private void UpdatePairingButtons()
{
RfcommChatDeviceDisplay deviceDisp = (RfcommChatDeviceDisplay)resultsListView.SelectedItem;
if (null != deviceDisp)
{
ConnectButton.IsEnabled = true;
}
else
{
ConnectButton.IsEnabled = false;
}
}
/// <summary>
/// Invoked once the user has selected the device to connect to.
/// Once the user has selected the device,
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ConnectButton_Click(object sender, RoutedEventArgs e)
{
// Make sure user has selected a device first
if (resultsListView.SelectedItem != null)
{
rootPage.NotifyUser("Connecting to remote device. Please wait...", NotifyType.StatusMessage);
}
else
{
rootPage.NotifyUser("Please select an item to connect to", NotifyType.ErrorMessage);
return;
}
RfcommChatDeviceDisplay deviceInfoDisp = resultsListView.SelectedItem as RfcommChatDeviceDisplay;
// Perform device access checks before trying to get the device.
// First, we check if consent has been explicitly denied by the user.
DeviceAccessStatus accessStatus = DeviceAccessInformation.CreateFromId(deviceInfoDisp.Id).CurrentStatus;
if (accessStatus == DeviceAccessStatus.DeniedByUser)
{
rootPage.NotifyUser("This app does not have access to connect to the remote device (please grant access in Settings > Privacy > Other Devices", NotifyType.ErrorMessage);
return;
}
// If not, try to get the Bluetooth device
try
{
bluetoothDevice = await BluetoothDevice.FromIdAsync(deviceInfoDisp.Id);
}
catch (Exception ex)
{
rootPage.NotifyUser(ex.Message, NotifyType.ErrorMessage);
return;
}
// If we were unable to get a valid Bluetooth device object,
// it's most likely because the user has specified that all unpaired devices
// should not be interacted with.
if (bluetoothDevice == null)
{
rootPage.NotifyUser("Bluetooth Device returned null. Access Status = " + accessStatus.ToString(), NotifyType.ErrorMessage);
}
// This should return a list of uncached Bluetooth services (so if the server was not active when paired, it will still be detected by this call
var rfcommServices = await bluetoothDevice.GetRfcommServicesForIdAsync(
RfcommServiceId.FromUuid(Constants.RfcommChatServiceUuid), BluetoothCacheMode.Uncached);
if (rfcommServices.Services.Count > 0)
{
chatService = rfcommServices.Services[0];
}
else
{
rootPage.NotifyUser(
"Could not discover the chat service on the remote device",
NotifyType.StatusMessage);
return;
}
// Do various checks of the SDP record to make sure you are talking to a device that actually supports the Bluetooth Rfcomm Chat Service
var attributes = await chatService.GetSdpRawAttributesAsync();
if (!attributes.ContainsKey(Constants.SdpServiceNameAttributeId))
{
rootPage.NotifyUser(
"The Chat service is not advertising the Service Name attribute (attribute id=0x100). " +
"Please verify that you are running the BluetoothRfcommChat server.",
NotifyType.ErrorMessage);
RunButton.IsEnabled = true;
return;
}
var attributeReader = DataReader.FromBuffer(attributes[Constants.SdpServiceNameAttributeId]);
var attributeType = attributeReader.ReadByte();
if (attributeType != Constants.SdpServiceNameAttributeType)
{
rootPage.NotifyUser(
"The Chat service is using an unexpected format for the Service Name attribute. " +
"Please verify that you are running the BluetoothRfcommChat server.",
NotifyType.ErrorMessage);
RunButton.IsEnabled = true;
return;
}
var serviceNameLength = attributeReader.ReadByte();
// The Service Name attribute requires UTF-8 encoding.
attributeReader.UnicodeEncoding = UnicodeEncoding.Utf8;
deviceWatcher.Stop();
lock (this)
{
chatSocket = new StreamSocket();
}
try
{
await chatSocket.ConnectAsync(chatService.ConnectionHostName, chatService.ConnectionServiceName);
SetChatUI(attributeReader.ReadString(serviceNameLength), bluetoothDevice.Name);
chatWriter = new DataWriter(chatSocket.OutputStream);
DataReader chatReader = new DataReader(chatSocket.InputStream);
ReceiveStringLoop(chatReader);
}
catch (Exception ex)
{
switch ((uint)ex.HResult)
{
case (0x80070490): // ERROR_ELEMENT_NOT_FOUND
rootPage.NotifyUser("Please verify that you are running the BluetoothRfcommChat server.", NotifyType.ErrorMessage);
RunButton.IsEnabled = true;
break;
default:
throw;
}
}
}