This is a quick example of a simple HTTP client program using the network-socket API that is provided as a part of mbed-os. The program brings up an underlying network interface, and uses it to perform an HTTP transaction over a TCPSocket.

Files at this revision

API Documentation at this revision

Comitter:
mbed_official
Date:
Tue Mar 12 13:00:15 2019 +0000
Parent:
71:694ada6df2cd
Child:
73:03f443752d8a
Commit message:
Replace ipify.com with an ipv6-compliant ifconfig.io

.
Commit copied from https://github.com/ARMmbed/mbed-os-example-sockets

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
--- a/main.cpp	Mon Feb 25 16:41:42 2019 +0000
+++ b/main.cpp	Tue Mar 12 13:00:15 2019 +0000
@@ -39,10 +39,10 @@
     printf("Netmask: %s\n", netmask ? netmask : "None");
     printf("Gateway: %s\n", gateway ? gateway : "None");
 
-    // Open a socket on the network interface, and create a TCP connection to api.ipify.org
+    // Open a socket on the network interface, and create a TCP connection to ifconfig.io
     TCPSocket socket;
     // Send a simple http request
-    char sbuffer[] = "GET / HTTP/1.1\r\nHost: api.ipify.org\r\nConnection: close\r\n\r\n";
+    char sbuffer[] = "GET / HTTP/1.1\r\nHost: ifconfig.io\r\nConnection: close\r\n\r\n";
     nsapi_size_t size = strlen(sbuffer);
 
     result = socket.open(net);
@@ -50,7 +50,7 @@
         printf("Error! socket.open() returned: %d\n", result);
     }
 
-    result = socket.connect("api.ipify.org", 80);
+    result = socket.connect("ifconfig.io", 80);
     if (result != 0) {
         printf("Error! socket.connect() returned: %d\n", result);
         goto DISCONNECT;
@@ -71,7 +71,7 @@
     remaining = 256;
     rcount = 0;
     p = buffer;
-    while (0 < (result = socket.recv(p, remaining))) {
+    while (remaining > 0 && 0 < (result = socket.recv(p, remaining))) {
         p += result;
         rcount += result;
         remaining -= result;
@@ -83,9 +83,6 @@
 	// the HTTP response code
     printf("recv %d [%.*s]\n", rcount, strstr(buffer, "\r\n")-buffer, buffer);
 
-    // The api.ipify.org service also gives us the device's external IP address
-    p = strstr(buffer, "\r\n\r\n")+4;
-    printf("External IP address: %.*s\n", rcount-(p-buffer), p);
     delete[] buffer;
 
 DISCONNECT: