stunicast.h

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/*
 * Copyright (c) 2006, Swedish Institute of Computer Science.
 * All rights reserved.
 *
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *    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
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 * This file is part of the Contiki operating system.
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/**
 * \file
 *         Stubborn unicast header file
 * \author
 *         Adam Dunkels <adam@sics.se>
 */

/**
 * \addtogroup rime
 * @{
 */

/**
 * \defgroup rimestunicast Stubborn unicast
 * @{
 *
 * The stubborn single-hop unicast primitive (stunicast) repeatedly
 * sends a packet to a single-hop neighbor using the unicast
 * primitive.  The stunicast primitive sends and resends the packet
 * until an upper layer primitive or protocol cancels the
 * transmission.  While it is possible for applications and protocols
 * that use Rime to use the stubborn single-hop unicast primitive
 * directly, the stunicast primitive is primarily used by the reliable
 * single-hop unicast (runicast) primitive.
 *
 * Before the stunicast primitive sends a packet, it allocates a queue
 * buffer, to which the application data and packet attributes is
 * copied, and sets a timer.  When the timer expires, the stunicast
 * primitive copies the queue buffer to the Rime buffer and sends the
 * packet using the unicast primitive.  The stunicast primitive sets the
 * number of retransmissions for a packet as a packet attribute on 
 * outgoing packets.
 *
 * \section channels Channels
 *
 * The stunicast module uses 1 channel.
 *
 */

#ifndef STUNICAST_H_
#define STUNICAST_H_

#include "sys/ctimer.h"
#include "net/rime/unicast.h"
#include "net/queuebuf.h"

struct stunicast_conn;

#define STUNICAST_ATTRIBUTES  UNICAST_ATTRIBUTES

struct stunicast_callbacks {
  void (* recv)(struct stunicast_conn *c, const linkaddr_t *from);
  void (* sent)(struct stunicast_conn *c, int status, int num_tx);
};

struct stunicast_conn {
  struct unicast_conn c;
  struct ctimer t;
  struct queuebuf *buf;
  const struct stunicast_callbacks *u;
  linkaddr_t receiver;
};

void stunicast_open(struct stunicast_conn *c, uint16_t channel,
               const struct stunicast_callbacks *u);
void stunicast_close(struct stunicast_conn *c);

int stunicast_send_stubborn(struct stunicast_conn *c, const linkaddr_t *receiver,
                      clock_time_t rxmittime);
void stunicast_cancel(struct stunicast_conn *c);

int stunicast_send(struct stunicast_conn *c, const linkaddr_t *receiver);

void stunicast_set_timer(struct stunicast_conn *c, clock_time_t t);

linkaddr_t *stunicast_receiver(struct stunicast_conn *c);

#endif /* STUNICAST_H_ */
/** @} */
/** @} */