support udp_broadcast_new also when using IPv6. Suggested by Wolf-Bastian Pttner.

core/net/tcpip.c

@@ -29,7 +29,7 @@
  * This file is part of the Contiki operating system.
  *
  *
- * $Id: tcpip.c,v 1.20 2009/04/06 13:18:12 nvt-se Exp $
+ * $Id: tcpip.c,v 1.21 2009/04/13 19:54:07 nvt-se Exp $
  */
 /**
  * \file
@@ -307,8 +307,12 @@ udp_broadcast_new(u16_t port, void *appstate)
 {
   uip_ipaddr_t addr;
   struct uip_udp_conn *conn;
-  
+
+#if UIP_CONF_IPV6
+  uip_create_linklocal_allnodes_mcast(&addr);
+#else
   uip_ipaddr(&addr, 255,255,255,255);
+#endif /* UIP_CONF_IPV6 */
   conn = udp_new(&addr, port, appstate);
   if(conn != NULL) {
     udp_bind(conn, port);