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Unity3D tweaks, test app updates

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This commit is contained in:
Joseph Henry
2016-07-18 12:24:24 -07:00
parent b8747670b3
commit 89ab08e3b2
7 changed files with 39 additions and 588 deletions
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19
integrations/Unity3D/Assets/ZeroTierNetworkInterface.cs
View File

@@ -208,35 +208,22 @@ public class ZeroTierNetworkInterface {
}
// Initialize the ZeroTier service with a given path
public ZeroTierNetworkInterface(string path, string nwid)
{
public ZeroTierNetworkInterface(string path, string nwid) {
this.path = path;
this.nwid = nwid;
Init();
}
public ZeroTierNetworkInterface (string path)
{
public ZeroTierNetworkInterface (string path) {
this.path = path;
Init();
}
// Initialize the ZeroTier service
public ZeroTierNetworkInterface()
{
public ZeroTierNetworkInterface() {
Init();
}
// Initialize the ZeroTier service
// Use the GlobalConfig to set things like the max packet size
/*
public ZeroTierNetworkInterface(GlobalConfig gConfig)
{
MaxPacketSize = gConfig.MaxPacketSize; // TODO: Do something with this!
Init();
}
*/
#region Network Handling
// Joins a ZeroTier virtual network
public bool JoinNetwork(string nwid)

1
make-mac.mk
View File

@@ -156,7 +156,6 @@ clean:
-find . -type f \( -name '*.o' -o -name '*.so' -o -name '*.o.d' -o -name '*.out' -o -name '*.log' \) -delete
# android JNI lib project
test -s /usr/bin/javac || { echo "Javac not found"; exit 1; }
-cd $(INT)/android/android_jni_lib/proj; ./gradlew clean

