fix for sleepy node poll. (ARMmbed#1750)

Author: deepakvenugopal

source/6LoWPAN/MAC/mac_data_poll.c

@@ -285,15 +285,15 @@ void mac_poll_timer_trig(uint32_t poll_time, protocol_interface_info_entry_t *cu
 static mac_neighbor_table_entry_t *neighbor_data_poll_referesh(protocol_interface_info_entry_t *cur, uint8_t *address, addrtype_t type)
 {
     mac_neighbor_table_entry_t *entry = mac_neighbor_table_address_discover(mac_neighbor_info(cur), address, type);
+
     if (!entry) {
         return NULL;
     }
 
-    if (entry->connected_device) {
+    if (!entry->connected_device) {
         return NULL;
     }
 
-
     if (!entry->nud_active) {
         entry->lifetime = entry->link_lifetime;
     }

source/Service_Libs/mac_neighbor_table/mac_neighbor_table.c

@@ -140,6 +140,10 @@ mac_neighbor_table_entry_t *mac_neighbor_table_entry_allocate(mac_neighbor_table
     entry->mac16 = 0xffff;
     entry->rx_on_idle = true;
     entry->ffd_device = true;
+    entry->nud_active = false;
+    entry->advertisment = false;
+    entry->connected_device = false;
+    entry->trusted_device = false;
     entry->lifetime = NEIGHBOR_CLASS_LINK_DEFAULT_LIFETIME;
     entry->link_lifetime = NEIGHBOR_CLASS_LINK_DEFAULT_LIFETIME;
     entry->link_role = NORMAL_NEIGHBOUR;