timeout corrected for neighbour entry (ARMmbed#1508)

Author: deepakvenugopal

source/6LoWPAN/Thread/thread_extension_bbr.c

@@ -714,7 +714,7 @@ static int thread_extension_bbr_dua_cb(int8_t service_id, uint8_t source_address
         entry_keep_alive = false;
     }
 
-    if (thread_bbr_nd_entry_add(this->interface_id, addr_data_ptr, this->dua_timeout + this->delay_timer/500, NULL, ml_eid_ptr) == -1) {
+    if (thread_bbr_nd_entry_add(this->interface_id, addr_data_ptr, 0xFFFFFFFF, NULL, ml_eid_ptr) == -1) {
         bbr_status = THREAD_BBR_STATUS_RESOURCE_SHORTAGE;
         goto send_response;
     }
@@ -968,6 +968,16 @@ void thread_extension_bbr_delete(int8_t interface_id)
 bool thread_extension_bbr_nd_query_process(protocol_interface_info_entry_t *cur, const uint8_t *target_addr)
 {
     uint8_t domain_prefix[8];
+    if (thread_version < THREAD_VERSION_1_2) {
+        return false;
+    }
+    thread_pbbr_t *this = thread_bbr_find_by_interface(cur->id);
+    if (!this) {
+        return false;
+    }
+    if (!this->pbbr_started) {
+        return false;
+    }
     // if we have DUA addressing enabled
     if ( thread_extension_network_prefix_get(cur->id, NULL, domain_prefix, NULL) == 0 &&
          bitsequal(domain_prefix,target_addr,64) ) {