assert_se(sd_dhcp_server_set_address(server, &address_lo, 8) >= 0);
assert_se(sd_dhcp_server_set_address(server, &address_lo, 8) == -EBUSY);
assert_se(sd_dhcp_server_set_address(server, &address_lo, 8) >= 0);
assert_se(sd_dhcp_server_set_address(server, &address_lo, 8) == -EBUSY);