mbedtls: Add some initial menuconfig options

components/mbedtls/Kconfig

@@ -0,0 +1,37 @@
+menu "mbedTLS"
+
+config MBEDTLS_SSL_MAX_CONTENT_LEN
+    int "TLS maximum message content length"
+	default 16384
+    range 512 16384
+    help
+        Maximum TLS message length (in bytes) supported by mbedTLS.
+        
+        16384 is the default and this value is required to comply
+        fully with TLS standards.
+        
+        However you can set a lower value in order to save RAM. This
+        is safe if the other end of the connection supports Maximum
+        Fragment Length Negotiation Extension (max_fragment_length,
+        see RFC6066) or you know for certain that it will never send a
+        message longer than a certain number of bytes.
+        
+        If the value is set too low, symptoms are a failed TLS
+        handshake or a return value of MBEDTLS_ERR_SSL_INVALID_RECORD
+        (-0x7200).
+
+config MBEDTLS_DEBUG
+   bool "Enable mbedTLS debugging"
+   default "no"
+   help
+       Enable mbedTLS debugging functions.
+       
+       If this option is enabled, use the mbedtls_debug_set_threshold()
+       and mbedtls_ssl_conf_dbg() functions to obtain debugging output
+       from mbedTLS.
+       
+       Note thatm mbedTLS debugging is not related to the ESP logging
+       functionality. See the "https_request_main" example for a
+       sample function which connects the two together.
+
+endmenu

components/mbedtls/port/include/mbedtls/esp_config.h

@@ -27,6 +27,8 @@
 #ifndef MBEDTLS_CONFIG_H
 #define MBEDTLS_CONFIG_H
 
+#include "sdkconfig.h"
+
 #if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
 #define _CRT_SECURE_NO_DEPRECATE 1
 #endif
@@ -1659,7 +1661,9 @@
  *
  * This module provides debugging functions.
  */
+#if CONFIG_MBEDTLS_DEBUG
 #define MBEDTLS_DEBUG_C
+#endif
 
 /**
  * \def MBEDTLS_DES_C
@@ -2481,7 +2485,7 @@
 
 /* SSL options */
 
-#define MBEDTLS_SSL_MAX_CONTENT_LEN             5120 /**< Maxium fragment length in bytes, determines the size of each of the two internal I/O buffers */
+#define MBEDTLS_SSL_MAX_CONTENT_LEN             CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN /**< Maxium fragment length in bytes, determines the size of each of the two internal I/O buffers */
 //#define MBEDTLS_SSL_DEFAULT_TICKET_LIFETIME     86400 /**< Lifetime of session tickets (if enabled) */
 //#define MBEDTLS_PSK_MAX_LEN               32 /**< Max size of TLS pre-shared keys, in bytes (default 256 bits) */
 //#define MBEDTLS_SSL_COOKIE_TIMEOUT        60 /**< Default expiration delay of DTLS cookies, in seconds if HAVE_TIME, or in number of cookies issued */