NIOSII/f Truncating UDP packets

Demonstration code is a standard SSS example with this task added.

void UDPTask()
{
	unsigned char packet[100];
	struct sockaddr_in addr_client = {0};
	int sizeof_addr_client = sizeof(addr_client);
	struct sockaddr_in addr_server = {AF_INET, htons(49213)};
	addr_server.sin_addr.s_addr = INADDR_ANY;

	int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	if (bind(sockfd, (struct sockaddr *)&addr_server, sizeof(addr_server)) < 0)
	{
	    printf("============================BIND FAILED\n");
	}
#define PING_SIZE	1100
	char ping[PING_SIZE];
	ping[0] = 0x04;
	ping[PING_SIZE-1] = 0x7c;

	printf("-----------------------UDP TASK\n");

	while(TRUE)
	{
		int n = recvfrom(sockfd, (char*)packet, 100, 0x100, (struct sockaddr *)&addr_client, &sizeof_addr_client);
		printf("----------------------MSG_IN %d %x\n", n, n>0 ? packet[0] : 0);
		sendto(sockfd, ping, sizeof(ping), 0x800, (struct sockaddr *) &addr_client, sizeof_addr_client);
	}
}