Set global address flag to follow address state

If we have higher than link local scope address global address
becomes available

source/6LoWPAN/ws/ws_bootstrap.c

@@ -124,14 +124,27 @@ static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_
     if(addr->source == ADDR_SOURCE_UNKNOWN) {
         return;
     }
-
     if (reason == ADDR_CALLBACK_DAD_COMPLETE) {
 		//Trig Address Registartion only when Bootstrap is ready
         if (interface->nwk_bootstrap_state == ER_BOOTSRAP_DONE) {
             ws_bootsrap_event_trig(WS_ADDRESS_ADDED, interface->bootStrapId, ARM_LIB_LOW_PRIORITY_EVENT, (void *)addr);
         }
+        if (addr_ipv6_scope(addr->address,interface) > IPV6_SCOPE_LINK_LOCAL) {
+            // at least ula address available inside mesh.
+            interface->global_address_available = true;
+        }
+
     } else if (reason == ADDR_CALLBACK_DELETED) {
         // What to do?
+        // Go through address list and check if there is global address still available
+        interface->global_address_available = false;
+        ns_list_foreach(if_address_entry_t, addr_str, &interface->ip_addresses) {
+            if (addr_ipv6_scope(addr_str->address, interface) > IPV6_SCOPE_LINK_LOCAL) {
+                // at least ula address available inside mesh.
+                interface->global_address_available = true;
+                break;
+            }
+        }
     }
 }
 
@@ -1588,7 +1601,7 @@ static void ws_bootstrap_event_handler(arm_event_s *event)
         break;
     case WS_DISCOVERY_START:
         tr_info("Discovery start");
-        // All trikkles stopped so here can be entered anytime
+        // All trickle timers stopped to allow entry from any state
         cur->ws_info->trickle_pa_running = false;
         cur->ws_info->trickle_pc_running = false;
         cur->ws_info->trickle_pas_running = false;