From 444922ea93378aedc200c5a998d39fa4118d8b71 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Tue, 8 Aug 2017 08:16:47 -0600
Subject: [PATCH] apps/examples/udp:  Enable testing with the broadcast
 address.

---
 examples/udp/Kconfig      |  7 +++++++
 examples/udp/udp_client.c | 14 ++++++++++++++
 examples/udp/udp_server.c | 13 +++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/examples/udp/Kconfig b/examples/udp/Kconfig
index ba81ca0de..0d6b65a63 100644
--- a/examples/udp/Kconfig
+++ b/examples/udp/Kconfig
@@ -101,6 +101,13 @@ config EXAMPLES_UDP_IPv6
 
 endchoice # IP Domain
 
+config EXAMPLES_UDP_BROADCAST
+	bool "Broadcast outgoing messages"
+	default n
+	depends on NET_BROADCAST
+	---help---
+		Send and receive all UDP packets using the broadcast address.
+
 if EXAMPLES_UDP_IPv4
 
 comment "IPv4 addresses"
diff --git a/examples/udp/udp_client.c b/examples/udp/udp_client.c
index 6387963b7..3aabcbd2e 100644
--- a/examples/udp/udp_client.c
+++ b/examples/udp/udp_client.c
@@ -142,6 +142,10 @@ void udp_client(void)
   int sockfd;
   int nbytes;
   int offset;
+#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
+  int optval;
+  int ret;
+#endif
 
   /* Create a new UDP socket */
 
@@ -152,6 +156,16 @@ void udp_client(void)
       exit(1);
     }
 
+#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
+  optval = 1;
+  ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(int));
+  if (ret < 0)
+    {
+      printf("Failed to set SO_BROADCAST\n");
+      exit(1);
+    }
+#endif
+
   /* Then send and receive 256 messages */
 
   for (offset = 0; offset < 256; offset++)
diff --git a/examples/udp/udp_server.c b/examples/udp/udp_server.c
index 08de11a76..18f29b6a2 100644
--- a/examples/udp/udp_server.c
+++ b/examples/udp/udp_server.c
@@ -101,6 +101,9 @@ void udp_server(void)
   int nbytes;
   int optval;
   int offset;
+#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
+  int ret;
+#endif
 
   /* Create a new UDP socket */
 
@@ -120,6 +123,16 @@ void udp_server(void)
       exit(1);
     }
 
+#ifdef CONFIG_EXAMPLES_UDP_BROADCAST
+  optval = 1;
+  ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(int));
+  if (ret < 0)
+    {
+      printf("Failed to set SO_BROADCAST\n");
+      exit(1);
+    }
+#endif
+
   /* Bind the socket to a local address */
 
 #ifdef CONFIG_EXAMPLES_UDP_IPv6