diff --git a/components/ssl/Kconfig b/components/ssl/Kconfig
index 719feee8..8ac28716 100644
--- a/components/ssl/Kconfig
+++ b/components/ssl/Kconfig
@@ -48,6 +48,14 @@ config MBEDTLS_DEBUG
        If this option is enabled, you must call mbedtls_esp_enable_debug_log
 	   at runtime in order to enable mbedTLS debug output.
 
+config MBEDTLS_DEBUG_LEVEL
+   int "Mbedtls debugging level"
+   default 4
+   range 0 4
+   depends on MBEDTLS_DEBUG
+   help
+       Mbedtls debugging level.
+
 config MBEDTLS_HAVE_TIME
    bool "Enable mbedtls time"
    default y
@@ -475,6 +483,77 @@ config MBEDTLS_ECP_NIST_OPTIM
 
 # end of Elliptic Curve options
 
+menu "OpenSSL"
+
+config OPENSSL_DEBUG
+    bool "Enable OpenSSL debugging"
+    default n
+    help
+       Enable OpenSSL debugging function.
+
+       If the option is enabled, "SSL_DEBUG" works.
+
+config OPENSSL_DEBUG_LEVEL
+   int "OpenSSL debugging level"
+   default 0
+   range 0 255
+   depends on OPENSSL_DEBUG
+   help
+       OpenSSL debugging level.
+
+       Only function whose debugging level is higher than "OPENSSL_DEBUG_LEVEL" works.
+
+       For example:
+           If OPENSSL_DEBUG_LEVEL = 2, you use function "SSL_DEBUG(1, "malloc failed")". Because 1 < 2, it will not print.
+
+config OPENSSL_LOWLEVEL_DEBUG
+    bool "Enable OpenSSL low-level module debugging"
+    default n
+    depends on OPENSSL_DEBUG
+    select MBEDTLS_DEBUG
+    help
+       If the option is enabled, low-level module debugging function of OpenSSL is enabled, e.g. mbedtls internal debugging function.
+
+choice OPENSSL_ASSERT
+    prompt "Select OpenSSL assert function"
+    default CONFIG_OPENSSL_ASSERT_EXIT
+    help
+        OpenSSL function needs "assert" function to check if input parameters are valid.
+
+        If you want to use assert debugging function, "OPENSSL_DEBUG" should be enabled.
+
+config OPENSSL_ASSERT_DO_NOTHING
+    bool "Do nothing"
+    help
+        Do nothing and "SSL_ASSERT" does not work.
+
+config OPENSSL_ASSERT_EXIT
+    bool "Check and exit"
+    help
+        Enable assert exiting, it will check and return error code.
+
+config OPENSSL_ASSERT_DEBUG
+    bool "Show debugging message"
+    depends on OPENSSL_DEBUG
+    help
+        Enable assert debugging, it will check and show debugging message.
+
+config OPENSSL_ASSERT_DEBUG_EXIT
+    bool "Show debugging message and exit"
+    depends on OPENSSL_DEBUG
+    help
+        Enable assert debugging and exiting, it will check, show debugging message and return error code.
+
+config OPENSSL_ASSERT_DEBUG_BLOCK
+    bool "Show debugging message and block"
+    depends on OPENSSL_DEBUG
+    help
+        Enable assert debugging and blocking, it will check, show debugging message and block by "while (1);".
+
+endchoice
+
+endmenu
+
 endmenu  # mbedTLS
 
 endmenu
diff --git a/components/ssl/mbedtls/mbedtls/library/net_sockets.c b/components/ssl/mbedtls/mbedtls/library/net_sockets.c
index 345f1022..b1e8f41d 100644
--- a/components/ssl/mbedtls/mbedtls/library/net_sockets.c
+++ b/components/ssl/mbedtls/mbedtls/library/net_sockets.c
@@ -183,7 +183,7 @@ int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host,
  */
 int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto )
 {
-    int n, ret;
+    int ret;
     struct addrinfo hints, *addr_list, *cur;
 
     if( ( ret = net_prepare() ) != 0 )
diff --git a/components/ssl/mbedtls/port/openssl/include/internal/ssl_dbg.h b/components/ssl/mbedtls/port/openssl/include/internal/ssl_dbg.h
index 12ba25f9..e3e1b144 100644
--- a/components/ssl/mbedtls/port/openssl/include/internal/ssl_dbg.h
+++ b/components/ssl/mbedtls/port/openssl/include/internal/ssl_dbg.h
@@ -17,6 +17,7 @@
 
