text: /*----------------------------------------------------------------------------
   * Copyright (c) <2018>, <Huawei Technologies Co., Ltd>
   * All rights reserved.
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * 1. Redistributions of source code must retain the above copyright notice, this list of
   * conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice, this list
   * of conditions and the following disclaimer in the documentation and/or other materials
   * provided with the distribution.
   * 3. Neither the name of the copyright holder nor the names of its contributors may be used
   * to endorse or promote products derived from this software without specific prior written
   * permission.
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *---------------------------------------------------------------------------*/
  /*----------------------------------------------------------------------------
   * Notice of Export Control Law
   * ===============================================
   * Huawei LiteOS may be subject to applicable export control laws and regulations, which might
   * include those applicable to Huawei LiteOS of U.S. and the country in which you are located.
   * Import, export and usage of Huawei LiteOS in any manner by you shall be in compliance with such
   * applicable export control laws and regulations.
   *---------------------------------------------------------------------------*/
  
  
  
  #include <stddef.h>
  #include <stdint.h>
  #include <string.h>
  #include <stdio.h>
  #include <dtls_al.h>
  #include <link_log.h>
  
  
  static const dtls_al_t  *s_dtls_al;
  
  en_dtls_al_err_t dtls_al_new(dtls_al_para_t *para,void **handle)
  {
      en_dtls_al_err_t ret = EN_DTLS_AL_ERR_NOCONFIG;
      if( (NULL != s_dtls_al) && (NULL != s_dtls_al->io.io_new) )
      {
          ret = s_dtls_al->io.io_new(para, handle);
      }
      return ret;
  }
  
  
  int   dtls_al_connect(void *handle,const char *server_ip, const char *server_port, int timeout)
  {
      int ret = -1;
      if( (NULL != s_dtls_al) && (NULL != s_dtls_al->io.io_connect))
      {
          ret = s_dtls_al->io.io_connect(handle, server_ip,server_port, timeout);
      }
      return ret;
  }
  
  int   dtls_al_write(void *handle, uint8_t *msg, size_t len, int timeout)
  {
      int ret = 0;
      if( (NULL != s_dtls_al) && (NULL != s_dtls_al->io.io_write))
      {
          ret = s_dtls_al->io.io_write(handle, msg, len, timeout );
      }
      return ret;
  }
  
  int  dtls_al_read(void *handle, uint8_t *buf, size_t len, int timeout)
  {
      int ret = 0;
      if( (NULL != s_dtls_al) && (NULL != s_dtls_al->io.io_read))
      {
          ret = s_dtls_al->io.io_read(handle, buf, len, timeout );
      }
      return ret;
  }
  
  en_dtls_al_err_t   dtls_al_destroy(void *handle)
  {
      en_dtls_al_err_t ret = EN_DTLS_AL_ERR_NOCONFIG;
      if( (NULL != s_dtls_al) && (NULL != s_dtls_al->io.io_destroy))
      {
          ret = s_dtls_al->io.io_destroy( handle );
      }
      return ret;
  }
  
  
  int dtls_al_install(const dtls_al_t *dtls)
  {
      int ret = -1;
      if (NULL == s_dtls_al )
      {
          s_dtls_al = dtls;
          ret = 0;
      }
  
      return ret;
  }
  
  int dtls_al_uninstall(const char*name)
  {
      int ret = -1;
  
      if((NULL != s_dtls_al) && (0 == strcmp(name,s_dtls_al->name)))
      {
          s_dtls_al = NULL;
      }
  
      return ret;
  }
  
  #if 0 //
  __attribute__((weak))  int dtls_imp_init(void)
  {
      LINK_LOG_DEBUG("%s:###please implement dtls by yourself####\n\r",__FUNCTION__);
      return -1;
  }
  #endif
  
  int dtls_al_init(void)
  {
  
      int ret;
  
      ret = dtls_imp_init();
  
      LINK_LOG_DEBUG("IOT_LINK:DO DTLS LOAD-IMPLEMENT RET:%d\n\r",ret);
  
  
      return ret;
  }
  
  
  