code: function announce (server, service) {
    var delay = 1000
    var packet = service._records()
  
    server.register(packet)
  
    ;(function broadcast () {
      // abort if the service have or is being stopped in the meantime
      if (!service._activated || service._destroyed) return
  
      server.mdns.respond(packet, function () {
        // This function will optionally be called with an error object. We'll
        // just silently ignore it and retry as we normally would
        if (!service.published) {
          service._activated = true
          service.published = true
          service.emit('up')
        }
        delay = delay * REANNOUNCE_FACTOR
        if (delay < REANNOUNCE_MAX_MS && !service._destroyed) {
          setTimeout(broadcast, delay).unref()
        }
      })
    })()
  }
docs: Initial service announcement
  
  Used to announce new services when they are first registered.
  
  Broadcasts right away, then after 3 seconds, 9 seconds, 27 seconds,
  and so on, up to a maximum interval of one hour.