bluetoothLeDeviceWrite.cs

BluetoothLEDevice bluetoothLeDevice = await BluetoothLEDevice.FromIdAsync(id);
GattDeviceServicesResult result = await bluetoothLeDevice.GetGattServicesAsync();

if (result.Status == GattCommunicationStatus.Success) {
    LogEvent("DEBUG: Services discovered successfully");

    foreach (GattDeviceService service in result.Services) {
        // Discover characteristics for each service
        GattCharacteristicsResult characteristicsResult = await service.GetCharacteristicsAsync();

        if (characteristicsResult.Status == GattCommunicationStatus.Success) {
            LogEvent("DEBUG: Characteristics discovered for service " + service.Uuid);

            foreach (GattCharacteristic characteristic in characteristicsResult.Characteristics) {
                // Process each characteristic as needed
                // characteristic.Uuid will give you the UUID of the characteristic
                
                // Example: Writing to a characteristic
                var writer = new Windows.Storage.Streams.DataWriter();
                writer.WriteByte(0x01); // Example data to write
                GattCommunicationStatus writeStatus = await characteristic.WriteValueAsync(writer.DetachBuffer());

                if (writeStatus == GattCommunicationStatus.Success) {
                    LogEvent("DEBUG: Write to characteristic " + characteristic.Uuid + " succeeded");
                } else {
                    LogEvent("ERROR: Write to characteristic " + characteristic.Uuid + " failed");
                }
            }
        } else {
            LogEvent("ERROR: Failed to discover characteristics for service " + service.Uuid);
        }
    }
} else {
    LogEvent("ERROR: Failed to discover services");
}