diff --git a/examples/sky/sky-treeroute.c b/examples/sky/sky-treeroute.c
new file mode 100644
index 000000000..0c46d21c9
--- /dev/null
+++ b/examples/sky/sky-treeroute.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: sky-treeroute.c,v 1.1 2007/03/27 10:39:30 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A brief description of what this file is.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#include "contiki.h"
+#include "net/rime.h"
+#include "net/rime/tree.h"
+#include "dev/leds.h"
+#include "dev/button-sensor.h"
+
+#include "dev/light.h"
+#include <stdio.h>
+
+static struct tree_conn tc;
+
+/*---------------------------------------------------------------------------*/
+PROCESS(test_tree_process, "Test tree process");
+PROCESS(depth_blink_process, "Depth indicator");
+AUTOSTART_PROCESSES(&test_tree_process, &depth_blink_process);
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(depth_blink_process, ev, data)
+{
+  static struct etimer et;
+  static int count;
+
+  PROCESS_BEGIN();
+
+  while(1) {
+    etimer_set(&et, CLOCK_SECOND * 1);
+    PROCESS_WAIT_UNTIL(etimer_expired(&et));
+    count = tree_depth(&tc);
+    if(count == TREE_MAX_DEPTH) {
+      leds_on(LEDS_RED);
+    } else {
+      leds_off(LEDS_RED);
+      while(count > 0) {
+	leds_on(LEDS_RED);
+	etimer_set(&et, CLOCK_SECOND / 10);
+	PROCESS_WAIT_UNTIL(etimer_expired(&et));
+	leds_off(LEDS_RED);
+	etimer_set(&et, CLOCK_SECOND / 10);
+	PROCESS_WAIT_UNTIL(etimer_expired(&et));
+	--count;
+      }
+    }
+  }
+  
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+static void
+recv(rimeaddr_t *originator, u8_t seqno, u8_t hops, u8_t retransmissions)
+{
+  rimebuf_hdrreduce(8);
+  printf("Got message from %d.%d, seqno %d, hops %d, retransmissions %d: len %d '%s'\n",
+	 originator->u8[0], originator->u8[1],
+	 seqno, hops, retransmissions,
+	 rimebuf_datalen(),
+	 (char *)rimebuf_dataptr());
+}
+/*---------------------------------------------------------------------------*/
+static const struct tree_callbacks callbacks = { recv };
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(test_tree_process, ev, data)
+{
+  PROCESS_EXITHANDLER(goto exit;)
+  PROCESS_BEGIN();
+
+  button_sensor.activate();
+  
+  tree_open(&tc, 128, &callbacks);
+  
+  while(1) {
+    static struct etimer et;
+
+    etimer_set(&et, CLOCK_SECOND * 8);
+    
+    PROCESS_WAIT_EVENT();
+    
+    if(ev == sensors_event) {
+      if(data == &button_sensor) {
+	printf("Button\n");
+	tree_set_sink(&tc, 1);
+      }
+    }
+
+    if(etimer_expired(&et)) {
+      rimebuf_clear();
+      rimebuf_set_datalen(sprintf(rimebuf_dataptr(), "%d %d",
+				  sensors_light1(), sensors_light2()));
+      printf("Sending '%s'\n", rimebuf_dataptr());
+      tree_send(&tc);
+    }
+    
+  }
+ exit:
+  tree_close(&tc);
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/