mirror of
https://github.com/0xFEEDC0DE64/arduino-esp32.git
synced 2025-10-30 21:51:40 +01:00
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
|
/*
|
||
|
|
* subscribe.h -- subscription handling for CoAP
|
||
|
|
* see draft-ietf-core-observe-16
|
||
|
|
*
|
||
|
|
* Copyright (C) 2010-2012,2014-2015 Olaf Bergmann <bergmann@tzi.org>
|
||
|
|
*
|
||
|
|
* This file is part of the CoAP library libcoap. Please see README for terms
|
||
|
|
* of use.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef _COAP_SUBSCRIBE_H_
|
||
|
|
#define _COAP_SUBSCRIBE_H_
|
||
|
|
|
||
|
|
#include "address.h"
|
||
|
|
#include "coap_io.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @defgroup observe Resource observation
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The value COAP_OBSERVE_ESTABLISH in a GET request indicates a new observe
|
||
|
|
* relationship for (sender address, token) is requested.
|
||
|
|
*/
|
||
|
|
#define COAP_OBSERVE_ESTABLISH 0
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The value COAP_OBSERVE_CANCEL in a GET request indicates that the observe
|
||
|
|
* relationship for (sender address, token) must be cancelled.
|
||
|
|
*/
|
||
|
|
#define COAP_OBSERVE_CANCEL 1
|
||
|
|
|
||
|
|
#ifndef COAP_OBS_MAX_NON
|
||
|
|
/**
|
||
|
|
* Number of notifications that may be sent non-confirmable before a confirmable
|
||
|
|
* message is sent to detect if observers are alive. The maximum allowed value
|
||
|
|
* here is @c 15.
|
||
|
|
*/
|
||
|
|
#define COAP_OBS_MAX_NON 5
|
||
|
|
#endif /* COAP_OBS_MAX_NON */
|
||
|
|
|
||
|
|
#ifndef COAP_OBS_MAX_FAIL
|
||
|
|
/**
|
||
|
|
* Number of confirmable notifications that may fail (i.e. time out without
|
||
|
|
* being ACKed) before an observer is removed. The maximum value for
|
||
|
|
* COAP_OBS_MAX_FAIL is @c 3.
|
||
|
|
*/
|
||
|
|
#define COAP_OBS_MAX_FAIL 3
|
||
|
|
#endif /* COAP_OBS_MAX_FAIL */
|
||
|
|
|
||
|
|
/** Subscriber information */
|
||
|
|
typedef struct coap_subscription_t {
|
||
|
|
struct coap_subscription_t *next; /**< next element in linked list */
|
||
|
|
coap_endpoint_t local_if; /**< local communication interface */
|
||
|
|
coap_address_t subscriber; /**< address and port of subscriber */
|
||
|
|
|
||
|
|
unsigned int non_cnt:4; /**< up to 15 non-confirmable notifies allowed */
|
||
|
|
unsigned int fail_cnt:2; /**< up to 3 confirmable notifies can fail */
|
||
|
|
unsigned int dirty:1; /**< set if the notification temporarily could not be
|
||
|
|
* sent (in that case, the resource's partially
|
||
|
|
* dirty flag is set too) */
|
||
|
|
size_t token_length; /**< actual length of token */
|
||
|
|
unsigned char token[8]; /**< token used for subscription */
|
||
|
|
} coap_subscription_t;
|
||
|
|
|
||
|
|
void coap_subscription_init(coap_subscription_t *);
|
||
|
|
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
#endif /* _COAP_SUBSCRIBE_H_ */
|