Diff: findbuddy.cpp

Revision:

39:108499af2b53

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/findbuddy.cpp	Wed Jun 06 03:34:16 2012 +0000
@@ -0,0 +1,38 @@
+#include "EthernetNetIf.h"
+#include "SimpleSocket.h"
+
+void findbuddy() {
+    EthernetNetIf eth;
+    eth.setup();
+   
+    IpAddr myIP = eth.getIp();
+    DatagramSocket datagram(myIP, 7777);
+
+    Host buddy;
+    for (int i = myIP[3] + 1;; i = (i - myIP[3] + 260) % 10 + myIP[3] + 1) {
+        printf("sending message to %d.%d.%d.%d\n", myIP[0], myIP[1], myIP[2], i);
+        datagram.printf("Hello World\n");
+        datagram.send(IpAddr(myIP[0], myIP[1], myIP[2], i), 7777);
+        // this will not reach target during the first round,
+        // and in order to receive successfully,
+        // timeout must be at least 4 seconds (default = 5.0 seconds)
+        if (datagram.receive(&buddy, 4) > 0) {
+            IpAddr ip = buddy.getIp();
+            char buf[80] = {};
+            int len = datagram.read(buf, sizeof(buf) - 1);
+            printf("received from %d.%d.%d.%d: %s", ip[0],ip[1], ip[2], ip[3], buf);
+            break;
+        }
+    }
+
+    for (int i = 0; i < 2; i++) {
+        datagram.printf("There you are!\n");
+        datagram.send(buddy.getIp(), 7777);
+
+        if (datagram.receive() > 0) {
+            char buf[80] = {};
+            int len = datagram.read(buf, sizeof(buf) - 1);
+            printf("received: %s", buf);
+        }
+    }
+}
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