contiki/apps/er-coap-13/er-coap-13-observing.h

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2013-02-13 16:43:04 +00:00
/*
* Copyright (c) 2012, 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 observing resources
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#ifndef COAP_OBSERVING_H_
#define COAP_OBSERVING_H_
#include "er-coap-13.h"
#include "er-coap-13-transactions.h"
#ifndef COAP_MAX_OBSERVERS
#define COAP_MAX_OBSERVERS COAP_MAX_OPEN_TRANSACTIONS-1
#endif /* COAP_MAX_OBSERVERS */
/* Interval in seconds in which NON notifies are changed to CON notifies to check client. */
#define COAP_OBSERVING_REFRESH_INTERVAL 60
#if COAP_MAX_OPEN_TRANSACTIONS<COAP_MAX_OBSERVERS
#warning "COAP_MAX_OPEN_TRANSACTIONS smaller than COAP_MAX_OBSERVERS: cannot handle CON notifications"
#endif
typedef struct coap_observer {
struct coap_observer *next; /* for LIST */
const char *url;
uip_ipaddr_t addr;
uint16_t port;
uint8_t token_len;
uint8_t token[COAP_TOKEN_LEN];
uint16_t last_mid;
struct stimer refresh_timer;
} coap_observer_t;
list_t coap_get_observers(void);
coap_observer_t *coap_add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token, size_t token_len, const char *url);
void coap_remove_observer(coap_observer_t *o);
int coap_remove_observer_by_client(uip_ipaddr_t *addr, uint16_t port);
int coap_remove_observer_by_token(uip_ipaddr_t *addr, uint16_t port, uint8_t *token, size_t token_len);
int coap_remove_observer_by_url(uip_ipaddr_t *addr, uint16_t port, const char *url);
int coap_remove_observer_by_mid(uip_ipaddr_t *addr, uint16_t port, uint16_t mid);
void coap_notify_observers(resource_t *resource, int32_t obs_counter, void *notification);
void coap_observe_handler(resource_t *resource, void *request, void *response);
#endif /* COAP_OBSERVING_H_ */