osd-contiki/apps/er-coap/er-coap-observe-client.h

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/*
* Copyright (c) 2014, Daniele Alessandrelli.
* 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
* Extension to Erbium for enabling CoAP observe clients
* \author
* Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
*/
#ifndef COAP_OBSERVING_CLIENT_H_
#define COAP_OBSERVING_CLIENT_H_
#include "er-coap.h"
#include "er-coap-transactions.h"
#ifndef COAP_OBSERVE_CLIENT
#define COAP_OBSERVE_CLIENT 0
#endif
#ifdef COAP_CONF_MAX_OBSERVEES
#define COAP_MAX_OBSERVEES COAP_CONF_MAX_OBSERVEES
#else
#define COAP_MAX_OBSERVEES 4
#endif /* COAP_CONF_MAX_OBSERVEES */
#if COAP_MAX_OPEN_TRANSACTIONS < COAP_MAX_OBSERVEES
#warning "COAP_MAX_OPEN_TRANSACTIONS smaller than COAP_MAX_OBSERVEES: " \
"this may be a problem"
#endif
#define IS_RESPONSE_CODE_2_XX(message) (64 < message->code \
&& message->code < 128)
/*----------------------------------------------------------------------------*/
typedef enum {
OBSERVE_OK,
NOTIFICATION_OK,
OBSERVE_NOT_SUPPORTED,
ERROR_RESPONSE_CODE,
NO_REPLY_FROM_SERVER,
} coap_notification_flag_t;
/*----------------------------------------------------------------------------*/
typedef struct coap_observee_s coap_observee_t;
typedef void (*notification_callback_t)(coap_observee_t *subject,
void *notification,
coap_notification_flag_t);
struct coap_observee_s {
coap_observee_t *next; /* for LIST */
uip_ipaddr_t addr;
uint16_t port;
const char *url;
uint8_t token_len;
uint8_t token[COAP_TOKEN_LEN];
void *data; /* generic pointer for storing user data */
notification_callback_t notification_callback;
uint32_t last_observe;
};
/*----------------------------------------------------------------------------*/
coap_observee_t *coap_obs_add_observee(uip_ipaddr_t *addr, uint16_t port,
const uint8_t *token, size_t token_len,
const char *url,
notification_callback_t
notification_callback, void *data);
void coap_obs_remove_observee(coap_observee_t *o);
coap_observee_t *coap_obs_get_observee_by_token(const uint8_t *token,
size_t token_len);
int coap_obs_remove_observee_by_token(uip_ipaddr_t *addr, uint16_t port,
uint8_t *token, size_t token_len);
int coap_obs_remove_observee_by_url(uip_ipaddr_t *addr, uint16_t port,
const char *url);
void coap_handle_notification(uip_ipaddr_t *addr, uint16_t port,
coap_packet_t *notification);
coap_observee_t *coap_obs_request_registration(uip_ipaddr_t *addr,
uint16_t port, char *uri,
notification_callback_t
notification_callback,
void *data);
/* TODO: this function may be moved to er-coap.c */
uint8_t coap_generate_token(uint8_t **token_ptr);
#endif /* COAP_OBSERVING_CLIENT_H_ */