Diff: examples/findbuddy.cpp

Revision:

0:6dc3cfd058c6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/findbuddy.cpp	Mon Feb 04 09:29:18 2013 +0000
@@ -0,0 +1,40 @@
+#include "SimpleSocket.h"
+
+void findbuddy()
+{
+    int myIP[4];
+    sscanf(EthernetInterface::getIPAddress(), "%d.%d.%d.%d", myIP, myIP + 1, myIP + 2, myIP + 3);
+
+    DatagramSocket datagram(7777);
+
+    char buddy[32] = {};
+    int port;
+    for (int i = myIP[3] + 1;; i = (i - myIP[3] + 260) % 10 + myIP[3] + 1) {
+        sprintf(buddy, "%d.%d.%d.%d", myIP[0], myIP[1], myIP[2], i);
+        printf("sending message to %s\n", buddy);
+        datagram.printf("Hello World\n");
+
+        datagram.send(buddy, 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)
+        datagram.setTimeout(4.0);
+        if (datagram.receive(buddy, &port) > 0) {
+            char buf[80] = {};
+            int len = datagram.read(buf, sizeof(buf) - 1);
+            printf("received from %s: %s", buddy, buf);
+            break;
+        }
+    }
+
+    for (int i = 0; i < 2; i++) {
+        datagram.printf("There you are!\n");
+        datagram.send(buddy, 7777);
+
+        if (datagram.receive() > 0) {
+            char buf[80] = {};
+            int len = datagram.read(buf, sizeof(buf) - 1);
+            printf("received: %s", buf);
+        }
+    }
+}
\ No newline at end of file