542
tests/httpstub.c
View File

@@ -1,542 +0,0 @@
/* A simple http server for performance test.
Copyright (C) 2013 Sun, Junyi <ccnusjy@gmail.com> */
/* https://github.com/fxsjy/httpstub */
#include <sys/time.h>
#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/sendfile.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <net/if.h>
#include <fcntl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <assert.h>
#include <signal.h>
#include <sys/epoll.h>
#include <pthread.h>
#include <errno.h>
#define MAX_EPOLL_FD 4096
#define MAX_BUF_SIZE (1<<20)
#define WORKER_COUNT 2
int ep_fd[WORKER_COUNT],listen_fd;
int g_delay;
int g_shutdown_flag;
int g_quiet;
FILE *g_logger;
int g_pipe[WORKER_COUNT][2];
enum version_t {
HTTP_1_0 = 10,
HTTP_1_1 = 11
};
struct io_data_t {
int fd;
struct sockaddr_in addr;
char *in_buf;
char *out_buf;
int in_buf_cur;
int out_buf_cur;
int out_buf_total;
int keep_alive;
enum version_t version;
};
struct slice_t {
char *begin;
size_t size;
};
struct thread_data_t{
struct slice_t data_from_file;
int myep_fd;
int mypipe_fd;
};
static void *handle_io_loop(void *param);
static void httpstub_log(const char *fmt, ...);
static void setnonblocking(int fd)
{
int opts;
opts = fcntl(fd, F_GETFL);
if (opts < 0) {
fprintf(stderr, "fcntl failed\n");
return;
}
opts = opts | O_NONBLOCK;
if (fcntl(fd, F_SETFL, opts) < 0) {
fprintf(stderr, "fcntl failed\n");
return;
}
return;
}
static void usage()
{
printf("usage: httpstub -p <port> -f <data file> -d <delay (ms)> [-q quiet] \n");
}
static struct slice_t load_data(char *fname)
{
struct stat buf;
char *bin = NULL;
FILE *fptr;
int ret;
struct slice_t result;
ret = stat(fname, &buf);
if (ret < 0) {
printf("open %s failed\n", fname);
perror("");
exit(1);
}
printf(">> size of %s is %d\n", fname, (int)buf.st_size);
if (buf.st_size <= 0) {
printf("the file is empty or broken\n");
exit(1);
}
if (buf.st_size <= 0 || buf.st_size > MAX_BUF_SIZE) {
printf("file is too large\n");
exit(1);
}
bin = (char *)malloc(sizeof(char) * buf.st_size + 1);
bin[buf.st_size] = '\0';
result.size = buf.st_size;
result.begin = bin;
fptr = fopen(fname, "rb");
if(fread(bin, buf.st_size, 1, fptr)<=0){
perror("failed to read file");
exit(1);
};
fclose(fptr);
return result;
}
static struct io_data_t * alloc_io_data(int client_fd, struct sockaddr_in *client_addr)
{
struct io_data_t *io_data_ptr = (struct io_data_t *)malloc(sizeof(struct io_data_t));
io_data_ptr->fd = client_fd;
io_data_ptr->in_buf = (char *)malloc(4096);
io_data_ptr->out_buf = (char *)malloc(MAX_BUF_SIZE);
io_data_ptr->in_buf_cur = 0;
io_data_ptr->out_buf_cur = 0;
io_data_ptr->keep_alive = 1;
if (client_addr)
io_data_ptr->addr = *client_addr;
return io_data_ptr;
}
static void destroy_io_data(struct io_data_t *io_data_ptr)
{
if(NULL == io_data_ptr)return;
if(io_data_ptr->in_buf)free(io_data_ptr->in_buf);
if(io_data_ptr->out_buf)free(io_data_ptr->out_buf);
io_data_ptr->in_buf = NULL;
io_data_ptr->out_buf = NULL;
free(io_data_ptr);
}
void exit_hook(int number)
{
close(listen_fd);
g_shutdown_flag=1;
printf(">> [%d]will shutdown...[%d]\n", getpid(),number);
}
int main(int argc, char **argv)
{
const char *ip_binding = "0.0.0.0";
int port_listening = 8402;
char *data_file=NULL;
int opt;
int on = 1;
int client_fd=0;
int worker_count=WORKER_COUNT,i;
register int worker_pointer = 0;
struct sockaddr_in server_addr;
struct slice_t data_from_file;
pthread_t tid[WORKER_COUNT];
pthread_attr_t tattr[WORKER_COUNT];
struct thread_data_t tdata[WORKER_COUNT];
char ip_buf[256] = { 0 };
struct sockaddr_in client_addr;
socklen_t client_n;
g_delay = 0;
g_shutdown_flag = 0;
if (argc == 1) {
usage();
return 1;
}
g_quiet = 0;
while ((opt = getopt(argc, argv, "l:p:f:d:hq")) != -1) {
switch (opt) {
case 'l':
ip_binding = strdup(optarg);
break;
case 'p':
port_listening = atoi(optarg);
if (port_listening == 0) {
printf(">> invalid port : %s\n", optarg);
exit(1);
}
break;
case 'f':
data_file = strdup(optarg);
break;
case 'd':
g_delay = atoi(optarg);
break;
case 'q':
g_quiet = 1;
break;
case 'h':
usage();
return 1;
}
}
printf(">> IP listening:%s\n", ip_binding);
printf(">> port: %d\n", port_listening);
printf(">> data_file: %s\n", data_file);
