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diff --git a/nuttx/net/uip/uip_igmptimer.c b/nuttx/net/uip/uip_igmptimer.c
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+/****************************************************************************
+ * net/uip/uip_igmpleave.c
+ *
+ *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * The NuttX implementation of IGMP was inspired by the IGMP add-on for the
+ * lwIP TCP/IP stack by Steve Reynolds:
+ *
+ *   Copyright (c) 2002 CITEL Technologies Ltd.
+ *   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 CITEL Technologies Ltd 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 CITEL TECHNOLOGIES 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 CITEL TECHNOLOGIES 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. 
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <wdog.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <net/uip/uipopt.h>
+#include <net/uip/uip.h>
+#include <net/uip/uip-igmp.h>
+
+#include "uip_internal.h"
+
+#ifdef CONFIG_NET_IGMP
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  uip_igmptimeout
+ *
+ * Description:
+ *   Timeout watchdog handler.
+ *
+ * Assumptions:
+ *   This function is called from the wdog timer handler which runs in the
+ *   context of the timer interrupt handler.
+ *
+ ****************************************************************************/
+
+static void uip_igmptimeout(int argc, uint32_t arg, ...)
+{
+  FAR struct igmp_group_s *group;
+
+  /* If the state is DELAYING_MEMBER then we send a report for this group */
+
+  nvdbg("Timeout!\n");
+  group = (FAR struct igmp_group_s *)arg;
+  DEBUGASSERT(argc == 1 && group);
+
+  /* If the group exists and is no an IDLE MEMBER, then it must be a DELAYING
+   * member.  Race conditions are avoided because (1) the timer is not started
+   * until after the first IGMPv2_MEMBERSHIP_REPORT during the join, and (2)
+   * the timer is canceled before sending the IGMP_LEAVE_GROUP during a leave.
+   */
+
+  if (!IS_IDLEMEMBER(group->flags))
+    {
+      /* Schedule (and forget) the Membership Report.  NOTE:
+       * Since we are executing from a timer interrupt, we cannot wait
+       * for the message to be sent.
+       */
+
+      IGMP_STATINCR(uip_stat.igmp.report_sched);
+      uip_igmpschedmsg(group, IGMPv2_MEMBERSHIP_REPORT);
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  uip_igmpstarttimer
+ *
+ * Description:
+ *   Start the IGMP timer.
+ *
+ * Assumptions:
+ *   This function may be called from most any context.
+ *
+ ****************************************************************************/
+
+int uip_decisec2tick(int decisecs)
+{
+  /* Convert the deci-second comparison value to clock ticks.  The CLK_TCK
+   * value is the number of clock ticks per second; decisecs argument is the
+   * maximum delay in 100's of milliseconds.  CLK_TCK/10 is then the number
+   * of clock ticks in 100 milliseconds.
+   */
+
+  return CLK_TCK * decisecs / 10;
+	
+}
+/****************************************************************************
+ * Name:  uip_igmpstartticks and uip_igmpstarttimer
+ *
+ * Description:
+ *   Start the IGMP timer with differing time units (ticks or deciseconds).
+ *
+ * Assumptions:
+ *   This function may be called from most any context.
+ *
+ ****************************************************************************/
+
+void uip_igmpstartticks(FAR struct igmp_group_s *group, int ticks)
+{
+  /* Start the timer */
+
+  wd_start(group->wdog, ticks, uip_igmptimeout, 1, (uint32_t)group);
+}
+
+void uip_igmpstarttimer(FAR struct igmp_group_s *group, uint8_t decisecs)
+{
+  /* Convert the decisec value to system clock ticks and start the timer.
+   * Important!! this should be a random timer from 0 to decisecs
+   */
+  
+  uip_igmpstartticks(group, uip_decisec2tick(decisecs));
+}
+
+/****************************************************************************
+ * Name:  uip_igmpcmptimer
+ *
+ * Description:
+ *   Compare the timer remaining on the watching timer to the deci-second
+ *   value. If maxticks > ticks-remaining, then (1) cancel the timer (to
+ *   avoid race conditions) and return true.
+ *
+ * Assumptions:
+ *   This function may be called from most any context.  If true is retuend
+ *   then the caller must call uip_igmpstartticks() to restart the timer
+ *
+ ****************************************************************************/
+
+bool uip_igmpcmptimer(FAR struct igmp_group_s *group, int maxticks)
+{
+  irqstate_t flags;
+  int remaining;
+
+  /* Disable interrupts so that there is no race condition with the actual
+   * timer expiration.
+   */
+
+  flags = irqsave();
+
+  /* Get the timer remaining on the watchdog.  A time of <= zero means that
+   * the watchdog was never started.
+   */
+
+  remaining = wd_gettime(group->wdog);
+
+  /* A remaining time of zero means that the watchdog was never started
+   * or has already expired.  That case should be covered in the following
+   * test as well.
+   */
+
+  if (maxticks > remaining)
+    {
+      /* Cancel the watchdog timer and return true */
+
+      wd_cancel(group->wdog);
+      irqrestore(flags);
+      return true;
+    }
+
+  irqrestore(flags);
+  return false;
+}
+
+#endif /* CONFIG_NET_IGMP */