here is source  code ,who know why?
 
   wolfSSL_Init();     
      client->data.ctx = SSL_CTX_new(wolfSSLv3_client_method());     
     
   
      if (wolfSSL_CTX_set_cipher_list(client->data.ctx, cipherList) != SSL_SUCCESS)
      {
        uart_printf( "set cipher error" );
      }
     
      base64decode( host_root_ca_buffer , &lengh  , lock_rev_buffer);
      ret = wolfSSL_CTX_use_certificate_buffer(client->data.ctx,lock_rev_buffer, lengh, SSL_FILETYPE_PEM);
     
      base64decode( host_root_key_buffer , &lengh  , lock_rev_buffer);
      ret = wolfSSL_CTX_use_PrivateKey_buffer(client->data.ctx,lock_rev_buffer, lengh , SSL_FILETYPE_PEM );     

      client->data.ssl = SSL_new(client->data.ctx);
     
      client->data.bio = wolfSSL_BIO_new_socket((int)client->connection,0);

      wolfSSL_set_bio(client->data.ssl, client->data.bio, client->data.bio);
      wolfSSL_CTX_set_verify(client->data.ctx, SSL_VERIFY_NONE, 0);
      SSL_set_connect_state(client->data.ssl);
     ///// wolfSSL_set_group_messages(client->data.ssl);

     // client_ssl_handshake(client->data.ssl);
     
      if (wolfSSL_negotiate(client->data.ssl) != SSL_SUCCESS)
      {
        BIO_free(client->data.bio);
        SSL_CTX_free(client->data.ctx);
        SSL_free(client->data.ssl);   
        return LOCKDOWN_STATUS_START_SESSION_FAILED;
       
      }