Nelson Neves
Simple code to demonstrate how to make an HTTP GET request to fetch a stream from an RSS feed. Note: Demo program to be used on the GeekSessionLab Talk (November 2011). http://devrendezvous.com/?lang=en
Dependencies: EthernetNetIf mbed
Revision 0:0946c896455e, committed 2011-10-27
- Comitter:
- botdream
- Date:
- Thu Oct 27 22:37:47 2011 +0000
- Commit message:
- GeekSessionLab talk.
Changed in this revision
diff -r 000000000000 -r 0946c896455e Libs/EthernetNetIf.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Libs/EthernetNetIf.lib Thu Oct 27 22:37:47 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/EthernetNetIf/#bc7df6da7589
diff -r 000000000000 -r 0946c896455e Libs/HTTPClient.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Libs/HTTPClient.lib Thu Oct 27 22:37:47 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/suupen/libraries/HTTPClient/lzcvoq \ No newline at end of file
diff -r 000000000000 -r 0946c896455e Libs/mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Libs/mbed.bld Thu Oct 27 22:37:47 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912
diff -r 000000000000 -r 0946c896455e main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Oct 27 22:37:47 2011 +0000
@@ -0,0 +1,106 @@
+//---------------------------------------------------------------------------------------------
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+//---------------------------------------------------------------------------------------------
+DigitalOut myled(LED1);
+Serial pc(USBTX, USBRX); // tx, rx
+//---------------------------------------------------------------------------------------------
+#define internaldebug // send debug messages to USB Serial port (9600,1,N)
+#define dhcpenable // auto-setup IP Address from DHCP router
+//---------------------------------------------------------------------------------------------
+// Ethernet Object Setup
+//---------------------------------------------------------------------------------------------
+#ifdef dhcpenable
+ EthernetNetIf eth;
+#else
+ EthernetNetIf eth(
+ IpAddr(192,168,1,100), //IP Address
+ IpAddr(255,255,255,0), //Network Mask
+ IpAddr(192,168,1,254), //Gateway
+ IpAddr(192,168,1,254) //DNS
+ );
+#endif
+//---------------------------------------------------------------------------------------------
+// HttpClient
+HTTPClient http;
+
+HTTPResult result;
+bool completed = false;
+void request_callback(HTTPResult r)
+{
+ result = r;
+ completed = true;
+}
+//---------------------------------------------------------------------------------------------
+// MAIN
+//---------------------------------------------------------------------------------------------
+int main()
+{
+ // Set Serial Port Transfer Rate
+ pc.baud(115200);
+
+ //--------------------------------------------------------
+ // Setting Ethernet
+ //--------------------------------------------------------
+ #ifdef internaldebug
+ printf("\r\nSetting up Ethernet interface!\r\n");
+ #endif
+ // Create return object for error check
+ EthernetErr ethErr = eth.setup();
+ if(ethErr)
+ {
+ #ifdef internaldebug
+ printf("\r\nError %d in Ethernet setup.\r\n", ethErr);
+ #endif
+ return -1;
+ }
+ #ifdef internaldebug
+ printf("\r\nEthernet setup completed with success!\r\n");
+ #endif
+ //--------------------------------------------------------
+
+ //--------------------------------------------------------
+ // HTTP Get Stream Request
+ //--------------------------------------------------------
+ HTTPStream stream;
+
+ char BigBuf[512 + 1] = {0};
+ stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
+
+ printf("\r\nHttpClient Get Stream Request ...\r\n");
+
+ HTTPResult r = http.get("http://services.sapo.pt/RSS/Feed/tek", &stream, request_callback); //Load a very large page, such as the hackaday RSS feed
+
+ while(!completed)
+ {
+ Net::poll(); //Polls the Networking stack
+ if(stream.readable())
+ {
+ BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
+ printf("%s\r\n",BigBuf); //Display it while loading
+ //Note: some servers do not like if you throttle them too much, so printf'ing during a request is generally bad practice
+ stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
+ }
+ }
+ printf("\n--------------\n");
+ if(result == HTTP_OK)
+ {
+ printf("Read completely\n");
+ }
+ else
+ {
+ printf("Error %d\n", result);
+ }
+ //--------------------------------------------------------
+
+ // main loop
+ while(1)
+ {
+ myled = 1;
+ wait(0.5);
+ myled = 0;
+ wait(0.5);
+ }
+}
+//---------------------------------------------------------------------------------------------
\ No newline at end of file