Index: /trunk/src/VBox/Runtime/testcase/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Runtime/testcase/Makefile.kmk	(revision 57955)
+++ /trunk/src/VBox/Runtime/testcase/Makefile.kmk	(revision 57956)
@@ -136,4 +136,5 @@
 	tstTimerLR \
 	tstRTTimeSpec \
+	tstRTUdp-1 \
 	tstUtf8 \
 	tstRTUuid \
@@ -629,4 +630,7 @@
 tstRTUuid_SOURCES = tstRTUuid.cpp
 
+tstRTUdp-1_TEMPLATE = VBOXR3TSTEXE
+tstRTUdp-1_SOURCES = tstRTUdp-1.cpp
+
 tstUtf8_TEMPLATE = VBOXR3TSTEXE
 tstUtf8_SOURCES = tstUtf8.cpp
Index: /trunk/src/VBox/Runtime/testcase/tstRTUdp-1.cpp
===================================================================
--- /trunk/src/VBox/Runtime/testcase/tstRTUdp-1.cpp	(revision 57956)
+++ /trunk/src/VBox/Runtime/testcase/tstRTUdp-1.cpp	(revision 57956)
@@ -0,0 +1,141 @@
+/* $Id$ */
+/** @file
+ * IPRT testcase - UDP.
+ */
+
+/*
+ * Copyright (C) 2015 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+#include <iprt/udp.h>
+
+#include <iprt/string.h>
+#include <iprt/test.h>
+
+#define RT_TEST_UDP_CLIENT_ADDRESS     "localhost"
+#define RT_TEST_UDP_CLIENT_PORT        52001
+
+/* Server address must be "localhost" */
+#define RT_TEST_UDP_LOCAL_HOST         "localhost"
+#define RT_TEST_UDP_SERVER_PORT        52000
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static RTTEST g_hTest;
+
+
+/* * * * * * * *   Test 1    * * * * * * * */
+
+static DECLCALLBACK(int) test1Server(RTSOCKET hSocket, void *pvUser)
+{
+    RTTestSetDefault(g_hTest, NULL);
+
+    char szBuf[512];
+    RTTESTI_CHECK_RET(pvUser == NULL, VERR_UDP_SERVER_STOP);
+
+    RTNETADDR ClientAddress;
+
+    /* wait for exclamation! */
+    size_t cbReallyRead;
+    RTTESTI_CHECK_RC_RET(RTSocketReadFrom(hSocket, szBuf, sizeof("dude!\n") - 1, &cbReallyRead, &ClientAddress), VINF_SUCCESS,
+                         VERR_UDP_SERVER_STOP);
+    szBuf[sizeof("dude!\n") - 1] = '\0';
+    RTTESTI_CHECK_RET(cbReallyRead == sizeof("dude!\n") - 1, VERR_UDP_SERVER_STOP);
+    RTTESTI_CHECK_RET(strcmp(szBuf, "dude!\n") == 0, VERR_UDP_SERVER_STOP);
+
+    /* say hello. */
+    RTTESTI_CHECK_RC_RET(RTSocketWriteTo(hSocket, "hello\n", sizeof("hello\n") - 1, &ClientAddress), VINF_SUCCESS,
+                         VERR_UDP_SERVER_STOP);
+
+    /* wait for goodbye. */
+    RTTESTI_CHECK_RC_RET(RTSocketReadFrom(hSocket, szBuf, sizeof("byebye\n") - 1, &cbReallyRead, &ClientAddress), VINF_SUCCESS,
+                         VERR_UDP_SERVER_STOP);
+    RTTESTI_CHECK_RET(cbReallyRead == sizeof("byebye\n") - 1, VERR_UDP_SERVER_STOP);
+    szBuf[sizeof("byebye\n") - 1] = '\0';
+    RTTESTI_CHECK_RET(strcmp(szBuf, "byebye\n") == 0, VERR_UDP_SERVER_STOP);
+
+    /* say buhbye */
+    RTTESTI_CHECK_RC_RET(RTSocketWriteTo(hSocket, "buh bye\n", sizeof("buh bye\n") - 1, &ClientAddress), VINF_SUCCESS,
+                         VERR_UDP_SERVER_STOP);
+
+    return VINF_SUCCESS;
+}
+
+
+static void test1()
+{
+    RTTestSub(g_hTest, "Simple server-client setup");
+
+    /*
+     * Set up server address (port) for UDP.
+     */
+    RTNETADDR ServerAddress;
+    RTTESTI_CHECK_RC_RETV(RTSocketParseInetAddress(RT_TEST_UDP_LOCAL_HOST, RT_TEST_UDP_SERVER_PORT, &ServerAddress),
+                          VINF_SUCCESS);
+
+    PRTUDPSERVER pServer;
+    RTTESTI_CHECK_RC_RETV(RTUdpServerCreate(RT_TEST_UDP_LOCAL_HOST, RT_TEST_UDP_SERVER_PORT, RTTHREADTYPE_DEFAULT, "server-1",
+                                            test1Server, NULL, &pServer), VINF_SUCCESS);
+
+    int rc;
+    RTSOCKET hSocket;
+    RTTESTI_CHECK_RC(rc = RTUdpCreateClientSocket(RT_TEST_UDP_CLIENT_ADDRESS, RT_TEST_UDP_CLIENT_PORT, &hSocket),
+                     VINF_SUCCESS);
+    if (RT_SUCCESS(rc))
+    {
+        do /* break non-loop */
+        {
+            char szBuf[512];
+            RT_ZERO(szBuf);
+            RTTESTI_CHECK_RC_BREAK(RTSocketWriteTo(hSocket, "dude!\n", sizeof("dude!\n") - 1, &ServerAddress), VINF_SUCCESS);
+
+            RTTESTI_CHECK_RC_BREAK(RTSocketRead(hSocket, szBuf, sizeof("hello\n") - 1, NULL), VINF_SUCCESS);
+            szBuf[sizeof("hello!\n") - 1] = '\0';
+            RTTESTI_CHECK_BREAK(strcmp(szBuf, "hello\n") == 0);
+
+            RTTESTI_CHECK_RC_BREAK(RTSocketWriteTo(hSocket, "byebye\n", sizeof("byebye\n") - 1, &ServerAddress), VINF_SUCCESS);
+            RT_ZERO(szBuf);
+            RTTESTI_CHECK_RC_BREAK(RTSocketRead(hSocket, szBuf, sizeof("buh bye\n") - 1, NULL), VINF_SUCCESS);
+            RTTESTI_CHECK_BREAK(strcmp(szBuf, "buh bye\n") == 0);
+        } while (0);
+
+        RTTESTI_CHECK_RC(RTSocketClose(hSocket), VINF_SUCCESS);
+    }
+
+    RTTESTI_CHECK_RC(RTUdpServerDestroy(pServer), VINF_SUCCESS);
+}
+
+
+int main()
+{
+    RTEXITCODE rcExit = RTTestInitAndCreate("tstRTUdp-1", &g_hTest);
+    if (rcExit != RTEXITCODE_SUCCESS)
+        return rcExit;
+    RTTestBanner(g_hTest);
+
+    test1();
+
+    /** @todo test the full RTUdp API. */
+
+    return RTTestSummaryAndDestroy(g_hTest);
+}
+