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

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/*
* Copyright (c) 2016-2018, SICS, Swedish ICT AB.
* 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.
*/
/**
* \file
* API for CoAP transport
* \author
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
/**
* \addtogroup coap
* @{
*
* \defgroup coap-transport CoAP transport API
* @{
*
* The CoAP transport API defines a common interface for sending/receiving
* CoAP messages.
*/
#ifndef COAP_TRANSPORT_H_
#define COAP_TRANSPORT_H_
#include "coap-endpoint.h"
/**
* \brief Returns a common data buffer that can be used when
* generating CoAP messages for transmission. The buffer
* size is at least COAP_MAX_PACKET_SIZE bytes.
*
* In Contiki-NG, this corresponds to the uIP buffer.
*
* \return A pointer to a data buffer where a CoAP message can be stored.
*/
uint8_t *coap_databuf(void);
/**
* \brief Send a message to the specified CoAP endpoint
* \param ep A pointer to a CoAP endpoint
* \param data A pointer to data to send
* \param len The size of the data to send
* \return The number of bytes sent or negative if an error occurred.
*/
int coap_sendto(const coap_endpoint_t *ep, const uint8_t *data, uint16_t len);
/**
* \brief Initialize the CoAP transport.
*
* This function initializes the CoAP transport implementation and
* should only be called by the CoAP engine.
*/
void coap_transport_init(void);
#endif /* COAP_TRANSPORT_H_ */
/** @} */
/** @} */