Wi-sun BBR route update fix

Before add default route and Prefix based on route check that BBR backbone interface is configured.

Change-Id: I79f2394e4ffd66d30e16f62e00b2341259ec4467

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_bbr_api.c

@@ -437,8 +437,9 @@ static void ws_bbr_rpl_status_check(protocol_interface_info_entry_t *cur)
             if (configuration & BBR_GUA_ROUTE) {
                 rpl_control_update_dodag_route(protocol_6lowpan_rpl_root_dodag, current_global_prefix, 64, 0, 0, true);
             }
-            ipv6_route_add_with_info(current_global_prefix, 64, backbone_interface_id, NULL, ROUTE_THREAD_BBR, NULL, 0, 120, 0);
-
+            if (backbone_interface_id >= 0) {
+                ipv6_route_add_with_info(current_global_prefix, 64, backbone_interface_id, NULL, ROUTE_THREAD_BBR, NULL, 0, 120, 0);
+            }
             ws_bbr_dhcp_server_stop(cur, current_global_prefix);
         }
         // TODO add global prefix
@@ -447,9 +448,11 @@ static void ws_bbr_rpl_status_check(protocol_interface_info_entry_t *cur)
             tr_info("RPL global prefix activate %s", trace_ipv6_prefix(global_prefix, 64));
             // Add default route to RPL
             // Enable default routing to backbone
-            if (ipv6_route_add_with_info(global_prefix, 64, backbone_interface_id, NULL, ROUTE_THREAD_BBR, NULL, 0, 0xffffffff, 0) == NULL) {
-                tr_err("global route add failed");
-                return;
+            if (backbone_interface_id >= 0) {
+                if (ipv6_route_add_with_info(global_prefix, 64, backbone_interface_id, NULL, ROUTE_THREAD_BBR, NULL, 0, 0xffffffff, 0) == NULL) {
+                    tr_err("global route add failed");
+                    return;
+                }
             }
             ws_bbr_dhcp_server_start(cur, global_prefix);
             rpl_control_update_dodag_prefix(protocol_6lowpan_rpl_root_dodag, global_prefix, 64, 0, 0, 0, false);