Don't send updates on idle networks.

babel.c

@@ -404,10 +404,12 @@ main(int argc, char **argv)
             timeval_min(&tv, &nets[i].flush_time);
             timeval_min_sec(&tv,
                             nets[i].hello_time + nets[i].hello_interval);
+            if(!network_idle(&nets[i])) {
                 timeval_min_sec(&tv, nets[i].self_update_time +
                                 nets[i].self_update_interval);
                 timeval_min_sec(&tv, nets[i].update_time + update_interval);
             }
+        }
         timeval_min(&tv, &update_flush_time);
         FD_ZERO(&readfds);
         if(timeval_compare(&tv, &now) > 0) {
@@ -477,15 +479,17 @@ main(int argc, char **argv)
         for(i = 0; i < numnets; i++) {
             if(now.tv_sec >= nets[i].hello_time + nets[i].hello_interval)
                 send_hello(&nets[i]);
-            if(now.tv_sec >= nets[i].update_time + update_interval)
-                send_update(NULL, &nets[i]);
             if(now.tv_sec >= nets[i].txcost_time + nets[i].txcost_interval)
                 send_txcost(NULL, &nets[i]);
+            if(!network_idle(&nets[i])) {
+                if(now.tv_sec >= nets[i].update_time + update_interval)
+                    send_update(NULL, &nets[i]);
                 if(now.tv_sec >=
                    nets[i].self_update_time + nets[i].self_update_interval) {
                     send_self_update(&nets[i], 0);
                 }
             }
+        }
 
         if(debug || dumping) {
             dump_tables(stdout);