如何解决如何计算conitki中节点的到达率？
到达率 = 每个源的数据包生成率 = 数据包数/秒
在 contiki->examples->ipv6->rpl-collect = 文件是 udp-sender.c,udp-sink.c 来执行数据包聚合。
据我所知，contiki 中的“collect-common.c”文件将是执行此任务的人。
在这个文件中有一个注释“/*每60-62秒发送一个数据包。*/”并进行计算。
如果我想把到达率设置为10.20sec 是60-62吗？
我无法理解其中的逻辑。 请帮助我。
/*
* Copyright (c) 2010,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,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.
*
*/
/**
* \file
* Example of how the collect primitive works.
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "lib/random.h"
#include "net/netstack.h"
#include "dev/serial-line.h"
#include "dev/leds.h"
#include "collect-common.h"
#include "net/packetbuf.h"
#include "net/ip/uip-udp-packet.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
static unsigned long time_offset;
static int send_active = 1;
#ifndef PERIOD
#define PERIOD 60
#endif
#define RANDWAIT (PERIOD)
/*---------------------------------------------------------------------------*/
PROCESS(collect_common_process,"collect common process");
AUTOSTART_PROCESSES(&collect_common_process);
/*---------------------------------------------------------------------------*/
static unsigned long
get_time(void)
{
return clock_seconds() + time_offset;
}
/*---------------------------------------------------------------------------*/
static unsigned long
strtolong(const char *data) {
unsigned long value = 0;
int i;
for(i = 0; i < 10 && isdigit(data[i]); i++) {
value = value * 10 + data[i] - '0';
}
return value;
}
/*---------------------------------------------------------------------------*/
void
collect_common_set_send_active(int active)
{
send_active = active;
}
/*---------------------------------------------------------------------------*/
void
collect_common_recv(const linkaddr_t *originator,uint8_t seqno,uint8_t hops,uint8_t *payload,uint16_t payload_len)
{
unsigned long time;
uint16_t data;
int i;
printf("%u",8 + payload_len / 2);
/* Timestamp. Ignore time synch for now. */
time = get_time();
printf(" %lu %lu 0",((time >> 16) & 0xffff),time & 0xffff);
/* Ignore latency for now */
printf(" %u %u %u %u",originator->u8[0] + (originator->u8[1] << 8),seqno,hops,0);
for(i = 0; i < payload_len / 2; i++) {
memcpy(&data,payload,sizeof(data));
payload += sizeof(data);
// printf(" %u",data);
}
printf("\n");
printf("Sink Recieved ");
printf("%d",packetbuf_datalen());
printf(" bytes. \n");
leds_blink();
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(collect_common_process,ev,data)
{
static struct etimer period_timer,wait_timer;
PROCESS_BEGIN();
collect_common_net_init();
/* Send a packet every 60-62 seconds. */
etimer_set(&period_timer,CLOCK_SECOND * PERIOD);
while(1) {
PROCESS_WAIT_EVENT();
if(ev == serial_line_event_message) {
char *line;
line = (char *)data;
if(strncmp(line,"collect",7) == 0 ||
strncmp(line,"gw",2) == 0) {
collect_common_set_sink();
} else if(strncmp(line,"net",3) == 0) {
collect_common_net_print();
} else if(strncmp(line,"time ",5) == 0) {
unsigned long tmp;
line += 6;
while(*line == ' ') {
line++;
}
tmp = strtolong(line);
time_offset = clock_seconds() - tmp;
printf("Time offset set to %lu\n",time_offset);
} else if(strncmp(line,"mac ",4) == 0) {
line +=4;
while(*line == ' ') {
line++;
}
if(*line == '0') {
NETSTACK_RDC.off(1);
printf("mac: turned MAC off (keeping radio on): %s\n",NETSTACK_RDC.name);
} else {
NETSTACK_RDC.on();
printf("mac: turned MAC on: %s\n",NETSTACK_RDC.name);
}
} else if(strncmp(line,"~K",2) == 0 ||
strncmp(line,"killall",7) == 0) {
/* Ignore stop commands */
} else {
printf("unhandled command: %s\n",line);
}
}
if(ev == PROCESS_EVENT_TIMER) {
if(data == &period_timer) {
etimer_reset(&period_timer);
etimer_set(&wait_timer,random_rand() % (CLOCK_SECOND * RANDWAIT));
} else if(data == &wait_timer) {
if(send_active) {
/* Time to send the data */
collect_common_send();
}
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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