runicast.h

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/*
 * Copyright (c) 2006, Swedish Institute of Computer Science.
 * All rights reserved.
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/**
 * \file
 *         Reliable unicast header file
 * \author
 *         Adam Dunkels <adam@sics.se>
 */

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

/**
 * \defgroup rimerunicast Single-hop reliable unicast
 * @{
 *
 * The reliable single-hop unicast primitive (runicast) reliably sends
 * a packet to a single-hop neighbor.  The runicast primitive uses
 * acknowledgements and retransmissions to ensure that the neighbor
 * successfully receives the packet.  When the receiver has
 * acknowledged the packet, the ruc module notifies the sending
 * application via a callback.  The ruc primitive uses the stubborn
 * single-hop unicast primitive to do retransmissions.  Thus, the ruc
 * primitive does not have to manage the details of setting up timers
 * and doing retransmissions, but can concentrate on dealing with
 * acknowledgements.
 *
 * The runicast primitive adds two packet attributes: the single-hop
 * packet type and the single-hop packet ID.  The runicast primitive
 * uses the packet ID attribute as a sequence number for matching
 * acknowledgement packets to the corresponding data packets.
 *
 * The application or protocol that uses the runicast primitive can
 * specify the maximum number of transmissions that the ruc module
 * should attempt before the packet times out.  If a packet times out,
 * the application or protocol that sent the packet is notified with a
 * callback.
 *
 *
 * \section channels Channels
 *
 * The runicast module uses 1 channel.
 *
 */

#ifndef RUNICAST_H_
#define RUNICAST_H_

#include "net/rime/stunicast.h"

struct runicast_conn;


#define RUNICAST_PACKET_ID_BITS 2

#define RUNICAST_ATTRIBUTES  { PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_BIT }, \
                             { PACKETBUF_ATTR_PACKET_ID, PACKETBUF_ATTR_BIT * RUNICAST_PACKET_ID_BITS }, \
                             STUNICAST_ATTRIBUTES
struct runicast_callbacks {
  void (* recv)(struct runicast_conn *c, const linkaddr_t *from, uint8_t seqno);
  void (* sent)(struct runicast_conn *c, const linkaddr_t *to, uint8_t retransmissions);
  void (* timedout)(struct runicast_conn *c, const linkaddr_t *to, uint8_t retransmissions);
};

struct runicast_conn {
  struct stunicast_conn c;
  const struct runicast_callbacks *u;
  uint8_t sndnxt;
  uint8_t is_tx;
  uint8_t rxmit;
  uint8_t max_rxmit;
};

void runicast_open(struct runicast_conn *c, uint16_t channel,
               const struct runicast_callbacks *u);
void runicast_close(struct runicast_conn *c);

int runicast_send(struct runicast_conn *c, const linkaddr_t *receiver,
                  uint8_t max_retransmissions);

uint8_t runicast_is_transmitting(struct runicast_conn *c);

#endif /* RUNICAST_H_ */
/** @} */
/** @} */