Diff: main.cpp

Revision:

0:cf516d904427

Child:

1:da6afd392792

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Oct 23 21:26:36 2017 +0000
@@ -0,0 +1,48 @@
+#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;
+}
\ No newline at end of file