![](/media/cache/group/mbed-logo-square-512_3.png.50x50_q85.png)
UDP Socket application to read current time from network.
main.cpp
- Committer:
- deepikabhavnani
- Date:
- 2017-10-23
- Revision:
- 0:cf516d904427
File content as of revision 0:cf516d904427:
#include "mbed.h" #include "EthernetInterface.h" // Network interface EthernetInterface net; // Time protocol implementation : Address: time.nist.gov UDPPort: 37 typedef struct { uint32_t secs; // Transmit Time-stamp seconds. }ntp_packet; int main() { // Bring up the ethernet interface printf("UDP Socket example\n"); if(0 != net.connect()) { printf("Error connecting\n"); return -1; } // Show the network address const char *ip = net.get_ip_address(); printf("IP address is: %s\n", ip ? ip : "No IP"); UDPSocket sock(&net); SocketAddress sockAddr; char out_buffer[] = "time"; if(0 > sock.sendto("time.nist.gov", 37, out_buffer, sizeof(out_buffer))) { printf("Error sending data\n"); return -1; } ntp_packet in_data; int n = sock.recvfrom(&sockAddr, &in_data, sizeof(ntp_packet)); in_data.secs = ntohl( in_data.secs ) - 2208988800; // 1900-1970 printf("Time Received %lu seconds since 1/01/1900 00:00 GMT\n", (uint32_t)in_data.secs); printf("Time = %s", ctime(( const time_t* )&in_data.secs)); printf("Time Server Address: %s Port: %d\n\r", sockAddr.get_ip_address(), sockAddr.get_port()); // Close the socket and bring down the network interface sock.close(); net.disconnect(); return 0; }