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