Reading raw data via Bluetooth

两盒软妹~` 提交于 2019-12-04 09:10:40

Try this:

var client = new BluetoothClient();
var dlg = new SelectBluetoothDeviceDialog();
DialogResult result = dlg.ShowDialog(this);
if (result != DialogResult.OK)
{
    return;
}
BluetoothDeviceInfo device = dlg.SelectedDevice;
BluetoothAddress addr = device.DeviceAddress;
Console.WriteLine(device.DeviceName);
BluetoothSecurity.PairRequest(addr, "Whatever pin");
device.SetServiceState(BluetoothService.HumanInterfaceDevice, true);
Thread.Sleep(100); // Just in case
if (device.InstalledServices.Length == 0)
{
    // I wouldn't know why it doesn't install the service
}
client.Connect(addr, BluetoothService.HumanInterfaceDevice);

I am no expert by any means, but for me:

  1. I need to pair the device if the device doesn't show in the Bluetooth devices. You just need to do this once with every new device you discover with the Bluetooth radio, or if you uninstall it, I do it every time anyway just in case a new device is selected.
  2. Start the service, once I do this the device will show that a serial port (in your case HID) is available under "Services" in the device's properties.
  3. Connect

In every stage something needs to happen:

  1. Make sure the device appears in "Bluetooth devices" in the "Control panel".
  2. Under the "Services" tab inside the device's "Properties" it should say "Human Interface" or something.
  3. That service should be ticked.

On another note, the exception that you get is really cryptic, but it just made me think if the device is not already connected to something. If you check "device.Connected" it must return false or you won't ever be able to connect.

Arturo's answer is correct. Use SetServiceState (or maybe BluetoothSecurity.PairRequest will do it automatically) to have the Bluetooth stack handle the low-level HID comms and expose the HID events through Windows' HID API. Then your code can use that API.

In more details:

a) HID on Bluetooth doesn't use RFCOMM and that's what BluetoothClient uses. See Bluetooth Profiles and 32feet.NET for more info on what protocol each profile/services uses. There's no simple L2CAP API to use with the Microsoft stack so there's no support (yet?) for L2CapClient there.

b) If one (could) use L2CapClient then one would need to read and write the raw HID data and decode and parse the HID frames. Instead you should get the Bluetooth stack to connect to the device and use the Windows HID APIs to see the button presses. In my 32feet.NET documentation that's point 3 at http://32feet.codeplex.com/documentation

c) The is apparently some fault in e.g. the PS3 Bluetooth controller which means that the Windows HID service can't use it. In that case people do have to connect to the device directly. Apparently...

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