Forgot to add a file in the last commit

examples/nxhello/nxhello_listener.c

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+/****************************************************************************
+ * examples/nxterm/nxhello_listener.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <nuttx/nx/nx.h>
+
+#include "nxhello.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxhello_listener
+ ****************************************************************************/
+
+FAR void *nxhello_listener(FAR void *arg)
+{
+  int ret;
+
+  /* Process events forever */
+
+  for (;;)
+    {
+      /* Handle the next event.  If we were configured blocking, then
+       * we will stay right here until the next event is received.  Since
+       * we have dedicated a while thread to servicing events, it would
+       * be most natural to also select CONFIG_NX_BLOCKING -- if not, the
+       * following would be a tight infinite loop (unless we added addition
+       * logic with nx_eventnotify and sigwait to pace it).
+       */
+
+      ret = nx_eventhandler(g_nxhello.hnx);
+      if (ret < 0)
+        {
+          /* An error occurred... assume that we have lost connection with
+           * the server.
+           */
+
+          printf("nxhello_listener: Lost server connection: %d\n", errno);
+          exit(EXIT_FAILURE);
+        }
+
+      /* If we received a message, we must be connected */
+
+      if (!g_nxhello.connected)
+        {
+          g_nxhello.connected = true;
+          sem_post(&g_nxhello.eventsem);
+          printf("nxhello_listener: Connected\n");
+        }
+    }
+}