nes-proj/core/net/rime/stbroadcast.h

154 lines
5.2 KiB
C

/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimestbroadcast Stubborn best-effort local area broadcast
* @{
*
* The stbroadcast module provides stubborn anonymous best-effort local area
* broadcast. A message sent with the stbroadcast module is repeated until
* either the message is canceled or a new message is sent. Messages
* sent with the stbroadcast module are not identified with a sender ID.
*
* \section channels Channels
*
* The stbroadcast module uses 1 channel.
*
*/
/*
* Copyright (c) 2006, 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 Rime module Stubborn Anonymous BroadCast (stbroadcast)
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __STBROADCAST_H__
#define __STBROADCAST_H__
#include "sys/ctimer.h"
#include "net/rime/broadcast.h"
#include "net/queuebuf.h"
struct stbroadcast_conn;
struct stbroadcast_callbacks {
void (* recv)(struct stbroadcast_conn *c);
void (* sent)(struct stbroadcast_conn *c);
};
/**
* A stbroadcast connection. This is an opaque structure with no user-visible
* fields. The stbroadcast_open() function is used for setting up a stbroadcast
* connection.
*/
struct stbroadcast_conn {
struct broadcast_conn c;
struct ctimer t;
struct queuebuf *buf;
const struct stbroadcast_callbacks *u;
};
/**
* \brief Set up a stbroadcast connection.
* \param c A pointer to a user-supplied struct stbroadcast variable.
* \param channel The Rime channel on which messages should be sent.
* \param u Pointer to the upper layer functions that should be used
* for this connection.
*
* This function sets up a stbroadcast connection on the
* specified channel. No checks are made if the channel is
* currently used by another connection.
*
* This function must be called before any other function
* that operates on the connection is called.
*
*/
void stbroadcast_open(struct stbroadcast_conn *c, uint16_t channel,
const struct stbroadcast_callbacks *u);
void stbroadcast_close(struct stbroadcast_conn *c);
/**
* \brief Send a stubborn message.
* \param c A stbroadcast connection that must have been previously set up
* with stbroadcast_open()
* \param t The time between message retransmissions.
*
* This function sends a message from the Rime buffer. The
* message must have been previously constructed in the
* Rime buffer. When this function returns, the message
* has been copied into a queue buffer.
*
* If another message has previously been sent, the old
* message is canceled.
*
*/
int stbroadcast_send_stubborn(struct stbroadcast_conn *c, clock_time_t t);
/**
* \brief Cancel the current stubborn message.
* \param c A stbroadcast connection that must have been previously set up
* with stbroadcast_open()
*
* This function cancels a stubborn message that has
* previously been sent with the stbroadcast_send_stubborn()
* function.
*
*/
void stbroadcast_cancel(struct stbroadcast_conn *c);
/**
* \brief Set the retransmission time of the current stubborn message.
* \param c A stbroadcast connection that must have been previously set up
* with stbroadcast_open()
* \param t The new time between message retransmissions.
*
* This function sets the retransmission timer for the
* current stubborn message to a new value.
*
*/
void stbroadcast_set_timer(struct stbroadcast_conn *c, clock_time_t t);
#endif /* __STBROADCAST_H__ */
/** @} */
/** @} */