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diff --git a/nuttx/net/uip/uip_udpinput.c b/nuttx/net/uip/uip_udpinput.c
new file mode 100644
index 000000000..b9003cd86
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+++ b/nuttx/net/uip/uip_udpinput.c
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+/****************************************************************************
+ * net/uip/uip_udpinput.c
+ * Handling incoming UDP input
+ *
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Adapted for NuttX from logic in uIP which also has a BSD-like license:
+ *
+ *   Original author Adam Dunkels <adam@dunkels.com>
+ *   Copyright () 2001-2003, Adam Dunkels.
+ *   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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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>
+#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP)
+
+#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"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define UDPBUF ((struct uip_udpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uip_udpinput
+ *
+ * Description:
+ *   Handle incoming UDP input
+ *
+ * Parameters:
+ *   dev - The device driver structure containing the received UDP packet
+ *
+ * Return:
+ *   None
+ *
+ * Assumptions:
+ *   Called from the interrupt level or with interrupts disabled.
+ *
+ ****************************************************************************/
+
+void uip_udpinput(struct uip_driver_s *dev)
+{
+  struct uip_udp_conn *conn;
+
+  /* UDP processing is really just a hack. We don't do anything to the UDP/IP
+   * headers, but let the UDP application do all the hard work. If the
+   * application sets d_sndlen, it has a packet to send.
+   */
+
+  dev->d_len    -= UIP_IPUDPH_LEN;
+#ifdef CONFIG_NET_UDP_CHECKSUMS
+  dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+  if (UDPBUF->udpchksum != 0 && uip_udpchksum(dev) != 0xffff)
+    {
+#ifdef CONFIG_NET_STATISTICS
+      uip_stat.udp.drop++;
+      uip_stat.udp.chkerr++;
+#endif
+      ndbg("Bad UDP checksum\n");
+      dev->d_len = 0;
+    }
+  else
+#endif
+    {
+      /* Demultiplex this UDP packet between the UDP "connections". */
+
+      conn = uip_udpactive(UDPBUF);
+      if (conn)
+        {
+          /* Setup for the application callback */
+
+          dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+          dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
+          dev->d_sndlen  = 0;
+
+          /* Perform the application callback */
+
+          uip_udpcallback(dev, conn, UIP_NEWDATA);
+
+          /* If the application has data to send, setup the UDP/IP header */
+
+          if (dev->d_sndlen > 0)
+            {
+              uip_udpsend(dev, conn);
+            }
+        }
+      else
+        {
+          ndbg("No listener on UDP port\n");
+          dev->d_len = 0;
+        }
+    }
+
+  return;
+}
+
+#endif /* CONFIG_NET && CONFIG_NET_UDP */