main.cpp

00001 #if !FEATURE_IPV4
00002     #error [NOT_SUPPORTED] IPV4 not supported for this target
00003 #endif
00004 
00005 #include "mbed.h"
00006 #include "EthernetInterface.h"
00007 #include "UDPSocket.h"
00008 #include "greentea-client/test_env.h"
00009 
00010 namespace {
00011     const char *HTTP_SERVER_NAME = "pool.ntp.org";
00012     const int HTTP_SERVER_PORT = 123;
00013 }
00014 
00015 
00016 int main() {
00017     GREENTEA_SETUP(60, "default_auto");
00018 
00019     bool result = false;
00020     const time_t TIME1970 = 2208988800L;
00021     int ntp_send_values[12] = {0};
00022     int ntp_recv_values[12] = {0};
00023 
00024     EthernetInterface eth;
00025     eth.connect();
00026     printf("UDP client IP Address is %s\n", eth.get_ip_address());
00027 
00028     UDPSocket sock;
00029     sock.open(&eth);
00030     sock.set_timeout(15000);
00031 
00032     SocketAddress nist(&eth, HTTP_SERVER_NAME, HTTP_SERVER_PORT);
00033 
00034     printf("UDP: NIST server %s address: %s on port %d\r\n", HTTP_SERVER_NAME, nist.get_ip_address(), nist.get_port());
00035 
00036     memset(ntp_send_values, 0x00, sizeof(ntp_send_values));
00037     ntp_send_values[0] = '\x1b';
00038 
00039     while(1) {
00040         memset(ntp_recv_values, 0x00, sizeof(ntp_recv_values));
00041 
00042         int ret_send = sock.sendto(nist, (void*)ntp_send_values, sizeof(ntp_send_values));
00043         printf("UDP: Sent %d Bytes to NTP server \n", ret_send);
00044 
00045         SocketAddress source;
00046         const int n = sock.recvfrom(&source, (void*)ntp_recv_values, sizeof(ntp_recv_values));
00047 
00048         printf("UDP: Recved from NTP server %d Bytes \n", n);
00049 
00050         if (n > 0 && strcmp(source.get_ip_address(), nist.get_ip_address()) == 0) {
00051             result = true;
00052 
00053             printf("UDP: Values returned by NTP server: \n");
00054             for (size_t i=0; i < sizeof(ntp_recv_values) / sizeof(ntp_recv_values[0]); ++i) {
00055                 printf("\t[%02d] 0x%X", i, ntohl(ntp_recv_values[i]));
00056 
00057                 if (i == 10) {
00058                     time_t timestamp = ntohl(ntp_recv_values[i]) - TIME1970;
00059                     printf("\tNTP timestamp is %s", ctime(&timestamp));
00060                 } else {
00061                     printf("\n");
00062                 }
00063             }
00064 
00065             break;
00066         }
00067 
00068         printf("Failed to receive data, retrying in 5 seconds...\n");
00069         wait(5);
00070     }
00071 
00072     sock.close();
00073     eth.disconnect();
00074     GREENTEA_TESTSUITE_RESULT(result);
00075 }