Wi-sun dublicate MPX ID filter support

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

Change-Id: Idc86736d95b8298318144aebf61f77383ee85b2f

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;