Simple code for comunication via TCP between the mbed and PC.
Dependencies: EthernetInterface SimpleSocket mbed-rtos mbed
Fork of SimpleSocketExamples by
examples/ntpclient.cpp
- Committer:
- yamaguch
- Date:
- 2013-02-04
- Revision:
- 0:6dc3cfd058c6
File content as of revision 0:6dc3cfd058c6:
#include "SimpleSocket.h" void ntpclient() { char *NTP_SERVER = "pool.ntp.org"; printf("ntp server = %s\n", NTP_SERVER); while (true) { DatagramSocket datagram; char buf[48] = {0x23}; // 00100011 LI(0), Version(4), Mode(3: Client) datagram.write(buf, sizeof(buf)); datagram.send(NTP_SERVER, 123); //datagram.setTimeout(5.0); if (datagram.receive() > 0) { if (datagram.read(buf, sizeof(buf)) > 0) { unsigned long seconds = 0; for (int i = 40; i <= 43; i++) seconds = (seconds << 8) | buf[i]; set_time(time_t(seconds - 2208988800ULL)); char timestamp[16]; time_t jstime = time(NULL) + 9 * 3600; strftime(timestamp, sizeof(timestamp), "%m/%d %X", localtime(&jstime)); printf("Time: %s\n", timestamp); break; } } else { printf("no answer\n"); wait(1.0); } } }