printf(">> reponse delay(MS): %d\n", g_delay);
printf(">> quite:%d\n",g_quiet);
if (NULL == data_file || strlen(data_file) == 0) {
printf("\033[31m-data file is needed!~ \033[0m\n");
usage();
return 1;
}
g_logger = fopen("stub.log", "a");
if (g_logger ==NULL) {
perror("create log file stub.log failed.");
exit(1);
}
data_from_file = load_data(data_file);
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, exit_hook);
signal(SIGKILL, exit_hook);
signal(SIGQUIT, exit_hook);
signal(SIGTERM, exit_hook);
signal(SIGHUP, exit_hook);
for(i=0;i<WORKER_COUNT;i++){
if(pipe(g_pipe[i])<0){
perror("failed to create pipe");
exit(1);
}
}
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (-1 == listen_fd) {
perror("listen faild!");
exit(-1);
}
setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
setsockopt(listen_fd, IPPROTO_TCP, TCP_NODELAY, (int[]) {1}, sizeof(int));
setsockopt(listen_fd, IPPROTO_TCP, TCP_QUICKACK, (int[]) {1}, sizeof(int));
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons((short)port_listening);
server_addr.sin_addr.s_addr = inet_addr(ip_binding);
if (-1 == bind(listen_fd, (struct sockaddr *)&server_addr, sizeof(server_addr))) {
perror("bind error");
exit(-1);
}
if (-1 == listen(listen_fd, 32)) {
perror("listen error");
exit(-1);
}
for(i=0;i<worker_count;i++){
ep_fd[i] = epoll_create(MAX_EPOLL_FD);
if(ep_fd[i]<0){
perror("epoll_create failed.");
exit(-1);
}
}
for(i=0;i<worker_count;i++){
pthread_attr_init(tattr+i);
pthread_attr_setdetachstate(tattr+i, PTHREAD_CREATE_JOINABLE);
tdata[i].data_from_file = data_from_file;
tdata[i].myep_fd = ep_fd[i];
tdata[i].mypipe_fd = g_pipe[i][0];
if (pthread_create(tid+i, tattr+i, handle_io_loop, tdata+i ) != 0) {
fprintf(stderr, "pthread_create failed\n");
return -1;
}
}
while(1){
if ((client_fd = accept(listen_fd, (struct sockaddr *)&client_addr, &client_n)) > 0) {
if(write(g_pipe[worker_pointer][1],(char*)&client_fd,4)<0){
perror("failed to write pipe");
exit(1);
}
inet_ntop(AF_INET, &client_addr.sin_addr, ip_buf, sizeof(ip_buf));
httpstub_log("[CONN]Connection from %s", ip_buf);
worker_pointer++;
if(worker_pointer == worker_count) worker_pointer=0;
}
else if(errno == EBADF && g_shutdown_flag){
break;
}
else{
if(0 == g_shutdown_flag){
perror("please check ulimit -n");
sleep(1);
}
}
}
free(data_from_file.begin);
for(i=0; i< worker_count; i++){
close(ep_fd[i]);
}
if(client_fd<0 && 0==g_shutdown_flag){
perror("Accep failed, try ulimit -n");
httpstub_log("[ERROR]too many fds open, try ulimit -n");
g_shutdown_flag = 1;
}
fclose(g_logger);
printf(">> [%d]waiting worker thread....\n",getpid());
for(i=0; i< worker_count; i++)
pthread_join(tid[i], NULL);
printf(">> [%d]Bye~\n",getpid());
return 0;
}
static void destroy_fd(int myep_fd, int client_fd, struct io_data_t *data_ptr, int case_no)
{
struct epoll_event ev;
ev.data.ptr = data_ptr;
epoll_ctl(myep_fd, EPOLL_CTL_DEL, client_fd, &ev);
shutdown(client_fd, SHUT_RDWR);
close(client_fd);
destroy_io_data(data_ptr);
httpstub_log("[DEBUG] close case %d",case_no);
}
static void httpstub_log(const char *fmt, ...)
{
if(0 == g_quiet){
char msg[4096];
char buf[64];
time_t now = time(NULL);
va_list ap;
va_start(ap, fmt);
vsnprintf(msg, sizeof(msg), fmt, ap);
va_end(ap);
strftime(buf, sizeof(buf), "%d %b %H:%M:%S", localtime(&now));
fprintf(g_logger, "[%d] %s %s\n", (int)getpid(), buf, msg);
fflush(g_logger);
}
}
static void handle_output(int myep_fd, struct io_data_t *client_io_ptr)
{
int cfd, ret, case_no;
struct epoll_event ev;
cfd = client_io_ptr->fd;
ret = send(cfd, client_io_ptr->out_buf + client_io_ptr->out_buf_cur, client_io_ptr->out_buf_total - client_io_ptr->out_buf_cur, MSG_NOSIGNAL);
if (ret >= 0)
client_io_ptr->out_buf_cur += ret;
httpstub_log("[DEBUG]out_buf_cur %d", client_io_ptr->out_buf_cur);
httpstub_log("[DEBUG]out_buf_total %d", client_io_ptr->out_buf_total);
//printf("ret:%d\n",ret);
//printf("errno:%d\n", errno);
if (0 == ret || (ret < 0 && errno != EAGAIN && errno != EWOULDBLOCK)) {
//printf("loose 2\n");
case_no = 2;
//perror("send");
//printf("cfd: %d\n", cfd);
destroy_fd(myep_fd, cfd, client_io_ptr, case_no);
return;
}
if (client_io_ptr->out_buf_cur == client_io_ptr->out_buf_total) { //have sent all
