private void App_Suspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e)
{
IsServiceInitialized = false;
// This is an appropriate place to save to persistent storage any datapoint the application cares about.
// For the purpose of this sample we just discard any values.
datapoints.Clear();
// Allow the GattDeviceService to get cleaned up by the Windows Runtime.
// The Windows runtime will clean up resources used by the GattDeviceService object when the application is
// suspended. The GattDeviceService object will be invalid once the app resumes, which is why it must be
// marked as invalid, and reinitalized when the application resumes.
if (service != null)
{
service.Dispose();
service = null;
}
if (characteristic != null)
{
characteristic = null;
}
if (watcher != null)
{
watcher.Stop();
watcher = null;
}
}
private async void DeviceConnection_Updated(PnpObjectWatcher sender, PnpObjectUpdate args)
{
#if DEBUG
logger.Debug("Device connection updated, args = " + args);
#endif
var connectedProperty = args.Properties["System.Devices.Connected"];
#if DEBUG
logger.Debug("Connected property, args = " + connectedProperty.ToString());
#endif
bool isConnected = false;
if ((deviceContainerId == args.Id) && Boolean.TryParse(connectedProperty.ToString(), out isConnected) &&
isConnected)
{
var status = await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(
CHARACTERISTIC_NOTIFICATION_TYPE);
if (status == GattCommunicationStatus.Success)
{
#if DEBUG
logger.Debug("Stopping device connection watcher");
#endif
// Once the Client Characteristic Configuration Descriptor is set, the watcher is no longer required
watcher.Stop();
watcher = null;
#if DEBUG
logger.Debug("Configuration successfull");
#endif
}
}
}
public void UnregisterForConnectionEvents()
{
if (_connectionWatcher != null)
{
_connectionWatcher.Updated -= DeviceConnection_Updated;
_connectionWatcher.Stop();
_connectionWatcher = null;
}
}
private async void DeviceConnection_Updated(PnpObjectWatcher sender, PnpObjectUpdate args)
{
var connectedProperty = args.Properties[ConnectedProperty];
bool isConnected = false;
if ((_deviceContainerId == args.Id) && Boolean.TryParse(connectedProperty.ToString(), out isConnected) && isConnected)
{
var status = await _characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(CHARACTERISTIC_NOTIFICATION_TYPE);
if (status == GattCommunicationStatus.Success)
{
IsServiceInitialized = true;
_watcher.Stop();
_watcher = null;
}
DeviceConnectionUpdated?.Invoke(isConnected);
}
}
private void App_Suspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e)
{
IsServiceInitialized = false;
// This is an appropriate place to save to persistent storage any datapoint the application cares about.
// Let us save the last known state of the backpack
var lastItem = datapoints.Last();
localSettings.Values["last-backpack-state"] = lastItem.ToString();
// Then clear the information
datapoints.Clear();
// Allow the GattDeviceService to get cleaned up by the Windows Runtime.
// The Windows runtime will clean up resources used by the GattDeviceService object when the application is
// suspended. The GattDeviceService object will be invalid once the app resumes, which is why it must be
// marked as invalid, and reinitalized when the application resumes.
if (service != null)
{
service.Dispose();
service = null;
}
if (rx_characteristic != null)
{
rx_characteristic = null;
}
if (tx_characteristic != null)
{
tx_characteristic = null;
}
if (watcher != null)
{
watcher.Stop();
watcher = null;
}
}
private async void DeviceConnection_Updated(PnpObjectWatcher sender, PnpObjectUpdate args)
{
Log("Device connection updated, args = " + args);
var connectedProperty = args.Properties["System.Devices.Connected"];
bool isConnected = false;
if ((deviceContainerId == args.Id) && Boolean.TryParse(connectedProperty.ToString(), out isConnected) &&
isConnected)
{
var status = await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(
GattClientCharacteristicConfigurationDescriptorValue.Notify);
if (status == GattCommunicationStatus.Success)
{
Log("Stopping device connection watcher");
// Once the Client Characteristic Configuration Descriptor is set, the watcher is no longer required
watcher.Stop();
watcher = null;
Log("Configuration successfull");
}
}
}