 #include "platform/ssl_opt.h"
 #include "platform/ssl_port.h"
+#include "sdkconfig.h"
 
 #ifdef __cplusplus
  extern "C" {
diff --git a/components/ssl/mbedtls/port/openssl/include/internal/ssl_methods.h b/components/ssl/mbedtls/port/openssl/include/internal/ssl_methods.h
index bd3b1640..3ba6a63a 100644
--- a/components/ssl/mbedtls/port/openssl/include/internal/ssl_methods.h
+++ b/components/ssl/mbedtls/port/openssl/include/internal/ssl_methods.h
@@ -29,7 +29,6 @@
                     handshake, shutdown, clear, \
                     read, send, pending, \
                     set_fd, get_fd, \
-                    set_bufflen, \
                     get_verify_result, \
                     get_state) \
         static const SSL_METHOD_FUNC func_name = { \
@@ -43,7 +42,6 @@
                 pending, \
                 set_fd, \
                 get_fd, \
-                set_bufflen, \
                 get_verify_result, \
                 get_state \
         };
diff --git a/components/ssl/mbedtls/port/openssl/include/internal/ssl_types.h b/components/ssl/mbedtls/port/openssl/include/internal/ssl_types.h
index 5aaee941..633b1f18 100644
--- a/components/ssl/mbedtls/port/openssl/include/internal/ssl_types.h
+++ b/components/ssl/mbedtls/port/openssl/include/internal/ssl_types.h
@@ -170,8 +170,6 @@ struct ssl_ctx_st
 
     int read_ahead;
 
-    int read_buffer_len;
-
     X509_VERIFY_PARAM param;
 };
 
@@ -250,8 +248,6 @@ struct ssl_method_func_st {
 
     int (*ssl_get_fd)(const SSL *ssl, int mode);
 
-    void (*ssl_set_bufflen)(SSL *ssl, int len);
-
     long (*ssl_get_verify_result)(const SSL *ssl);
 
     OSSL_HANDSHAKE_STATE (*ssl_get_state)(const SSL *ssl);
diff --git a/components/ssl/mbedtls/port/openssl/include/internal/ssl_x509.h b/components/ssl/mbedtls/port/openssl/include/internal/ssl_x509.h
index 840fbf1e..334455ca 100644
--- a/components/ssl/mbedtls/port/openssl/include/internal/ssl_x509.h
+++ b/components/ssl/mbedtls/port/openssl/include/internal/ssl_x509.h
@@ -87,6 +87,19 @@ int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x);
  */
 int SSL_add_client_CA(SSL *ssl, X509 *x);
 
+
+/**
+ * @brief add CA client certification into the CTX
+ *
+ * @param ctx - SSL context point
+ * @param buffer - a point pointed to the certification context memory point
+ *
+ * @return result
+ *     0 : failed
+ *     1 : OK
+ */
+int SSL_CTX_load_verify_buffer(SSL_CTX *ctx, const unsigned char* buffer, long len);
+
 /**
  * @brief load certification into the SSL
  *
diff --git a/components/ssl/mbedtls/port/openssl/include/openssl/ssl.h b/components/ssl/mbedtls/port/openssl/include/openssl/ssl.h
index e367f194..b04eaa66 100644
--- a/components/ssl/mbedtls/port/openssl/include/openssl/ssl.h
+++ b/components/ssl/mbedtls/port/openssl/include/openssl/ssl.h
@@ -635,26 +635,6 @@ void SSL_set_info_callback(SSL *ssl, void (*cb) (const SSL *ssl, int type, int v
  */
 OSSL_HANDSHAKE_STATE SSL_get_state(const SSL *ssl);
 
