273 lines
9.1 KiB
C
273 lines
9.1 KiB
C
/**
|
|
* \addtogroup rime
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \defgroup rimeannouncement Announcements
|
|
* @{
|
|
*
|
|
* The Announcement primitive does local area announcements. An
|
|
* announcement is an (ID, value) tuple that is disseminated to local
|
|
* area neighbors. An application or protocol can explicitly listen to
|
|
* announcements from neighbors. When an announcement is heard, a
|
|
* callback is invoked.
|
|
*
|
|
* Announcements can be used for a variety of network mechanisms such
|
|
* as neighbor discovery, node-level service discovery, or routing
|
|
* metric dissemination.
|
|
*
|
|
* Application programs and protocols register announcements with the
|
|
* announcement module. An announcement back-end, implemented by the
|
|
* system, takes care of sending out announcements over the radio, as
|
|
* well as collecting announcements heard from neighbors.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2008, Swedish Institute of Computer Science.
|
|
* 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
|
|
* Header file for the announcement primitive
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#ifndef __ANNOUNCEMENT_H__
|
|
#define __ANNOUNCEMENT_H__
|
|
|
|
#include "net/rime/rimeaddr.h"
|
|
|
|
struct announcement;
|
|
|
|
typedef void (*announcement_callback_t)(struct announcement *a,
|
|
const rimeaddr_t *from,
|
|
uint16_t id, uint16_t val);
|
|
|
|
/**
|
|
* \brief Representation of an announcement.
|
|
*
|
|
* This structure holds the state of an announcement. It
|
|
* is an opaque structure with no user-visible elements.
|
|
*/
|
|
struct announcement {
|
|
struct announcement *next;
|
|
uint16_t id;
|
|
uint16_t value;
|
|
announcement_callback_t callback;
|
|
uint8_t has_value;
|
|
};
|
|
|
|
/**
|
|
* \name Application API
|
|
* @{
|
|
*/
|
|
/**
|
|
* \brief Register an announcement
|
|
* \param a A pointer to a struct announcement
|
|
* \param id The identifying number of the announcement
|
|
* \param callback A pointer to a callback function that is called
|
|
* when an announcement is heard
|
|
*
|
|
* This function registers an announcement with the
|
|
* announcement module. The state of the announcement is
|
|
* held in a struct announcement variable, which is passed
|
|
* as an argument to this function. This variable must be
|
|
* allocated by the caller. An announcement is identified
|
|
* with a 16-bit number, which is passed as a parameter to
|
|
* the function. The announcement also has an initial
|
|
* value, that can later be changed with
|
|
* announcement_set_value().
|
|
*
|
|
*/
|
|
void announcement_register(struct announcement *a,
|
|
uint16_t id,
|
|
announcement_callback_t callback);
|
|
|
|
/**
|
|
* \brief Remove a previously registered announcement
|
|
* \param a A pointer to a struct announcement that has
|
|
* previously been registered
|
|
*
|
|
* This function removes an announcement that has
|
|
* previously been registered with
|
|
* announcement_register().
|
|
*
|
|
*/
|
|
void announcement_remove(struct announcement *a);
|
|
|
|
|
|
/**
|
|
* \brief Set the value of an announcement
|
|
* \param a A pointer to a struct announcement that has
|
|
* previously been registered
|
|
*
|
|
* This function sets the value of an announcement that
|
|
* has previously been registered with
|
|
* announcement_register().
|
|
*
|
|
*/
|
|
void announcement_set_value(struct announcement *a, uint16_t value);
|
|
|
|
/**
|
|
* \brief Remove the value of an announcement
|
|
* \param a A pointer to a struct announcement that has
|
|
* previously been registered
|
|
*
|
|
* This function removes the value of an announcement that
|
|
* has previously been registered with
|
|
* announcement_register().
|
|
*
|
|
*/
|
|
void announcement_remove_value(struct announcement *a);
|
|
|
|
|
|
/**
|
|
* \brief Bump an announcement
|
|
* \param a A pointer to a struct announcement that has
|
|
* previously been registered
|
|
*
|
|
* This function is called to inform the announcement
|
|
* module that a particular announcement has changed in a
|
|
* way that it should be bumped. When an announcement is
|
|
* bumped, the announcement back-end may send out a new
|
|
* announcement to neighbors.
|
|
*
|
|
*/
|
|
void announcement_bump(struct announcement *a);
|
|
|
|
/**
|
|
* \brief Listen for announcements for a specific amount of
|
|
* announcement periods
|
|
* \param periods The number of periods to listen for announcement
|
|
*
|
|
* This function starts to listen for announcements for
|
|
* the specified amount of announcement periods. This
|
|
* function is called to ensure that the announcement
|
|
* module hears announcements from neighbors. The
|
|
* announcement module may hear announcements even if
|
|
* listening is not explicitly enabled, but with listening
|
|
* enabled, more announcements will be heard.
|
|
*
|
|
*/
|
|
void announcement_listen(int periods);
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* \name System API
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Initialize the announcement module
|
|
*
|
|
* This function initializes the announcement module, and
|
|
* is called by the system at boot up.
|
|
*/
|
|
void announcement_init(void);
|
|
|
|
/**
|
|
* \brief Get the list of registered announcements
|
|
* \return The list of registered announcements
|
|
*
|
|
* This function returns the list of registered
|
|
* announcements. This function is used by the back-end to
|
|
* compile announcement packets from the registered
|
|
* announcements.
|
|
*
|
|
* The announcement list is an ordinary Contiki list, as
|
|
* defined by the \ref list "list module".
|
|
*
|
|
*/
|
|
struct announcement *announcement_list(void);
|
|
|
|
/**
|
|
* \brief Inform the announcement module of an incoming announcement
|
|
* \param from The address of the sender of the announcement
|
|
* \param id The identifier of the announcement
|
|
* \param value The value of the announcement
|
|
*
|
|
* This function is called by the back-end to inform the
|
|
* announcement module that an announcement from a
|
|
* neighbor has been heard.
|
|
*
|
|
*/
|
|
void announcement_heard(const rimeaddr_t *from, uint16_t id, uint16_t value);
|
|
|
|
/**
|
|
* \brief Register a listen callback with the announcement module
|
|
* \param callback A pointer to a callback function
|
|
*
|
|
* This function is called by the back-end to register a
|
|
* listen callback with the announcement module. The
|
|
* listen callback function is called by the announcement
|
|
* module as part of the announcement_listen() function.
|
|
*
|
|
*/
|
|
void announcement_register_listen_callback(void (*callback)(int time));
|
|
|
|
enum {
|
|
ANNOUNCEMENT_NOBUMP,
|
|
ANNOUNCEMENT_BUMP,
|
|
};
|
|
|
|
typedef void (* announcement_observer)(uint16_t id, uint8_t has_value,
|
|
uint16_t newvalue, uint16_t oldvalue,
|
|
uint8_t bump);
|
|
|
|
/**
|
|
* \brief Register an observer callback with the announcement module
|
|
* \param observer A pointer to an observer function
|
|
*
|
|
* This function is callback by the back-end to register
|
|
* an observer callback with the announcement module. The
|
|
* observer callback is called by the announcement module
|
|
* when an announcement is registered, removed, or have
|
|
* its identifier or value updated.
|
|
*
|
|
* The back-end may chose to send out a new announcement
|
|
* message with the updated values.
|
|
*
|
|
*/
|
|
void announcement_register_observer_callback(announcement_observer observer);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* __ANNOUNCE_H__ */
|
|
|
|
/** @} */
|
|
/** @} */
|