Revision 0:cf516d904427, committed 2017-10-23

Comitter:

deepikabhavnani

Date:

Mon Oct 23 21:26:36 2017 +0000

Commit message:

UDP Socket example - Initial commit

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Mon Oct 23 21:26:36 2017 +0000
@@ -0,0 +1,4 @@
+.build
+.mbed
+projectfiles
+*.py*

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Mon Oct 23 21:26:36 2017 +0000
@@ -0,0 +1,10 @@
+### Getting started with the UDPSocket API ###
+ 
+UDP Example
+This application reads the current UTC time by sending UDP packet to 
+"time.nist.gov" address at port 37.
+ 
+**Note:** The current example is limited to the ethernet interface on supported 
+devices. To use the example with a different interface, you will need to modify 
+main.cpp and replace the EthernetInterface class with the appropriate interface.
+ 
\ No newline at end of file

Binary file img/uvision.png has changed

--- /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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Oct 23 21:26:36 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#6e0d01cd13e8aca7bf4d697c3699ec9225386881