httpstub_log("[NOTICE] all messages have been sent.(%d bytes)", client_io_ptr->out_buf_total);
//printf("alive: %d\n", client_io_ptr->keep_alive);
if (client_io_ptr->version == HTTP_1_0 && 0 == client_io_ptr->keep_alive) {
case_no = 4;
destroy_fd(myep_fd, cfd, client_io_ptr, case_no);
return;
}
ev.data.ptr = client_io_ptr;
ev.events = EPOLLIN;
epoll_ctl(myep_fd, EPOLL_CTL_MOD, cfd, &ev);
}
}
static void handle_input(int myep_fd, struct io_data_t *client_io_ptr, struct slice_t data_from_file, const char *rsps_msg_fmt, int delay)
{
int npos = 0;
int total = 0;
int ret = 0;
int case_no = 0;
char headmsg[256];
char *sep = NULL;
const char *CRLF = "\r\n\r\n";
const char *LF = "\n\n";
const char *sep_flag=NULL;
struct epoll_event ev;
int cfd = client_io_ptr->fd;
int pkg_len = 0;
assert(client_io_ptr->in_buf_cur >= 0);
ret = recv(cfd, client_io_ptr->in_buf + client_io_ptr->in_buf_cur, 512, MSG_DONTWAIT);
//printf("%u\n",(unsigned int)pthread_self());
if (0 == ret || (ret < 0 && errno != EAGAIN && errno != EWOULDBLOCK)) {
case_no = 1;
//perror("++++++++");
destroy_fd(myep_fd, cfd, client_io_ptr, case_no);
return;
}
client_io_ptr->in_buf_cur += ret;
client_io_ptr->in_buf[client_io_ptr->in_buf_cur] = '\0';
sep = strstr(client_io_ptr->in_buf, CRLF);
if (NULL == sep) {
sep = strstr(client_io_ptr->in_buf, LF);
if (NULL == sep)
return;
else
sep_flag = LF;
} else {
sep_flag = CRLF;
}
if (strstr(client_io_ptr->in_buf, "GET ") == client_io_ptr->in_buf) {
if (strstr(client_io_ptr->in_buf, "HTTP/1.0") != NULL) {
client_io_ptr->version = HTTP_1_0;
if (NULL == strstr(client_io_ptr->in_buf, "Connection: Keep-Alive")) {
client_io_ptr->keep_alive = 0;
}
} else {
client_io_ptr->version = HTTP_1_1;
}
}
npos = strcspn(client_io_ptr->in_buf, "\r\n");
if (npos > 250)
npos = 250;
memcpy(headmsg, client_io_ptr->in_buf, npos);
headmsg[npos] = '\0';
httpstub_log("[RECV] %s ", headmsg);
pkg_len = sep - client_io_ptr->in_buf + strlen(sep_flag);
assert(pkg_len >= 0);
assert(client_io_ptr->in_buf_cur - pkg_len >= 0);
memmove(client_io_ptr->in_buf, sep + strlen(sep_flag), client_io_ptr->in_buf_cur - pkg_len);
client_io_ptr->in_buf_cur -= pkg_len;
client_io_ptr->out_buf_cur = 0;
total = snprintf(client_io_ptr->out_buf, MAX_BUF_SIZE, rsps_msg_fmt, data_from_file.size);
memcpy(client_io_ptr->out_buf + total, data_from_file.begin, data_from_file.size);
total += data_from_file.size;
httpstub_log("[DEBUG]total:%d", total);
client_io_ptr->out_buf_total = total;
ev.data.ptr = client_io_ptr;
ev.events = EPOLLOUT;
epoll_ctl(myep_fd, EPOLL_CTL_MOD, cfd, &ev);
if (delay > 0) {
//printf("usleep: %d\n",(int)(g_delay*2000/nfds) );
usleep(delay);
}
}
static void * handle_io_loop(void *param)
{
register int i;
int cfd, nfds, case_no, new_sock_fd;
struct epoll_event events[MAX_EPOLL_FD],ev;
const char *rsps_msg_fmt = "HTTP/1.1 200 OK\r\nContent-Length: %d\r\nConnection: Keep-Alive\r\nContent-Type: text/plain\r\n\r\n";
struct io_data_t *client_io_ptr;
struct thread_data_t my_tdata = *(struct thread_data_t*)param;
ev.data.fd = my_tdata.mypipe_fd;
ev.events = EPOLLIN;
epoll_ctl(my_tdata.myep_fd,EPOLL_CTL_ADD,my_tdata.mypipe_fd,&ev);
while (1) {
nfds = epoll_wait(my_tdata.myep_fd, events, MAX_EPOLL_FD, 1000);
//printf("nfds:%d, epoll fd:%d\n",nfds,my_tdata.myep_fd);
if(nfds<=0 && 0!=g_shutdown_flag){
break;
}
for (i = 0; i < nfds && nfds>0; i++) {
if( (events[i].data.fd == my_tdata.mypipe_fd) && (events[i].events & EPOLLIN)){
if(read(my_tdata.mypipe_fd,&new_sock_fd,4)==-1){
perror("faild to read pipe");
exit(1);
}
setnonblocking(new_sock_fd);
ev.data.ptr = alloc_io_data(new_sock_fd, (struct sockaddr_in *)NULL);
ev.events = EPOLLIN;
epoll_ctl(my_tdata.myep_fd, EPOLL_CTL_ADD, new_sock_fd, &ev);
continue;
}
client_io_ptr = (struct io_data_t *)events[i].data.ptr;
if(client_io_ptr->fd<=0) continue;
if (events[i].events & EPOLLIN) {
handle_input(my_tdata.myep_fd, client_io_ptr, my_tdata.data_from_file, rsps_msg_fmt, (int)(g_delay * 1000 / nfds));
} else if (events[i].events & EPOLLOUT) {
handle_output(my_tdata.myep_fd, client_io_ptr);
} else if (events[i].events & EPOLLERR) {
cfd = client_io_ptr->fd;
case_no = 3;
destroy_fd(my_tdata.myep_fd, cfd, client_io_ptr, case_no);
}
}
}
return NULL;
}

