nes-proj/os/net/app-layer/coap/coap-transactions.h

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/*
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* CoAP module for reliable transport
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
/**
* \addtogroup coap
* @{
*/
#ifndef COAP_TRANSACTIONS_H_
#define COAP_TRANSACTIONS_H_
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#include "coap.h"
#include "coap-engine.h"
#include "coap-timer.h"
/*
* Modulo mask (thus +1) for a random number to get the tick number for the random
* retransmission time between COAP_RESPONSE_TIMEOUT and COAP_RESPONSE_TIMEOUT*COAP_RESPONSE_RANDOM_FACTOR.
*/
#define COAP_RESPONSE_TIMEOUT_TICKS (1000 * COAP_RESPONSE_TIMEOUT)
#define COAP_RESPONSE_TIMEOUT_BACKOFF_MASK (uint32_t)(((1000 * COAP_RESPONSE_TIMEOUT * ((float)COAP_RESPONSE_RANDOM_FACTOR - 1.0)) + 0.5) + 1)
/* container for transactions with message buffer and retransmission info */
typedef struct coap_transaction {
struct coap_transaction *next; /* for LIST */
uint16_t mid;
coap_timer_t retrans_timer;
uint32_t retrans_interval;
uint8_t retrans_counter;
coap_endpoint_t endpoint;
coap_resource_response_handler_t callback;
void *callback_data;
uint16_t message_len;
uint8_t message[COAP_MAX_PACKET_SIZE + 1]; /* +1 for the terminating '\0' which will not be sent
* Use snprintf(buf, len+1, "", ...) to completely fill payload */
} coap_transaction_t;
coap_transaction_t *coap_new_transaction(uint16_t mid, const coap_endpoint_t *ep);
void coap_send_transaction(coap_transaction_t *t);
void coap_clear_transaction(coap_transaction_t *t);
coap_transaction_t *coap_get_transaction_by_mid(uint16_t mid);
#endif /* COAP_TRANSACTIONS_H_ */
/** @} */