private async void EnumeratingChara(GattDeviceService service)
{
string charaName;
characteristics = null;
try
{
var accessStatus = await service.RequestAccessAsync();
if (accessStatus == DeviceAccessStatus.Allowed)
{
var result = await service.GetCharacteristicsAsync(BluetoothCacheMode.Uncached);
if (result.Status == GattCommunicationStatus.Success)
{
characteristics = result.Characteristics;
}
else
{
NotifyUser("Error accessing service.", NotifyType.ErrorMessage);
characteristics = new List <GattCharacteristic>();
}
}
else
{
NotifyUser("Error accessing service.", NotifyType.ErrorMessage);
characteristics = new List <GattCharacteristic>();
}
}
catch (Exception ex)
{
NotifyUser("Restricted service. Can't read charcteristics:" + ex.Message, NotifyType.ErrorMessage);
characteristics = new List <GattCharacteristic>();
}
var chara = characteristics[0];
charaName = DisplayHelpers.GetCharacteristicName(chara);
CharaReadUUID.Text = charaName;
CharaReadUUIDBorder.Visibility = Visibility.Visible;
EnumerationReadDescriptor(chara);
chara = characteristics[1];
charaName = DisplayHelpers.GetCharacteristicName(chara);
CharaWriteUUID.Text = charaName;
CharaWriteUUIDBorder.Visibility = Visibility.Visible;
EnumerationWriteDescriptor(chara);
CharaReadUUIDBorder.Visibility = Visibility.Visible;
}
private async void ConnectButton_Click(object sender, RoutedEventArgs e)
{
ConnectButton.IsEnabled = false;
ClearBluetoothLEDeviceAsync();
try
{
// BT_Code: BluetoothLEDevice.FromIdAsync must be called from a UI thread because it may prompt for consent.
bluetoothLeDevice = await BluetoothLEDevice.FromIdAsync(bleDeviceDisplay.Id);
if (bluetoothLeDevice == null)
{
NotifyUser("Failed to connect to device.", NotifyType.ErrorMessage);
ConnectButton.IsEnabled = true;
}
}
catch (Exception ex) when(ex.HResult == E_DEVICE_NOT_AVAILABLE)
{
NotifyUser("Bluetooth radio is not on.", NotifyType.ErrorMessage);
ConnectButton.IsEnabled = true;
}
if (bluetoothLeDevice != null)
{
// Note: BluetoothLEDevice.GattServices property will return an empty list for unpaired devices. For all uses we recommend using the GetGattServicesAsync method.
// BT_Code: GetGattServicesAsync returns a list of all the supported services of the device (even if it's not paired to the system).
// If the services supported by the device are expected to change during BT usage, subscribe to the GattServicesChanged event.
GattDeviceServicesResult result = await bluetoothLeDevice.GetGattServicesAsync(BluetoothCacheMode.Uncached);
if (result.Status == GattCommunicationStatus.Success)
{
var services = result.Services;
string serviceName;
foreach (var service in services)
{
serviceName = DisplayHelpers.GetServiceName(service);
if (serviceName.IndexOf("Custom Service") >= 0)
{
NotifyUser("Found custom service", NotifyType.StatusMessage);
ServiceUUID.Text = DisplayHelpers.GetServiceName(service);
ServiceUUIDBorder.Visibility = Visibility.Visible;
EnumeratingChara(service);
ConnectButton.IsEnabled = false;
break;
}
else
{
NotifyUser("Not found customr service", NotifyType.ErrorMessage);
ConnectButton.IsEnabled = true;
}
}
}
else
{
NotifyUser("Device unreachable", NotifyType.ErrorMessage);
ConnectButton.IsEnabled = true;
}
}
}