udp.c
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/*
* Copyright (C) 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup examples
* @{
*
* @file
* @brief Demonstrating the sending and receiving of UDP data over POSIX sockets.
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*
* @}
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "common.h"
#include "od.h"
#include "net/af.h"
#include "net/sock/udp.h"
#include "net/ipv6.h"
#include "thread.h"
#include "xtimer.h"
#ifdef MODULE_EMB6_SOCK_UDP
static char sock_inbuf[SOCK_INBUF_SIZE];
static bool server_running;
static sock_udp_t server_sock;
static char server_stack[THREAD_STACKSIZE_DEFAULT];
static void *_server_thread(void *args)
{
int res;
/* parse port */
uint16_t port = atoi(args);
const sock_udp_ep_t server_addr = { .family = AF_INET6,
.port = port };
if ((res = sock_udp_create(&server_sock, &server_addr, NULL, 0)) < 0) {
printf("Unable to open UDP server on port %" PRIu16 " (error code %d)\n",
port, -res);
return NULL;
}
server_running = true;
printf("Success: started UDP server on port %" PRIu16 "\n", port);
while (1) {
sock_udp_ep_t client_addr;
if ((res = sock_udp_recv(&server_sock, sock_inbuf, sizeof(sock_inbuf),
SOCK_NO_TIMEOUT, &client_addr)) < 0) {
puts("Error on receive");
}
else if (res == 0) {
puts("No data received");
}
else {
char addrstr[IPV6_ADDR_MAX_STR_LEN];
printf("Received from [%s]:%" PRIu16 ":\n",
ipv6_addr_to_str(addrstr, (ipv6_addr_t *)&client_addr.addr,
sizeof(addrstr)), client_addr.port);
od_hex_dump(sock_inbuf, res, 0);
}
}
return NULL;
}
static int udp_send(char *addr_str, char *port_str, char *data, unsigned int num,
unsigned int delay)
{
uint8_t byte_data[strlen(data) / 2];
sock_udp_ep_t dst = { .family = AF_INET6 };
size_t data_len;
/* parse destination address */
if (ipv6_addr_from_str((ipv6_addr_t *)&dst.addr, addr_str) == NULL) {
puts("Error: unable to parse destination address");
return 1;
}
/* parse port */
dst.port = atoi(port_str);
data_len = hex2ints(byte_data, data);
for (unsigned int i = 0; i < num; i++) {
if (sock_udp_send(NULL, byte_data, data_len, &dst) < 0) {
puts("could not send");
}
else {
printf("Success: send %u byte to [%s]:%" PRIu16 ")\n",
(unsigned)data_len, addr_str, dst.port);
}
xtimer_usleep(delay);
}
return 0;
}
static int udp_start_server(char *port_str)
{
if (thread_create(server_stack, sizeof(server_stack), THREAD_PRIORITY_MAIN - 1,
THREAD_CREATE_STACKTEST, _server_thread, port_str,
"UDP server") <= KERNEL_PID_UNDEF) {
return 1;
}
return 0;
}
int udp_cmd(int argc, char **argv)
{
if (argc < 2) {
printf("usage: %s [send|server]\n", argv[0]);
return 1;
}
if (strcmp(argv[1], "send") == 0) {
uint32_t num = 1;
uint32_t delay = 1000000;
if (argc < 5) {
printf("usage: %s send <addr> <port> <hex data> [<num> [<delay in us>]]\n",
argv[0]);
return 1;
}
if (argc > 5) {
num = atoi(argv[5]);
}
if (argc > 6) {
delay = atoi(argv[6]);
}
return udp_send(argv[2], argv[3], argv[4], num, delay);
}
else if (strcmp(argv[1], "server") == 0) {
if (argc < 3) {
printf("usage: %s server [start|stop]\n", argv[0]);
return 1;
}
if (strcmp(argv[2], "start") == 0) {
if (argc < 4) {
printf("usage %s server start <port>\n", argv[0]);
return 1;
}
return udp_start_server(argv[3]);
}
else {
puts("error: invalid command");
return 1;
}
}
else {
puts("error: invalid command");
return 1;
}
}
#else
typedef int dont_be_pedantic;
#endif
/** @} */