nes-proj/examples/rpl-udp/udp-client.c

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#include "contiki.h"
#include "net/routing/routing.h"
#include "random.h"
#include "net/netstack.h"
#include "net/ipv6/simple-udp.h"
#include "sys/log.h"
#define LOG_MODULE "App"
#define LOG_LEVEL LOG_LEVEL_INFO
#define WITH_SERVER_REPLY 1
#define UDP_CLIENT_PORT 8765
#define UDP_SERVER_PORT 5678
#define SEND_INTERVAL (60 * CLOCK_SECOND)
static struct simple_udp_connection udp_conn;
/*---------------------------------------------------------------------------*/
PROCESS(udp_client_process, "UDP client");
AUTOSTART_PROCESSES(&udp_client_process);
/*---------------------------------------------------------------------------*/
static void
udp_rx_callback(struct simple_udp_connection *c,
const uip_ipaddr_t *sender_addr,
uint16_t sender_port,
const uip_ipaddr_t *receiver_addr,
uint16_t receiver_port,
const uint8_t *data,
uint16_t datalen)
{
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LOG_INFO("Received response '%.*s' from ", datalen, (char *) data);
LOG_INFO_6ADDR(sender_addr);
#if LLSEC802154_CONF_ENABLED
LOG_INFO_(" LLSEC LV:%d", uipbuf_get_attr(UIPBUF_ATTR_LLSEC_LEVEL));
#endif
LOG_INFO_("\n");
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(udp_client_process, ev, data)
{
static struct etimer periodic_timer;
static unsigned count;
static char str[32];
uip_ipaddr_t dest_ipaddr;
PROCESS_BEGIN();
/* Initialize UDP connection */
simple_udp_register(&udp_conn, UDP_CLIENT_PORT, NULL,
UDP_SERVER_PORT, udp_rx_callback);
etimer_set(&periodic_timer, random_rand() % SEND_INTERVAL);
while(1) {
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&periodic_timer));
if(NETSTACK_ROUTING.node_is_reachable() && NETSTACK_ROUTING.get_root_ipaddr(&dest_ipaddr)) {
/* Send to DAG root */
LOG_INFO("Sending request %u to ", count);
LOG_INFO_6ADDR(&dest_ipaddr);
LOG_INFO_("\n");
snprintf(str, sizeof(str), "hello %d", count);
simple_udp_sendto(&udp_conn, str, strlen(str), &dest_ipaddr);
count++;
} else {
LOG_INFO("Not reachable yet\n");
}
/* Add some jitter */
etimer_set(&periodic_timer, SEND_INTERVAL
- CLOCK_SECOND + (random_rand() % (2 * CLOCK_SECOND)));
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/