Squashed 'tmk_core/' changes from 7967731..b9e0ea0

b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk'
7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5

git-subtree-dir: tmk_core
git-subtree-split: b9e0ea08cb940de20b3610ecdda18e9d8cd7c552

tool/mbed/mbed-sdk/libraries/tests/net/echo/udp_server/main.cpp

@@ -0,0 +1,37 @@
+#include "mbed.h"
+#include "test_env.h"
+#include "EthernetInterface.h"
+
+namespace {
+    const int ECHO_SERVER_PORT = 7;
+    const int BUFFER_SIZE = 64;
+}
+
+int main (void) {
+    MBED_HOSTTEST_TIMEOUT(20);
+    MBED_HOSTTEST_SELECT(udpecho_server_auto);
+    MBED_HOSTTEST_DESCRIPTION(UDP echo server);
+    MBED_HOSTTEST_START("NET_5");
+
+    EthernetInterface eth;
+    eth.init(); //Use DHCP
+    eth.connect();
+    printf("MBED: Server IP Address is %s:%d\r\n", eth.getIPAddress(), ECHO_SERVER_PORT);
+
+    UDPSocket server;
+    server.bind(ECHO_SERVER_PORT);
+
+    Endpoint client;
+    char buffer[BUFFER_SIZE] = {0};
+    printf("MBED: Waiting for packet...\r\n");
+    while (true) {
+        int n = server.receiveFrom(client, buffer, sizeof(buffer));
+        if (n > 0) {
+            //printf("Received packet from: %s\n", client.get_address());
+            const int buffer_string_end_index = n >= BUFFER_SIZE ? BUFFER_SIZE-1 : n;
+            buffer[buffer_string_end_index] = '\0';
+            //printf("Server received: %s\n", buffer);
+            server.sendTo(client, buffer, n);
+        }
+    }
+}