devkitPro

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#include <nds.h>
#include <dswifi9.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

//---------------------------------------------------------------------------------
void waitButtonA() {
//---------------------------------------------------------------------------------
	while(1) {
		scanKeys();
		swiWaitForVBlank();
		if (keysDown() & KEY_A) break;
	}
}

//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------

	consoleDemoInit();

	printf("connecting ...\n");

	if(!Wifi_InitDefault(WFC_CONNECT)) {
		printf(" Failed to connect!\n");
		waitButtonA();
		return 0;
	}

	struct in_addr ip, gateway, mask, dns1, dns2;

	ip = Wifi_GetIPInfo(&gateway, &mask, &dns1, &dns2);
	printf("Connected: %s\n",inet_ntoa(ip));
	
	int sock_udp = socket(PF_INET, SOCK_DGRAM, 0);
	struct sockaddr_in sa_udp, sa_udp_remote;

	sa_udp.sin_family = AF_INET;
	sa_udp.sin_addr.s_addr = INADDR_ANY;
	sa_udp.sin_port = htons(17491);

	if(bind(sock_udp, (struct sockaddr*) &sa_udp, sizeof(sa_udp)) < 0) {
		printf(" UDP socket error\n");
		waitButtonA();
		return 0;
	}

	int i=1;

	ioctl(sock_udp,FIONBIO,&i);

	int dummy;
	char recvbuf[256];

	while(1) {
		int len = recvfrom(sock_udp, recvbuf, sizeof(recvbuf), 0, (struct sockaddr*) &sa_udp_remote, &dummy);

		if (len!=-1) {
			if (strncmp(recvbuf,"ping",strlen("ping")) == 0) {
				int respSock = socket(PF_INET, SOCK_DGRAM, 0);
				sa_udp_remote.sin_family=AF_INET;
				sa_udp_remote.sin_port=htons(17491);
				sendto(respSock, "pong", strlen("pong"), 0, (struct sockaddr*) &sa_udp_remote,sizeof(sa_udp_remote));
			}
		}

		swiWaitForVBlank();
		scanKeys();
		if (keysDown() & KEY_START) break;
	}
	return 0;
}