799e9350a0
Client-side support for CoAP observe is not compiled by default. To enable it, the COAP_OBSERVE_CLIENT macro must be defined equal to 1.
121 lines
4.7 KiB
C
121 lines
4.7 KiB
C
/*
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* Copyright (c) 2014, Daniele Alessandrelli.
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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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/*
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* \file
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* Extension to Erbium for enabling CoAP observe clients
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* \author
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* Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
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*/
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#ifndef COAP_OBSERVING_CLIENT_H_
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#define COAP_OBSERVING_CLIENT_H_
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#include "er-coap.h"
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#include "er-coap-transactions.h"
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#ifndef COAP_OBSERVE_CLIENT
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#define COAP_OBSERVE_CLIENT 0
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#endif
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#ifdef COAP_CONF_MAX_OBSERVEES
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#define COAP_MAX_OBSERVEES COAP_CONF_MAX_OBSERVEES
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#else
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#define COAP_MAX_OBSERVEES 4
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#endif /* COAP_CONF_MAX_OBSERVEES */
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#if COAP_MAX_OPEN_TRANSACTIONS < COAP_MAX_OBSERVEES
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#warning "COAP_MAX_OPEN_TRANSACTIONS smaller than COAP_MAX_OBSERVEES: " \
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"this may be a problem"
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#endif
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#define IS_RESPONSE_CODE_2_XX(message) (64 < message->code \
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&& message->code < 128)
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/*----------------------------------------------------------------------------*/
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typedef enum {
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OBSERVE_OK,
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NOTIFICATION_OK,
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OBSERVE_NOT_SUPPORTED,
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ERROR_RESPONSE_CODE,
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NO_REPLY_FROM_SERVER,
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} coap_notification_flag_t;
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/*----------------------------------------------------------------------------*/
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typedef struct coap_observee_s coap_observee_t;
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typedef void (*notification_callback_t)(coap_observee_t *subject,
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void *notification,
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coap_notification_flag_t);
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struct coap_observee_s {
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coap_observee_t *next; /* for LIST */
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uip_ipaddr_t addr;
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uint16_t port;
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const char *url;
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uint8_t token_len;
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uint8_t token[COAP_TOKEN_LEN];
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void *data; /* generic pointer for storing user data */
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notification_callback_t notification_callback;
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uint32_t last_observe;
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};
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/*----------------------------------------------------------------------------*/
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coap_observee_t *coap_obs_add_observee(uip_ipaddr_t *addr, uint16_t port,
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const uint8_t *token, size_t token_len,
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const char *url,
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notification_callback_t
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notification_callback, void *data);
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void coap_obs_remove_observee(coap_observee_t *o);
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coap_observee_t *coap_obs_get_observee_by_token(const uint8_t *token,
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size_t token_len);
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int coap_obs_remove_observee_by_token(uip_ipaddr_t *addr, uint16_t port,
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uint8_t *token, size_t token_len);
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int coap_obs_remove_observee_by_url(uip_ipaddr_t *addr, uint16_t port,
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const char *url);
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void coap_handle_notification(uip_ipaddr_t *, uint16_t port,
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coap_packet_t *notification);
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coap_observee_t *coap_obs_request_registration(uip_ipaddr_t *addr,
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uint16_t port, char *uri,
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notification_callback_t
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notification_callback,
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void *data);
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/* TODO: this function may be moved to er-coap.c */
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uint8_t coap_generate_token(uint8_t **token_ptr);
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#endif /* COAP_OBSERVING_CLIENT_H_ */
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