text: /*
   * Copyright (c) 2015-2017, Arm Limited and affiliates.
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef __COAP_MESSAGE_HANDLER_H__
  #define __COAP_MESSAGE_HANDLER_H__
  
  #include <inttypes.h>
  #include "mbed-coap/sn_coap_header.h"
  #include "ns_list.h"
  
  #define TRANSACTION_LIFETIME 180
  /* Default value for CoAP duplicate message buffer (0 = disabled) */
  #define DUPLICATE_MESSAGE_BUFFER_SIZE 0
  
  /**
   * \brief Service message response receive callback.
   *
   * Function that handles CoAP service message receiving and parsing
   *
   * \param msg_id           Id number of the current message.
   * \param response_ptr     Pointer to CoAP header structure.
   *
   * \return 0 for success / -1 for failure
    */
  typedef int coap_message_handler_response_recv(int8_t service_id, uint8_t source_address[static 16], uint16_t source_port, sn_coap_hdr_s *response_ptr);
  
  typedef struct coap_msg_handler_s {
      void *(*sn_coap_service_malloc)(uint16_t);
      void (*sn_coap_service_free)(void *);
  
      uint8_t (*sn_coap_tx_callback)(uint8_t *, uint16_t, sn_nsdl_addr_s *, void *);
  
      struct coap_s *coap;
  } coap_msg_handler_t;
  
  typedef struct coap_transaction {
      uint8_t remote_address[16];
      uint8_t local_address[16];
      uint8_t token[8];
      uint32_t create_time;
      uint8_t *data_ptr;
      coap_message_handler_response_recv *resp_cb;
      uint16_t remote_port;
      uint16_t msg_id;
      uint16_t data_len;
      int8_t service_id;
      uint8_t options;
      uint8_t token_len;
      sn_coap_msg_type_e req_msg_type;
      bool client_request: 1;
  
      ns_list_link_t link;
  } coap_transaction_t;
  
  
  extern coap_msg_handler_t *coap_message_handler_init(void *(*used_malloc_func_ptr)(uint16_t), void (*used_free_func_ptr)(void *),
                                    uint8_t (*used_tx_callback_ptr)(uint8_t *, uint16_t, sn_nsdl_addr_s *, void *));
  
  extern int8_t coap_message_handler_destroy(coap_msg_handler_t *handle);
  
  extern coap_transaction_t *coap_message_handler_transaction_valid(coap_transaction_t *tr_ptr);
  
  extern coap_transaction_t *coap_message_handler_find_transaction(uint8_t *address_ptr, uint16_t port);
  
  extern int16_t coap_message_handler_coap_msg_process(coap_msg_handler_t *handle, int8_t socket_id, const uint8_t source_addr_ptr[static 16], uint16_t port, const uint8_t dst_addr_ptr[static 16],
                                                           uint8_t *data_ptr, uint16_t data_len, int16_t (cb)(int8_t, sn_coap_hdr_s *, coap_transaction_t *));
  
  extern uint16_t coap_message_handler_request_send(coap_msg_handler_t *handle, int8_t service_id, uint8_t options, const uint8_t destination_addr[static 16],
                                                        uint16_t destination_port, sn_coap_msg_type_e msg_type, sn_coap_msg_code_e msg_code, const char *uri, sn_coap_content_format_e cont_type,
                                                        const uint8_t *payload_ptr, uint16_t payload_len, coap_message_handler_response_recv *request_response_cb);
  
  extern int8_t coap_message_handler_response_send(coap_msg_handler_t *handle, int8_t service_id, uint8_t options, sn_coap_hdr_s *request_ptr, sn_coap_msg_code_e message_code,
          sn_coap_content_format_e content_type, const uint8_t *payload_ptr, uint16_t payload_len);
  
  extern int8_t coap_message_handler_request_delete(coap_msg_handler_t *handle, int8_t service_id, uint16_t msg_id);
  
  extern int8_t coap_message_handler_exec(coap_msg_handler_t *handle, uint32_t current_time);
  
  extern void transaction_delete(coap_transaction_t *this);
  
  extern void transactions_delete_all(uint8_t *address_ptr, uint16_t port);
  
  extern int8_t coap_message_handler_response_send_by_msg_id(coap_msg_handler_t *handle, int8_t service_id, uint8_t options, uint16_t msg_id, sn_coap_msg_code_e message_code,
          sn_coap_content_format_e content_type, const uint8_t *payload_ptr,uint16_t payload_len);
  
  #endif
  