As the matter of fact, our experienced technical professionals are well qualified and ready to provide appropriate guidance in networking. Without any delay, let’s see the process of fixing the packet delay in networking over this article.
The time delay among the packet data goes from one place to another place is called packet delay and it is referred as the latency. The round trip and one way are denoted as the two types of packet delay in the communication networks.
For instance, we have showcased the sample C++ source code for packet delay based on Cooja.
static void handle_time(struct msghdr *msg) {
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg); cmsg;
cmsg = CMSG_NXTHDR(msg, cmsg)) {
printf("level=%d, type=%d, len=%zu\n",
cmsg->cmsg_level, cmsg->cmsg_type,
cmsg->cmsg_len);
if (cmsg->cmsg_level == SOL_IP &&
cmsg->cmsg_type == IP_RECVERR) {
struct sock_extended_err *ext =
(struct sock_extended_err *)CMSG_DATA(cmsg);
printf("errno=%d, origin=%d\n", ext->ee_errno, ext->ee_origin);
continue;
}
if (cmsg->cmsg_level != SOL_SOCKET)
continue;
switch (cmsg->cmsg_type) {
case SO_TIMESTAMPNS: {
struct scm_timestamping *ts = (struct scm_timestamping *)CMSG_DATA(cmsg);
handle_scm_timestamping(ts);
} break;
case SO_TIMESTAMPING: {
struct scm_timestamping *ts = (struct scm_timestamping *)CMSG_DATA(cmsg);
handle_scm_timestamping(ts);
} break;
default:
/* Ignore other cmsg options */
break;
}
}
printf("End messages\n");
}
static ssize_t udp_receive(socket_info *inf, char *buf, size_t len) {
char ctrl[2048];
struct iovec iov = (struct iovec){.iov_base = buf, .iov_len = len};
struct msghdr msg = (struct msghdr)
{.msg_control = ctrl,
.msg_controllen = sizeof ctrl,
.msg_name = &inf->remote,
.msg_namelen = sizeof inf->remote,
.msg_iov = &iov,
.msg_iovlen = 1};
ssize_t recv_len = recvmsg(inf->fd, &msg, 0);
gettimeofday(&inf->time_user, NULL);
if (recv_len < 0) {
inf->err_no = errno;
fprintf(stderr, "udp_receive: recvfrom failed: %s\n",
strerror(inf->err_no));
}
handle_time(&msg);
return recv_len;
}
static ssize_t udp_send(socket_info *inf, char *buf, size_t len) {
struct iovec iov = (struct iovec){.iov_base = buf, .iov_len = len};
struct msghdr msg = (struct msghdr)
{.msg_name = &inf->remote,
.msg_namelen = sizeof inf->remote,
.msg_iov = &iov,
.msg_iovlen = 1};
gettimeofday(&inf->time_user, NULL);
ssize_t send_len = sendmsg(inf->fd, &msg, 0);
if (send_len < 0) {
inf->err_no = errno;
fprintf(stderr, "udp_send: sendmsg failed: %s\n", strerror(inf->err_no));
}
return send_len;
}
In addition, we have highlighted the console based Cooja result based on the packet delay in networking.
Don’t worry if you’ve any doubts, because our technical experts are always ready to help you out.