memcpy (&macmsg.mac, &dev.pl_mac, sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
memcpy (write_std.buf, &macmsg, sizeof (macmsg));
write_std.size = sizeof (macmsg);
memcpy (&macmsg.mac, &dev.pl_mac, sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
memcpy (write_std.buf, &macmsg, sizeof (macmsg));
write_std.size = sizeof (macmsg);