From 3788b08780975c2bd5a02a14ed437efd33695f34 Mon Sep 17 00:00:00 2001
From: Adam Dunkels <adam@thingsquare.com>
Date: Fri, 22 Nov 2013 15:10:44 +0100
Subject: [PATCH 1/2] Added a way to get the RSSI of the last received packet

---
 core/net/sicslowpan.c | 11 +++++++++++
 core/net/sicslowpan.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/core/net/sicslowpan.c b/core/net/sicslowpan.c
index 9fbc9baaa..7e0200418 100644
--- a/core/net/sicslowpan.c
+++ b/core/net/sicslowpan.c
@@ -257,6 +257,8 @@ static struct timer reass_timer;
 #define sicslowpan_len uip_len
 #endif /* SICSLOWPAN_CONF_FRAG */
 
+static int last_rssi;
+
 /*-------------------------------------------------------------------------*/
 /* Rime Sniffer support for one single listener to enable powertrace of IP */
 /*-------------------------------------------------------------------------*/
@@ -1604,6 +1606,9 @@ input(void)
   /* The MAC puts the 15.4 payload inside the RIME data buffer */
   rime_ptr = packetbuf_dataptr();
 
+  /* Save the RSSI of the incoming packet in case the upper layer will
+     want to query us for it later. */
+  last_rssi = (signed short)packetbuf_attr(PACKETBUF_ATTR_RSSI);
 #if SICSLOWPAN_CONF_FRAG
   /* if reassembly timed out, cancel it */
   if(timer_expired(&reass_timer)) {
@@ -1900,6 +1905,12 @@ sicslowpan_init(void)
 #endif /* SICSLOWPAN_COMPRESSION == SICSLOWPAN_COMPRESSION_HC06 */
 }
 /*--------------------------------------------------------------------*/
+int
+sicslowpan_get_last_rssi(void)
+{
+  return last_rssi;
+}
+/*--------------------------------------------------------------------*/
 const struct network_driver sicslowpan_driver = {
   "sicslowpan",
   sicslowpan_init,
diff --git a/core/net/sicslowpan.h b/core/net/sicslowpan.h
index f4a3bc562..4f12e9fe4 100644
--- a/core/net/sicslowpan.h
+++ b/core/net/sicslowpan.h
@@ -317,6 +317,7 @@ struct sicslowpan_nh_compressor {
 
 };
 
+int sicslowpan_get_last_rssi(void);
 
 extern const struct network_driver sicslowpan_driver;
 

From b31e84649a3139f546f9b5148d886d3a07a63d7e Mon Sep 17 00:00:00 2001
From: Adam Dunkels <adam@thingsquare.com>
Date: Fri, 22 Nov 2013 15:12:02 +0100
Subject: [PATCH 2/2] If the 6lowpan layer is currently reassembling a packet,
 and a non-fragmented packet comes along, this is a sign that one of the
 fragments were lost (as they normally would arrive back-to-back, in
 sequence). So we'll grab the non-fragmented packet instead of dropping it.

---
 core/net/sicslowpan.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/net/sicslowpan.c b/core/net/sicslowpan.c
index 7e0200418..844064cae 100644
--- a/core/net/sicslowpan.c
+++ b/core/net/sicslowpan.c
@@ -1671,7 +1671,12 @@ input(void)
    */
 #define PRIORITIZE_NEW_PACKETS 1
 #if PRIORITIZE_NEW_PACKETS
-  if(processed_ip_in_len > 0 && first_fragment
+
+  if(!is_fragment) {
+    /* Prioritize non-fragment packets too. */
+    sicslowpan_len = 0;
+    processed_ip_in_len = 0;
+  } else if(processed_ip_in_len > 0 && first_fragment
       && !rimeaddr_cmp(&frag_sender, packetbuf_addr(PACKETBUF_ADDR_SENDER))) {
     sicslowpan_len = 0;
     processed_ip_in_len = 0;