/**
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* \addtogroup rimerunicast
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* @{
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*/
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/*
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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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* Reliable unicast
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/rime/runicast.h"
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#include "net/rime.h"
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#include <string.h>
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#ifdef RUNICAST_CONF_REXMIT_TIME
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#define REXMIT_TIME RUNICAST_CONF_REXMIT_TIME
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#else /* RUNICAST_CONF_REXMIT_TIME */
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#define REXMIT_TIME CLOCK_SECOND
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#endif /* RUNICAST_CONF_REXMIT_TIME */
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static const struct packetbuf_attrlist attributes[] =
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{
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RUNICAST_ATTRIBUTES
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PACKETBUF_ATTR_LAST
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};
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static void
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sent_by_stunicast(struct stunicast_conn *stunicast, int status, int num_tx)
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{
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struct runicast_conn *c = (struct runicast_conn *)stunicast;
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PRINTF("runicast: sent_by_stunicast c->rxmit %d num_tx %d\n",
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c->rxmit, num_tx);
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/* Only process data packets, not ACKs. */
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) == PACKETBUF_ATTR_PACKET_TYPE_DATA) {
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c->rxmit += 1;
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if(c->rxmit != 0) {
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RIMESTATS_ADD(rexmit);
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PRINTF("%d.%d: runicast: sent_by_stunicast packet %u (%u) resent %u\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID),
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c->sndnxt, c->rxmit);
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}
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if(c->rxmit >= c->max_rxmit) {
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RIMESTATS_ADD(timedout);
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c->is_tx = 0;
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stunicast_cancel(&c->c);
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if(c->u->timedout) {
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c->u->timedout(c, stunicast_receiver(&c->c), c->rxmit);
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}
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c->rxmit = 0;
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PRINTF("%d.%d: runicast: packet %d timed out\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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c->sndnxt);
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c->sndnxt = (c->sndnxt + 1) % (1 << RUNICAST_PACKET_ID_BITS);
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} else {
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// int shift;
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// shift = c->rxmit > 4? 4: c->rxmit;
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// stunicast_set_timer(&c->c, (REXMIT_TIME) << shift);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv_from_stunicast(struct stunicast_conn *stunicast, const rimeaddr_t *from)
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{
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struct runicast_conn *c = (struct runicast_conn *)stunicast;
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/* struct runicast_hdr *hdr = packetbuf_dataptr();*/
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PRINTF("%d.%d: runicast: recv_from_stunicast from %d.%d type %d seqno %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE),
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
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PACKETBUF_ATTR_PACKET_TYPE_ACK) {
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PRINTF("%d.%d: runicast: got ACK from %d.%d, seqno %d (%d)\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID),
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c->sndnxt);
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == c->sndnxt) {
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RIMESTATS_ADD(ackrx);
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PRINTF("%d.%d: runicast: ACKed %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
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c->sndnxt = (c->sndnxt + 1) % (1 << RUNICAST_PACKET_ID_BITS);
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c->is_tx = 0;
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stunicast_cancel(&c->c);
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if(c->u->sent != NULL) {
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c->u->sent(c, stunicast_receiver(&c->c), c->rxmit);
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}
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} else {
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PRINTF("%d.%d: runicast: received bad ACK %d for %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID),
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c->sndnxt);
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RIMESTATS_ADD(badackrx);
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}
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} else if(packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE) ==
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PACKETBUF_ATTR_PACKET_TYPE_DATA) {
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/* int send_ack = 1;*/
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uint16_t packet_seqno;
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struct queuebuf *q;
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RIMESTATS_ADD(reliablerx);
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PRINTF("%d.%d: runicast: got packet %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
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packet_seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
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/* packetbuf_hdrreduce(sizeof(struct runicast_hdr));*/
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q = queuebuf_new_from_packetbuf();
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if(q != NULL) {
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PRINTF("%d.%d: runicast: Sending ACK to %d.%d for %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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packet_seqno);
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packetbuf_clear();
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/* packetbuf_hdralloc(sizeof(struct runicast_hdr));
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hdr = packetbuf_hdrptr();
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hdr->type = TYPE_ACK;
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hdr->seqno = packet_seqno;*/
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_PACKET_TYPE_ACK);
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, packet_seqno);
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stunicast_send(&c->c, from);
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RIMESTATS_ADD(acktx);
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queuebuf_to_packetbuf(q);
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queuebuf_free(q);
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} else {
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PRINTF("%d.%d: runicast: could not send ACK to %d.%d for %d: no queued buffers\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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from->u8[0], from->u8[1],
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packet_seqno);
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}
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if(c->u->recv != NULL) {
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c->u->recv(c, from, packet_seqno);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct stunicast_callbacks runicast = {recv_from_stunicast,
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sent_by_stunicast};
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/*---------------------------------------------------------------------------*/
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void
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runicast_open(struct runicast_conn *c, uint16_t channel,
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const struct runicast_callbacks *u)
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{
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stunicast_open(&c->c, channel, &runicast);
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channel_set_attributes(channel, attributes);
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c->u = u;
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c->is_tx = 0;
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c->rxmit = 0;
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c->sndnxt = 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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runicast_close(struct runicast_conn *c)
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{
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stunicast_close(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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runicast_is_transmitting(struct runicast_conn *c)
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{
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return c->is_tx;
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}
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/*---------------------------------------------------------------------------*/
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int
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runicast_send(struct runicast_conn *c, const rimeaddr_t *receiver,
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uint8_t max_retransmissions)
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{
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int ret;
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if(runicast_is_transmitting(c)) {
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PRINTF("%d.%d: runicast: already transmitting\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1]);
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return 0;
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}
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packetbuf_set_attr(PACKETBUF_ATTR_RELIABLE, 1);
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_PACKET_TYPE_DATA);
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, c->sndnxt);
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packetbuf_set_attr(PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS, 3);
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c->max_rxmit = max_retransmissions;
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c->rxmit = 0;
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c->is_tx = 1;
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RIMESTATS_ADD(reliabletx);
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PRINTF("%d.%d: runicast: sending packet %d\n",
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rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
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c->sndnxt);
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ret = stunicast_send_stubborn(&c->c, receiver, REXMIT_TIME);
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if(!ret) {
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c->is_tx = 0;
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}
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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