How to use

sys

function

in

ping

// execute ping and return Probe-specific result
  ping.sys.probe( device.host() , function(isAlive) {

    // announce contact status
    device.emit(isAlive?"contact":"contact:lost")
    
    if (!isAlive) return

    // host is online
    cb && cb( null, { isAlive: true } )
  });