-/**
- * @brief set the SSL context read buffer length
- *
- * @param ctx - SSL context point
- * @param len - read buffer length
- *
- * @return none
- */
-void SSL_CTX_set_default_read_buffer_len(SSL_CTX *ctx, size_t len);
-
-/**
- * @brief set the SSL read buffer length
- *
- * @param ssl - SSL point
- * @param len - read buffer length
- *
- * @return none
- */
-void SSL_set_default_read_buffer_len(SSL *ssl, size_t len);
-
 /**
  * @brief set the SSL security level
  *
diff --git a/components/ssl/mbedtls/port/openssl/include/platform/ssl_pm.h b/components/ssl/mbedtls/port/openssl/include/platform/ssl_pm.h
index e6ce49bf..e05e05cd 100644
--- a/components/ssl/mbedtls/port/openssl/include/platform/ssl_pm.h
+++ b/components/ssl/mbedtls/port/openssl/include/platform/ssl_pm.h
@@ -39,8 +39,6 @@ int ssl_pm_get_fd(const SSL *ssl, int mode);
 
 OSSL_HANDSHAKE_STATE ssl_pm_get_state(const SSL *ssl);
 
-void ssl_pm_set_bufflen(SSL *ssl, int len);
-
 int x509_pm_show_info(X509 *x);
 int x509_pm_new(X509 *x, X509 *m_x);
 void x509_pm_free(X509 *x);
diff --git a/components/ssl/mbedtls/port/openssl/source/library/ssl_lib.c b/components/ssl/mbedtls/port/openssl/source/library/ssl_lib.c
index 43c13007..ce189a8d 100644
--- a/components/ssl/mbedtls/port/openssl/source/library/ssl_lib.c
+++ b/components/ssl/mbedtls/port/openssl/source/library/ssl_lib.c
@@ -1308,27 +1308,6 @@ char *SSL_state_string_long(const SSL *ssl)
     return str;
 }
 
-/**
- * @brief set the SSL context read buffer length
- */
-void SSL_CTX_set_default_read_buffer_len(SSL_CTX *ctx, size_t len)
-{
-    SSL_ASSERT3(ctx);
-
-    ctx->read_buffer_len = len;
-}
-
-/**
- * @brief set the SSL read buffer length
- */
-void SSL_set_default_read_buffer_len(SSL *ssl, size_t len)
-{
-    SSL_ASSERT3(ssl);
-    SSL_ASSERT3(len);
-
-    SSL_METHOD_CALL(set_bufflen, ssl, len);
-}
-
 /**
  * @brief set the SSL information callback function
  */
diff --git a/components/ssl/mbedtls/port/openssl/source/library/ssl_methods.c b/components/ssl/mbedtls/port/openssl/source/library/ssl_methods.c
index 00023608..9abeac57 100644
--- a/components/ssl/mbedtls/port/openssl/source/library/ssl_methods.c
+++ b/components/ssl/mbedtls/port/openssl/source/library/ssl_methods.c
@@ -23,7 +23,6 @@ IMPLEMENT_TLS_METHOD_FUNC(TLS_method_func,
         ssl_pm_handshake, ssl_pm_shutdown, ssl_pm_clear,
         ssl_pm_read, ssl_pm_send, ssl_pm_pending,
         ssl_pm_set_fd, ssl_pm_get_fd,
-        ssl_pm_set_bufflen,
         ssl_pm_get_verify_result,
         ssl_pm_get_state);
 
diff --git a/components/ssl/mbedtls/port/openssl/source/library/ssl_x509.c b/components/ssl/mbedtls/port/openssl/source/library/ssl_x509.c
index ef0503c0..b6cc8983 100644
--- a/components/ssl/mbedtls/port/openssl/source/library/ssl_x509.c
+++ b/components/ssl/mbedtls/port/openssl/source/library/ssl_x509.c
@@ -153,6 +153,24 @@ int SSL_add_client_CA(SSL *ssl, X509 *x)
     return 1;
 }
 
