Fix global address detection (ARMmbed#2392)

Detect global address availability when DAD is completed. The new
address is not yet in the ip_addresses list and therefore detecting
address scope by looping the IP addresses does not work here.

Author: Arto Kinnunen

source/6LoWPAN/ws/ws_bootstrap.c

@@ -76,7 +76,6 @@
 #define TRACE_GROUP "wsbs"
 
 
-
 static void ws_bootstrap_event_handler(arm_event_s *event);
 static void ws_bootstrap_state_change(protocol_interface_info_entry_t *cur, icmp_state_t nwk_bootstrap_state);
 static bool ws_bootstrap_state_discovery(struct protocol_interface_info_entry *cur);
@@ -221,11 +220,11 @@ static void ws_address_reregister_trig(struct protocol_interface_info_entry *int
 
 static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_entry *interface, const struct if_address_entry *addr, if_address_callback_t reason)
 {
-
     /* No need for LL address registration */
     if (addr->source == ADDR_SOURCE_UNKNOWN || !interface->ws_info) {
         return;
     }
+
     if (reason == ADDR_CALLBACK_DAD_COMPLETE) {
         //If address is generated manually we need to force registration
         if (addr->source != ADDR_SOURCE_DHCP) {
@@ -235,7 +234,10 @@ static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_
                 ws_address_registration_update(interface, addr->address);
             }
             ws_address_reregister_trig(interface);
-
+        }
+        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?
@@ -248,17 +250,17 @@ static void ws_bootstrap_address_notification_cb(struct protocol_interface_info_
         }
         //Discover prefix policy
         addr_policy_remove_by_label(WS_NON_PREFFRED_LABEL);
-    }
 
-    // Check the Address status if we have global address 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;
+        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;
+            }
         }
     }
+
     // Addressing in Wi-SUN interface was changed for Border router send new event so Application can update the state
     if (interface->bootsrap_mode == ARM_NWK_BOOTSRAP_MODE_6LoWPAN_BORDER_ROUTER &&
             interface->nwk_bootstrap_state == ER_BOOTSRAP_DONE) {