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