+/**
+ * @brief add CA client certification into the CTX
+ */
+int SSL_CTX_load_verify_buffer(SSL_CTX *ctx, const unsigned char* buffer, long len)
+{
+    SSL_ASSERT1(ctx);
+    SSL_ASSERT1(buffer);
+
+    X509* cacrt = d2i_X509(NULL, buffer, len);
+
+    if (cacrt) {
+        SSL_CTX_add_client_CA(ctx, cacrt);
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
 /**
  * @brief set the SSL context certification
  */
diff --git a/components/ssl/mbedtls/port/openssl/source/platform/ssl_pm.c b/components/ssl/mbedtls/port/openssl/source/platform/ssl_pm.c
index 74a0f4ff..c5b8cbc3 100644
--- a/components/ssl/mbedtls/port/openssl/source/platform/ssl_pm.c
+++ b/components/ssl/mbedtls/port/openssl/source/platform/ssl_pm.c
@@ -24,6 +24,7 @@
 #include "mbedtls/ctr_drbg.h"
 #include "mbedtls/error.h"
 #include "mbedtls/certs.h"
+#include "mbedtls/esp_debug.h"
 
 #define X509_INFO_STRING_LENGTH 3072
 #define OPENSSL_READ_BUFFER_LENGTH_MIN 2048
@@ -59,36 +60,9 @@ struct pkey_pm
     mbedtls_pk_context *ex_pkey;
 };
 
-unsigned int max_content_len;
-
 /*********************************************************************************************/
 /************************************ SSL arch interface *************************************/
 
-#ifdef CONFIG_OPENSSL_LOWLEVEL_DEBUG
-
-/* mbedtls debug level */
-#define MBEDTLS_DEBUG_LEVEL 4
-
-/**
- * @brief mbedtls debug function
- */
-static void ssl_platform_debug(void *ctx, int level,
-                     const char *file, int line,
-                     const char *str)
-{
-    /* Shorten 'file' from the whole file path to just the filename
-
-       This is a bit wasteful because the macros are compiled in with
-       the full _FILE_ path in each case.
-    */
-    char *file_sep = rindex(file, '/');
-    if(file_sep)
-        file = file_sep + 1;
-
-    SSL_DEBUG(SSL_DEBUG_ON, "%s:%d %s", file, line, str);
-}
-#endif
-
 /**
  * @brief create SSL low-level object
  */
@@ -105,18 +79,12 @@ int ssl_pm_new(SSL *ssl)
 
     const SSL_METHOD *method = ssl->method;
 
-    if (ssl->ctx->read_buffer_len < OPENSSL_READ_BUFFER_LENGTH_MIN ||
-        ssl->ctx->read_buffer_len > OPENSSL_READ_BUFFER_LENGTH_MAX)
-        return -1;
-
-     ssl_pm = ssl_mem_zalloc(sizeof(struct ssl_pm));
+    ssl_pm = ssl_mem_zalloc(sizeof(struct ssl_pm));
     if (!ssl_pm) {
         SSL_DEBUG(SSL_PLATFORM_ERROR_LEVEL, "no enough memory > (ssl_pm)");
         goto no_mem;
     }
 
-    max_content_len = ssl->ctx->read_buffer_len;
-
     mbedtls_net_init(&ssl_pm->fd);
     mbedtls_net_init(&ssl_pm->cl_fd);
 
@@ -161,11 +129,8 @@ int ssl_pm_new(SSL *ssl)
 
     mbedtls_ssl_conf_rng(&ssl_pm->conf, mbedtls_ctr_drbg_random, &ssl_pm->ctr_drbg);
 
-#ifdef CONFIG_OPENSSL_LOWLEVEL_DEBUG
-    mbedtls_debug_set_threshold(MBEDTLS_DEBUG_LEVEL);
-    mbedtls_ssl_conf_dbg(&ssl_pm->conf, ssl_platform_debug, NULL);
-#else
-    mbedtls_ssl_conf_dbg(&ssl_pm->conf, NULL, NULL);
+#ifdef CONFIG_MBEDTLS_DEBUG
+    mbedtls_esp_enable_debug_log(&ssl_pm->conf, CONFIG_MBEDTLS_DEBUG_LEVEL);
 #endif
 
     ret = mbedtls_ssl_setup(&ssl_pm->ssl, &ssl_pm->conf);
@@ -643,13 +608,6 @@ no_mem:
     return -1;
 }
 
-
-
-void ssl_pm_set_bufflen(SSL *ssl, int len)
-{
-    max_content_len = len;
-}
-
 long ssl_pm_get_verify_result(const SSL *ssl)
 {
     long ret;