func (smb *SMBroadcaster) handleCancelledStopVisit(stopVisit *model.StopVisit, delivery *siri.SIRINotifyStopMonitoringDelivery, stopMonitoringBuilder *BroadcastStopMonitoringBuilder) bool {
    cancelledStopVisit := stopMonitoringBuilder.BuildCancelledStopVisit(stopVisit)
    if cancelledStopVisit == nil {
        return false
    }