private async void btnSend_Click(object sender, EventArgs e)
        {
            var svc = new SmlComServiceClient();
            var activeStations = SystemCtrl.GetAllStations()
                .Where(s => s.IsOccupiedByDevice && 
                            !string.IsNullOrWhiteSpace(s.Device.GetParameterScanValue(ParameterTagId.PcbBarCode)))
                .ToList();
            if (!activeStations.Any())
            {
                MessageBox.Show("Keine Station mit gescannten Reallin Barcodes gefunden");
                return;
            }

            var comPorts = activeStations.Select(s => new CommunicationPort()
            {
                ComPortName = s.ComAddress,
                MeterType = MeterType.Basemeter
            }).ToArray();

            // update scan results
            foreach (var station in activeStations)
            {

                var device = station.Device;
                this.deviceRepository.UpdateDevice(device);
            }

            try
            {
                var result = await svc.ConfigurePortsAsync(comPorts, new Guid());
                var guid = Guid.Parse(result);

                var tasks =
                    activeStations.Select(
                        s =>
                            s.ProcessDevice(svc, guid, comPorts.Single(p => p.ComPortName == s.ComAddress),
                                this.cts.Token)).ToArray();

                await Task.WhenAll(tasks);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            
            this.LoadDevices();
        }