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c_lqe_ewma.c
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c_lqe_ewma.c
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/*
* c_lqe_ewma.c
*
* Created on: Jan 21, 2014
* Author: carolina
*/
#include "lib/list.h"
#include "lib/memb.h"
#include "net/packetbuf.h"
#include "net/rime/rimeaddr.h"
#include "amodule.h"
#include "c_lqe_ewma.h"
#define DEBUG 1
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#ifdef NEIGHBOR_LIFETIME
#define DEFAULT_LIFETIME NEIGHBOR_LIFETIME
#else /* NEIGHBOR_LIFETIME */
#define NEIGHBOR_LIFETIME 180//00
#endif /* NEIGHBOR_LIFETIME */
static uint16_t seqno;
static struct ctimer t;
static void
print_list(list_t neighbor_list){
struct c_neighbor *n;
PRINTF("list length %d \n", list_length(neighbor_list));
for(n = list_head(neighbor_list); n != NULL; n = list_item_next(n)) {
PRINTF("address %d.%d count %d cost %f lseqn %d\n", n->addr.u8[1],
n->addr.u8[0], n->count, n->cost, n->last_seq_no);
}
}
/*---------------------------------------------------------------------------*/
static void
periodic(struct pipe* p)
{
uint16_t crtseqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
uint16_t l = 0;
struct c_neighbor *n;
struct c_neighbor *new_n = memb_alloc(&p->neighbor_mem);;
double alpha = p->lqe_ewma_param.alpha;
for(n = list_head(p->neighbor_list); n != NULL; n = list_item_next(n)) {
if(rimeaddr_cmp(&new_n->addr, &n->addr)) {
memcpy(new_n, n, sizeof (struct c_neighbor));
if (n->rate > 0.9) {
l = (uint16_t)((clock_time() - n->last_time_stamp) / (clock_time()));
} else {
l = (uint16_t)((clock_time() - n->last_time_stamp) * n->rate);
}
uint8_t lost_p = 0;
for(lost_p = 0; lost_p < l; lost_p++) { n->cost *= alpha; }
new_n->cost = n->cost;
new_n->k = l;
list_remove(p->neighbor_list, n);
memb_free(&p->neighbor_mem, n);
list_push(p->neighbor_list, new_n);
print_list(p->neighbor_list);
}
}
ctimer_set(&t, CLOCK_SECOND * NEIGHBOR_LIFETIME, periodic, p);
}
/*---------------------------------------------------------------------------*/
void
c_lqe_ewma_open(struct pipe *p, struct stackmodule_i *module){
PRINTF("c_lqe_ewma_open\n");
seqno = 1;
clock_init();
ctimer_set(&t, CLOCK_SECOND * NEIGHBOR_LIFETIME, periodic, p);
}
/*---------------------------------------------------------------------------*/
void
c_lqe_ewma_close(struct pipe *p, struct stackmodule_i *module) {
PRINTF("c_lqe_ewma_close\n");
}
/*---------------------------------------------------------------------------*/
int
c_lqe_ewma_send(struct pipe *p, struct stackmodule_i *module) {
PRINTF("c_lqe_ewma_send \n");
packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, seqno++);
return 1;
}
/*---------------------------------------------------------------------------*/
void
c_lqe_ewma_recv(struct pipe *p, struct stackmodule_i *module){
PRINTF("c_lqe_ewma_recv seqno %u \n", packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
uint16_t crtseqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
int16_t l = 0;
struct c_neighbor *n;
struct c_neighbor *new_n = memb_alloc(&p->neighbor_mem);;
rimeaddr_copy(&new_n->addr, get_node_addr(0, 1, 0));
double alpha = p->lqe_ewma_param.alpha;
uint8_t list_len = list_length(p->neighbor_list);
double highest_cost = 100.0;
/* Find the neighbor. */
for(n = list_head(p->neighbor_list); n != NULL; n = list_item_next(n)) {
if(rimeaddr_cmp(&new_n->addr, &n->addr)) {
if (highest_cost > n->cost) { highest_cost = n->cost; }
PRINTF("node found \n");
PRINTF("n-lastseqno %d n-m %d n-k %d\n", n->last_seq_no, n->m, n->k);
new_n->m = crtseqno - n->last_seq_no - 1; //the current seq number - last seq number - crt packet no
if (new_n->m > n->k) {
l = new_n->m - n->k;
new_n->k = n->k;
} else { l = 0; new_n->k = 0; }
PRINTF("newn-lastseqno %d newn-m %d newn-k %d\n", new_n->last_seq_no, new_n->m, new_n->k);
uint8_t lost_p;
for(lost_p = 0; lost_p < l; lost_p++) { n->cost *= alpha; }
new_n->cost = n->cost * alpha + (1 - alpha);
PRINTF("l %d cost %f\n", l, new_n->cost);
if (n->count_lock == 1) {
new_n->count = n->count;
} else { new_n->count = n->count + 1; }
new_n->first_time_stamp = n->first_time_stamp;
new_n->last_seq_no = crtseqno;
new_n->last_time_stamp = clock_time();
new_n->rate = (new_n->count + new_n->m) / (new_n->last_time_stamp - new_n->first_time_stamp);
new_n->cost_lock = 1;
list_remove(p->neighbor_list, n);
memb_free(&p->neighbor_mem, n);
list_push(p->neighbor_list, new_n);
print_list(p->neighbor_list);
return;
}
}
new_n->count = 1;
new_n->cost = 1;
new_n->m = 0;
new_n->k = 0;
new_n->last_seq_no = crtseqno;
new_n->rate = 1 / clock_time();
new_n->last_time_stamp = clock_time();
new_n->cost_lock = 1;
new_n->first_time_stamp = new_n->last_time_stamp;
/*If neighbor is not in the list and list is full, remove from list before adding*/
if (list_len >= NUM_NEIGHBOR_ENTRIES) {
for(n = list_head(p->neighbor_list); n != NULL; n = list_item_next(n)) {
if (highest_cost == n->cost) {
list_remove(p->neighbor_list, n);
memb_free(&p->neighbor_mem, n);
}
}
}
list_push(p->neighbor_list, new_n);
print_list(p->neighbor_list);
}
/*---------------------------------------------------------------------------*/
void
c_lqe_ewma_sent(struct pipe *p, struct stackmodule_i *module) {
PRINTF("c_lqe_ewma_sent\n");
}