In theory, sending secs set to constant zero should be ok too.
But some bleeping servers can actually be configured to answer ONLY
if secs is bigger than a preset value (!!)
http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man8/bootpd.8.html
grep for "reply_threshold_seconds"
function old new delta
udhcpc_main 2573 2623 +50
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>