84 lines
3.3 KiB
C
84 lines
3.3 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* CoAP module for observing resources
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#ifndef COAP_OBSERVING_H_
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#define COAP_OBSERVING_H_
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#include "sys/stimer.h"
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#include "er-coap-13.h"
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#include "er-coap-13-transactions.h"
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#ifndef COAP_MAX_OBSERVERS
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#define COAP_MAX_OBSERVERS COAP_MAX_OPEN_TRANSACTIONS-1
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#endif /* COAP_MAX_OBSERVERS */
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/* Interval in seconds in which NON notifies are changed to CON notifies to check client. */
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#define COAP_OBSERVING_REFRESH_INTERVAL 60
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#if COAP_MAX_OPEN_TRANSACTIONS<COAP_MAX_OBSERVERS
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#warning "COAP_MAX_OPEN_TRANSACTIONS smaller than COAP_MAX_OBSERVERS: cannot handle CON notifications"
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#endif
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typedef struct coap_observer {
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struct coap_observer *next; /* for LIST */
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const char *url;
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uip_ipaddr_t addr;
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uint16_t port;
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uint8_t token_len;
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uint8_t token[COAP_TOKEN_LEN];
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uint16_t last_mid;
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struct stimer refresh_timer;
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} coap_observer_t;
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list_t coap_get_observers(void);
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coap_observer_t *coap_add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token, size_t token_len, const char *url);
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void coap_remove_observer(coap_observer_t *o);
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int coap_remove_observer_by_client(uip_ipaddr_t *addr, uint16_t port);
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int coap_remove_observer_by_token(uip_ipaddr_t *addr, uint16_t port, uint8_t *token, size_t token_len);
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int coap_remove_observer_by_url(uip_ipaddr_t *addr, uint16_t port, const char *url);
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int coap_remove_observer_by_mid(uip_ipaddr_t *addr, uint16_t port, uint16_t mid);
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void coap_notify_observers(resource_t *resource, int32_t obs_counter, void *notification);
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void coap_observe_handler(resource_t *resource, void *request, void *response);
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#endif /* COAP_OBSERVING_H_ */
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