  virtual void setHandshakeTimeout(unsigned long handshake_timeout);
 
   // using Print::write;
 
@@ -73,6 +74,7 @@ private:
   mbedtls_pk_context _clientKey;
   bool _connected;
   int _peek;
+  unsigned long handshake_timeout;
 
   SemaphoreHandle_t _mbedMutex;
 };