private void OnServiceAdded(object sender, ServiceAnnouncementEventArgs e)
        {
            var detectedVent = new Ventilator
            {
                IP = e.Announcement.Addresses.First().ToString(),
            };

            foreach (var txt in e.Announcement.Txt)
            {
                var split = txt.Split('=');
                var id    = split[0];
                if (id == "fn")
                {
                    detectedVent.Name = split[1];
                }
            }

            bool found = false;

            foreach (var disc in FoundVentilators)
            {
                if (disc.IP == detectedVent.IP)
                {
                    found = true;
                    break;
                }
            }

            if (!found)
            {
                FoundVentilators.Add(detectedVent);
            }
        }
        private void OnServiceRemoved(object sender, ServiceAnnouncementEventArgs e)
        {
            IPAddress  id       = e.Announcement.Addresses.First();
            Ventilator toRemove = null;

            foreach (var disc in FoundVentilators)
            {
                if (IPAddress.Parse(disc.IP) == id)
                {
                    toRemove = disc;
                    break;
                }
            }
            if (toRemove != null)
            {
                FoundVentilators.Remove(toRemove);
            }
        }