18
tests/tcp_client.c
View File

@@ -5,6 +5,9 @@
#include <sys/socket.h>
#include <arpa/inet.h>
int atoi(const char *str);
int close(int filedes);
int main(int argc , char *argv[])
{
if(argc < 3) {
@@ -18,7 +21,7 @@ int main(int argc , char *argv[])
sock = socket(AF_INET , SOCK_STREAM , 0);
if (sock == -1) {
printf("Could not create socket");
printf("could not create socket");
}
server.sin_addr.s_addr = inet_addr(argv[1]);
server.sin_family = AF_INET;
@@ -29,29 +32,28 @@ int main(int argc , char *argv[])
perror("connect failed. Error");
return 1;
}
puts("Connected\n");
printf("connected\n");
char *msg = "welcome to the machine!";
while(1) {
printf("Enter message : ");
printf("enter message : ");
scanf("%s" , message);
// TX
if(send(sock, msg, sizeof(msg), 0) < 0) {
puts("Send failed");
printf("send failed");
return 1;
}
else {
printf("len = %d\n", strlen(message));
printf("len = %ld\n", strlen(message));
}
// RX
if(recv(sock , server_reply , 2000 , 0) < 0) {
puts("recv failed");
printf("recv failed");
break;
}
puts("Server reply :");
printf("server reply :");
puts(server_reply);
}
close(sock);

