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diff --git a/nuttx/net/uip/uip-poll.c b/nuttx/net/uip/uip-poll.c
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+++ b/nuttx/net/uip/uip-poll.c
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+/****************************************************************************
+ * net/uip/uip-poll.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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>
+#ifdef CONFIG_NET
+
+#include <sys/types.h>
+#include <debug.h>
+
+#include <net/uip/uipopt.h>
+#include <net/uip/uip.h>
+#include <net/uip/uip-arch.h>
+
+#include "uip-internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uip_udppoll()
+ *
+ * Description:
+ *   Periodic processing for a UDP connection identified by its number.
+ *   This function does the necessary periodic processing (timers,
+ *   polling) for a uIP TCP conneciton, and should be called by the UIP
+ *   device driver when the periodic uIP timer goes off. It should be
+ *   called for every connection, regardless of whether they are open of
+ *   closed.
+ *
+ * Assumptions:
+ *   This function is called from the CAN device driver may be called from
+ *   the timer interrupt/watchdog handle level.
+ *
+ ****************************************************************************/
+
+static inline void uip_udppoll(struct uip_driver_s *dev, unsigned int conn)
+{
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: uip-poll
+ *
+ * Description:
+ *   This function will traverse each active uIP connection structure and
+ *   perform uip_interrupt with the specified event.  After each polling each
+ *   active uIP connection structure, this function will call the provided
+ *   callback function if the poll resulted in new data to be send.  The poll
+ *   will continue until all connections have been polled or until the user-
+ *   suplied function returns a non-zero value (which is would do only if
+ *   it cannot accept further write data).
+ *
+ *   This function should be called periodically with event == UIP_TIMER for
+ *   periodic processing.  This function may also be called with UIP_POLL to
+ *   perform necessary periodic processing of TCP connections.
+ *
+ *   When the callback function is called, there may be an outbound packet
+ *   waiting for service in the uIP packet buffer, and if so the d_len field
+ *   is set to a value larger than zero. The device driver should be called to
+ *   send out the packet.
+ *
+ * Assumptions:
+ *   This function is called from the CAN device driver and may be called from
+ *   the timer interrupt/watchdog handle level.
+ *
+ ****************************************************************************/
+
+int uip_poll(struct uip_driver_s *dev, uip_poll_callback_t callback, int event)
+{
+  struct uip_conn *conn;
+#ifdef CONFIG_NET_UDP
+  struct uip_udp_conn *udp_conn;
+#endif
+  irqstate_t flags;
+
+  /* Interrupts must be disabled while traversing the active connection list */
+
+  flags = irqsave();
+
+  /* Traverse all of the active TCP connections and perform the poll action */
+
+  conn = NULL;
+  while ((conn = uip_nexttcpconn(uip_conn)))
+    {
+      uip_conn = conn;
+      uip_interrupt(dev, event);
+      if (callback(dev))
+        {
+          irqrestore(flags);
+          return 1;
+        }
+    }
+  uip_conn = NULL;
+
+#ifdef CONFIG_NET_UDP
+  /* Traverse all of the allocated UDP connections and perform a poll action */
+
+  udp_conn = NULL;
+  while ((udp_conn = uip_nextudpconn(uip_udp_conn)))
+    {
+      uip_udp_conn = udp_conn;
+      uip_interrupt(dev, UIP_UDP_POLL);
+      if (callback(dev))
+        {
+          irqrestore(flags);
+          return 1;
+        }
+    }
+  uip_udp_conn = NULL;
+#endif /* CONFIG_NET_UDP */
+
+  irqrestore(flags);
+  return 0;
+}
+
+#endif /* CONFIG_NET */