osd-contiki/core/net/rime/broadcast.h

140 lines
4.9 KiB
C

/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimeibc Best-effort local area broadcast
* @{
*
* The broadcast module sends packets to all local area neighbors with an a
* header that identifies the sender.
*
* The broadcast module sends a packet to all local neighbors. The
* module adds the single-hop sender address as a packet attribute to
* outgoing packets. All Rime primitives that need the identity of
* the sender in the outgoing packets use the broadcast primitive,
* either directly or indirectly through any of the other
* communication primitives that are based on the broadcast primitive.
*
* \section channels Channels
*
* The broadcast 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 identified best-effort local area broadcast
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __BROADCAST_H__
#define __BROADCAST_H__
#include "net/rime/abc.h"
#include "net/rime/rimeaddr.h"
struct broadcast_conn;
#define BROADCAST_ATTRIBUTES { PACKETBUF_ADDR_SENDER, PACKETBUF_ADDRSIZE }, \
ABC_ATTRIBUTES
/**
* \brief Callback structure for broadcast
*
*/
struct broadcast_callbacks {
/** Called when a packet has been received by the broadcast module. */
void (* recv)(struct broadcast_conn *ptr, const rimeaddr_t *sender);
void (* sent)(struct broadcast_conn *ptr, int status, int num_tx);
};
struct broadcast_conn {
struct abc_conn c;
const struct broadcast_callbacks *u;
};
/**
* \brief Set up an identified best-effort broadcast connection
* \param c A pointer to a struct broadcast_conn
* \param channel The channel on which the connection will operate
* \param u A struct broadcast_callbacks with function pointers to functions that will be called when a packet has been received
*
* This function sets up a broadcast connection on the
* specified channel. The caller must have allocated the
* memory for the struct broadcast_conn, usually by declaring it
* as a static variable.
*
* The struct broadcast_callbacks pointer must point to a structure
* containing a pointer to a function that will be called
* when a packet arrives on the channel.
*
*/
void broadcast_open(struct broadcast_conn *c, uint16_t channel,
const struct broadcast_callbacks *u);
/**
* \brief Close a broadcast connection
* \param c A pointer to a struct broadcast_conn
*
* This function closes a broadcast connection that has
* previously been opened with broadcast_open().
*
* This function typically is called as an exit handler.
*
*/
void broadcast_close(struct broadcast_conn *c);
/**
* \brief Send an identified best-effort broadcast packet
* \param c The broadcast connection on which the packet should be sent
* \retval Non-zero if the packet could be sent, zero otherwise
*
* This function sends an identified best-effort broadcast
* packet. The packet must be present in the packetbuf
* before this function is called.
*
* The parameter c must point to a broadcast connection that
* must have previously been set up with broadcast_open().
*
*/
int broadcast_send(struct broadcast_conn *c);
#endif /* __BROADCAST_H__ */
/** @} */
/** @} */