Wi-sun dublicate MPX ID filter support

LLC layer will drop id it hear same ID again in 5sec period.

Change-Id: Idc86736d95b8298318144aebf61f77383ee85b2f

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_llc_data_service.c

@@ -526,6 +526,8 @@ static void ws_llc_mac_indication_cb(const mac_api_t *api, const mcps_data_ind_t
             tr_debug("Drop message no neighbor");
             return;
         }
+        //Storage Time from Last Unicast rx time stamp
+        uint32_t time_from_last = data->timestamp - neighbor_info.ws_neighbor->fhss_data.uc_timing_info.utt_rx_timestamp;
 
         ws_neighbor_class_neighbor_unicast_time_info_update(neighbor_info.ws_neighbor, &ws_utt, data->timestamp);
         if (us_ie_inline) {
@@ -570,6 +572,19 @@ static void ws_llc_mac_indication_cb(const mac_api_t *api, const mcps_data_ind_t
             }
         }
 
+        //MPX Duplicate Address Detection
+        if (neighbor_info.ws_neighbor->mpx_stored) {
+
+            if (time_from_last < 5000000 && neighbor_info.ws_neighbor->mpx_id == mpx_frame.transaction_id) {
+                tr_debug("Drop message: Dublicate mpx id in short time");
+                return;
+            }
+        } else {
+            neighbor_info.ws_neighbor->mpx_stored = true;
+        }
+        //Store MPX
+        neighbor_info.ws_neighbor->mpx_id = mpx_frame.transaction_id;
+
         // Discover MPX
         mpx_user_t *user_cb = ws_llc_mpx_user_discover(&base->mpx_data_base, mpx_frame.multiplex_id);
         if (user_cb && user_cb->data_ind) {

source/6LoWPAN/ws/ws_neighbor_class.h

@@ -28,6 +28,8 @@ typedef struct ws_neighbor_class_entry {
     uint16_t rsl_in;                                       /*!< RSL EWMA heard from neighbour*/
     uint16_t rsl_out;                                      /*!< RSL EWMA heard by neighbour*/
     uint16_t routing_cost;                                 /*!< ETX to border Router. */
+    unsigned mpx_id: 5;
+    bool mpx_stored: 1;
     bool candidate_parent: 1;
     bool broadcast_timing_info_stored: 1;
     bool broadcast_shedule_info_stored: 1;