18
tests/tcp_server.c
View File

@@ -6,11 +6,13 @@
#include <arpa/inet.h>
#include <unistd.h>
int atoi(const char *str);
int main(int argc , char *argv[])
{
if(argc < 2) {
printf("usage: tcp_server <port>\n");
exit(0);
return 0;
}
int socket_desc, client_sock, c, read_size, port = atoi(argv[1]);
@@ -19,8 +21,8 @@ int main(int argc , char *argv[])
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
if (socket_desc == -1) {
printf("Could not create socket");
exit(0);
printf("could not create socket");
return 0;
}
server.sin_family = AF_INET;
@@ -30,23 +32,23 @@ int main(int argc , char *argv[])
printf("binding on port %d\n", port);
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) {
perror("bind failed. Error");
exit(0);
return 0;
}
printf("listening\n");
listen(socket_desc , 3);
puts("waiting to accept\n");
printf("waiting to accept\n");
c = sizeof(struct sockaddr_in);
client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
if (client_sock < 0) {
perror("accept failed");
exit(0);
return 0;
}
puts("connection accepted\n reading...\n");
printf("connection accepted\n reading...\n");
// RX
int bytes_read = recv(client_sock , client_message , 2000 , 0);
printf("Read (%d) bytes\n", bytes_read);
printf("read (%d) bytes\n", bytes_read);
for(int i=0; i<bytes_read; i++) {
printf("%c", client_message[i]);
}

6
tests/udp_client.c
View File

@@ -8,6 +8,8 @@
#include <unistd.h>
#include <string.h>
int atoi(const char *str);
int main(int argc, char * argv[])
{
if(argc < 3) {
@@ -49,8 +51,8 @@ int main(int argc, char * argv[])
return 1;
}
if (n_sent!=sizeof(msg))
printf("Sendto sent %d bytes\n",(int)n_sent);
printf("n_sent = %d, count = %d\n", n_sent,count);
printf("sendto sent %d bytes\n",(int)n_sent);
printf("n_sent = %ld, count = %d\n", n_sent,count);
}
// RX from server

23
tests/udp_server.c
View File

@@ -12,10 +12,10 @@
#define MAXBUF 1024*1024
void echo( int sd ) {
int len,n;
char bufin[MAXBUF];
struct sockaddr_in remote;
len = sizeof(remote);
int n;
socklen_t len = sizeof(remote);
long count = 0;
while (1) {
@@ -29,7 +29,7 @@ void echo( int sd ) {
if (n<0) {
perror("Error receiving data");
} else {
printf("GOT %d BYTES (count = %d)\n",n, count);
printf("GOT %d BYTES (count = %ld)\n", n, count);
// Got something, just send it back
// sendto(sd,bufin,n,0,(struct sockaddr *)&remote,len);
}
@@ -40,16 +40,17 @@ int main(int argc, char *argv[]) {
if(argc < 2) {
printf("usage: udp_server <port>\n");
exit(0);
return 0;
}
int ld, length, port = atoi(argv[1]);
int ld, port = atoi(argv[1]);
socklen_t len;
struct sockaddr_in skaddr;
struct sockaddr_in skaddr2;
// Create socket
if ((ld = socket( PF_INET, SOCK_DGRAM, 0)) < 0) {
printf("error creating socket\n");
exit(1);
return 0;
}
// Create address
skaddr.sin_family = AF_INET;
@@ -58,13 +59,13 @@ int main(int argc, char *argv[]) {
// Bind to address
if (bind(ld, (struct sockaddr *) &skaddr, sizeof(skaddr))<0) {
printf("error binding\n");
exit(0);
return 0;
}
// find out what port we were assigned
length = sizeof( skaddr2 );
if (getsockname(ld, (struct sockaddr *) &skaddr2, &length)<0) {
len = sizeof( skaddr2 );
if (getsockname(ld, (struct sockaddr *) &skaddr2, &len)<0) {
printf("error getsockname\n");
exit(1);
return 0;
}
// Display address:port to verify it was sent over RPC correctly
port = ntohs(skaddr2.sin_port);
@@ -74,7 +75,7 @@ int main(int argc, char *argv[]) {
d[1] = (ip >> 8) & 0xFF;
d[2] = (ip >> 16) & 0xFF;
d[3] = (ip >> 24) & 0xFF;
printf("Bound to address: %d.%d.%d.%d : %d\n", d[0],d[1],d[2],d[3], port);
printf("bound to address: %d.%d.%d.%d : %d\n", d[0],d[1],d[2],d[3], port);
// RX
echo(ld);