From d4f58ca7f07f4a984a05e372e14f688b1fc03c17 Mon Sep 17 00:00:00 2001
From: dak664 <dak664@embarqmail.com>
Date: Tue, 8 Mar 2011 14:15:55 -0500
Subject: [PATCH] Server address options giving different 6lowpan header
 compression

---
 examples/ipv6/rpl-udp/udp-client.c | 24 +++++++++++++++++++++---
 examples/ipv6/rpl-udp/udp-server.c | 23 +++++++++++++++++++++--
 2 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/examples/ipv6/rpl-udp/udp-client.c b/examples/ipv6/rpl-udp/udp-client.c
index f539b41aa..c7c425c7b 100644
--- a/examples/ipv6/rpl-udp/udp-client.c
+++ b/examples/ipv6/rpl-udp/udp-client.c
@@ -114,9 +114,27 @@ set_global_address(void)
   uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
   uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
 
-  /* set server address */
-  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
-
+/* The choice of server address determines its 6LoPAN header compression.
+ * (Our address will be compressed Mode 3 since it is derived from our link-local address)
+ * Obviously the choice made here must also be selected in udp-server.c.
+ *
+ * For correct Wireshark decoding using a sniffer, add the /64 prefix to the 6LowPAN protocol preferences,
+ * e.g. set Context 0 to aaaa::.  At present Wireshark copies Context/128 and then overwrites it.
+ * (Setting Context 0 to aaaa::1111:2222:3333:4444 will report a 16 bit compressed address of aaaa::1111:22ff:fe33:xxxx)
+ *
+ * Note the IPCMV6 checksum verification depends on the correct uncompressed addresses.
+ */
+ 
+#if 0
+/* Mode 1 - 64 bits inline */
+   uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+#elif 1
+/* Mode 2 - 16 bits inline */
+  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
+#else
+/* Mode 3 - derived from server link-local (MAC) address */
+  uip_ip6addr(&server_ipaddr, 0xaaaa, 0, 0, 0, 0x0250, 0xc2ff, 0xfea8, 0xcd1a); //redbee-econotag
+#endif
 }
 /*---------------------------------------------------------------------------*/
 PROCESS_THREAD(udp_client_process, ev, data)
diff --git a/examples/ipv6/rpl-udp/udp-server.c b/examples/ipv6/rpl-udp/udp-server.c
index e9e98d346..0a5f83e93 100644
--- a/examples/ipv6/rpl-udp/udp-server.c
+++ b/examples/ipv6/rpl-udp/udp-server.c
@@ -108,8 +108,27 @@ PROCESS_THREAD(udp_server_process, ev, data)
   PRINTF("UDP server started\n");
 
 #if UIP_CONF_ROUTER
-  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
-  /* uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr); */
+/* The choice of server address determines its 6LoPAN header compression.
+ * Obviously the choice made here must also be selected in udp-client.c.
+ *
+ * For correct Wireshark decoding using a sniffer, add the /64 prefix to the 6LowPAN protocol preferences,
+ * e.g. set Context 0 to aaaa::.  At present Wireshark copies Context/128 and then overwrites it.
+ * (Setting Context 0 to aaaa::1111:2222:3333:4444 will report a 16 bit compressed address of aaaa::1111:22ff:fe33:xxxx)
+ * Note Wireshark's IPCMV6 checksum verification depends on the correct uncompressed addresses.
+ */
+ 
+#if 0
+/* Mode 1 - 64 bits inline */
+   uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 1);
+#elif 1
+/* Mode 2 - 16 bits inline */
+  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0x00ff, 0xfe00, 1);
+#else
+/* Mode 3 - derived from link local (MAC) address */
+  uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
+  uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
+#endif
+
   uip_ds6_addr_add(&ipaddr, 0, ADDR_MANUAL);
   root_if = uip_ds6_addr_lookup(&ipaddr);
   if(root_if != NULL) {