diff --git a/core/net/rime/Makefile.rime b/core/net/rime/Makefile.rime
index 8eb6f3311..4bdd9f112 100644
--- a/core/net/rime/Makefile.rime
+++ b/core/net/rime/Makefile.rime
@@ -1,5 +1,5 @@
 CONTIKI_SOURCEFILES += rimebuf.c queuebuf.c rimeaddr.c ctimer.c rime.c \
-               ibc.c uc.c suc.c ruc.c sibc.c sabc.c abc.c nf.c \
+               ibc.c uc.c suc.c ruc.c sibc.c sabc.c abc.c nf.c uabc.c \
                mesh.c route.c \
                tree.c neighbor.c \
                trickle.c
diff --git a/core/net/rime/uabc.c b/core/net/rime/uabc.c
new file mode 100644
index 000000000..e9b061572
--- /dev/null
+++ b/core/net/rime/uabc.c
@@ -0,0 +1,118 @@
+/*
+ * 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: uabc.c,v 1.1 2007/03/20 11:59:55 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         Unique Anonymous best effort local area BroadCast (uabc)
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#include "net/rime.h"
+#include "net/rime/uabc.h"
+#include "lib/rand.h"
+
+#include <string.h>
+
+/*---------------------------------------------------------------------------*/
+static void
+recv(struct abc_conn *abc)
+{
+  struct uabc_conn *c = (struct uabc_conn *)abc;
+  if(c->q != NULL &&
+     rimebuf_datalen() == queuebuf_datalen(c->q) &&
+     memcmp(rimebuf_dataptr(), queuebuf_dataptr(c->q),
+	    rimebuf_datalen()) == 0) {
+    /* We received a copy of our own packet, so we do not send out
+       packet. */
+    queuebuf_free(c->q);
+    ctimer_stop(&c->t);
+    if(c->cb->dropped) {
+      c->cb->dropped(c);
+    }
+  }
+  if(c->cb->recv) {
+    c->cb->recv(c);
+  }
+}
+/*---------------------------------------------------------------------------*/
+static void
+send(void *ptr)
+{
+  struct uabc_conn *c = ptr;
+
+  if(c->q != NULL) {
+    queuebuf_to_rimebuf(c->q);
+    queuebuf_free(c->q);
+    abc_send(&c->c);
+    if(c->cb->sent) {
+	c->cb->sent(c);
+    }
+  }
+}
+/*---------------------------------------------------------------------------*/
+static const struct abc_callbacks abc = { recv };
+/*---------------------------------------------------------------------------*/
+void
+uabc_open(struct uabc_conn *c, u16_t channel,
+	  const struct uabc_callbacks *cb)
+{
+  abc_open(&c->c, channel, &abc);
+  c->cb = cb;
+}
+/*---------------------------------------------------------------------------*/
+void
+uabc_close(struct uabc_conn *c)
+{
+  abc_close(&c->c);
+  ctimer_stop(&c->t);
+  if(c->q != NULL) {
+    queuebuf_free(c->q);
+  }
+}
+/*---------------------------------------------------------------------------*/
+int
+uabc_send(struct uabc_conn *c, clock_time_t interval)
+{
+  if(c->q != NULL) {
+    /* If we are already about to send a packet, we cancel the old one. */
+    queuebuf_free(c->q);
+  }
+  c->q = queuebuf_new_from_rimebuf();
+  if(c->q != NULL) {
+    ctimer_set(&c->t, rand() % interval, send, c);
+    return 1;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
diff --git a/core/net/rime/uabc.h b/core/net/rime/uabc.h
new file mode 100644
index 000000000..6285a4703
--- /dev/null
+++ b/core/net/rime/uabc.h
@@ -0,0 +1,82 @@
+/**
+ * \addtogroup rime
+ * @{
+ */
+
+/**
+ * \defgroup uabc Unique Anonymous best effort local area BroadCast
+ * @{
+ *
+ * Send one packet that is unique within a time interval.
+ *
+ */
+
+/*
+ * 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: uabc.h,v 1.1 2007/03/20 11:59:55 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         Header file for Unique Anonymous best effort local area BroadCast (uabc)
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __UABC_H__
+#define __UABC_H__
+
+#include "net/rime.h"
+
+struct uabc_conn;
+
+struct uabc_callbacks {
+  void (* recv)(struct uabc_conn *c);
+  void (* sent)(struct uabc_conn *c);
+  void (* dropped)(struct uabc_conn *c);
+};
+
+struct uabc_conn {
+  struct abc_conn c;
+  const struct uabc_callbacks *cb;
+  struct ctimer t;
+  struct queuebuf *q;
+};
+
+void uabc_open(struct uabc_conn *c, u16_t channel,
+	       const struct uabc_callbacks *cb);
+void uabc_close(struct uabc_conn *c);
+int  uabc_send(struct uabc_conn *c, clock_time_t interval);
+
+#endif /* __UABC_H__ */
+
+/** @} */
+/** @} */