Better use !ping to bypass the default ping alias. Also, that didn't reset my idle time on UnderNet.

Code:

on *:START: {
  .timerAnti-Idle -oi 0 30 scon -at1 !.ctcp $!me Anti-Idle
}

ctcp *:Anti-Idle:?: {
  if (($nick == $me) && ($1 == Anti-Idle)) haltdef
}


EnglishExpress change that 30 seconds to whatever you want although I would go much less than that if any.

~ Edit ~

Fixed typo and prefixed ctcp command with a .