WindowsデスクトップアプリでBLEのGATTで体温計と血圧計と通信する ref: https://qiita.com/gebo/items/41da7474936845d77d06

C#

byte[] c1 = data.Skip(1).Take(2).ToArray();
var val = Common.ConvertToFloat(c1, Common.ConvType.IEEE_11073_16bit_float);
Console.WriteLine($"Blood Pressure Measurement Compound Value - Systolic(最高血圧)    = {val}mmHg");

file0.txt

// DeviceInformation.FindAllAsync()でDeviceInformationCollectionクラス(リスト)をGETする
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(GattDeviceService.GetDeviceSelectorFromUuid(new Guid("00001809-0000-1000-8000-00805f9b34fb")));

//GattDeviceService.FromIdAsync()でGattDeviceServiceクラスを取得する
GattDeviceService service = await GattDeviceService.FromIdAsync(devices.First().Id);

// service使って処理する
・・・

file1.txt

public async void Start()
{
    // アドバタイズパケットの受信開始
    this.advWatcher = new BluetoothLEAdvertisementWatcher();
    this.advWatcher.Start();
}

private async void Watcher_Received(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
{
    // アドバタイズパケット受信→Health Thermometerサービスを検索
    var bleServiceUUIDs = args.Advertisement.ServiceUuids;
    foreach (var uuidone in bleServiceUUIDs) {
        if (uuidone == new Guid("00001809-0000-1000-8000-00805f9b34fb")) {
            // 発見
            this.advWatcher.Stop();
            BluetoothLEDevice dev = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
            GattDeviceService service = dev.GetGattService(new Guid("00001809-0000-1000-8000-00805f9b34fb"));

            // service使って処理する

            break;
        }
    }
}

file2.txt

// Get Service
this.Service = await GattDeviceService.FromIdAsync(devices.First().Id);

file3.txt

var bleServiceUUIDs = args.Advertisement.ServiceUuids;
foreach (var uuidone in bleServiceUUIDs) {
    if (uuidone == new Guid("00001809-0000-1000-8000-00805f9b34fb")) {
        // 発見
        this.advWatcher.Stop();
        BluetoothLEDevice dev = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
        this.Service = dev.GetGattService(new Guid("00001809-0000-1000-8000-00805f9b34fb"));
        find = true;
        break;
    }
}

file4.txt

var characteristics = Service.GetCharacteristics(new Guid("00002A1C-0000-1000-8000-00805f9b34fb"));
this.Characteristic_Temperature_Measurement = characteristics.First();
if (this.Characteristic_Temperature_Measurement.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Indicate)) {
    this.Characteristic_Temperature_Measurement.ValueChanged += characteristicChanged_Temperature_Measurement;
    await this.Characteristic_Temperature_Measurement.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Indicate);
}

file5.txt

byte[] data = new byte[eventArgs.CharacteristicValue.Length];
Windows.Storage.Streams.DataReader.FromBuffer(eventArgs.CharacteristicValue).ReadBytes(data);

// Parse
byte[] c1 = data.Skip(1).Take(4).ToArray();
var temperature = Common.ConvertToFloat(c1, Common.ConvType.IEEE_1073_32bit_float);

file6.txt

var characteristics = Service.GetCharacteristics(Common.CreateFullUUID("2A49"));
var chara = characteristics.First();
if (chara.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Read)) {
    GattReadResult result = await chara.ReadValueAsync();
    var reader = Windows.Storage.Streams.DataReader.FromBuffer(result.Value);
    byte[] input = new byte[reader.UnconsumedBufferLength];
    reader.ReadBytes(input);
    ...
}

file7.txt

byte[] c1 = data.Skip(1).Take(2).ToArray();
var val = Common.ConvertToFloat(c1, Common.ConvType.IEEE_11073_16bit_float);
Console.WriteLine($"Blood Pressure Measurement Compound Value - Systolic(最高血圧)    = {val}mmHg");

GitHubからの抜粋Source_Health_Thermometer

private GattDeviceService Service;

public async void Start()
{
    // アドバタイズパケットの受信開始
    this.advWatcher = new BluetoothLEAdvertisementWatcher();
    this.advWatcher.Start();
}

private async void Watcher_Received(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
{
    // アドバタイズパケット受信→Health Thermometerサービスを検索
    bool find = false;
    var bleServiceUUIDs = args.Advertisement.ServiceUuids;
    foreach (var uuidone in bleServiceUUIDs) {
        if (uuidone == new Guid("00001809-0000-1000-8000-00805f9b34fb")) {
            // 発見
            this.advWatcher.Stop();
            BluetoothLEDevice dev = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
            this.Service = dev.GetGattService(new Guid("00001809-0000-1000-8000-00805f9b34fb"));
            find = true;
            break;
        }
    }

    if (find) {

        // Get Temperature Measurement Characteristic
        // Requirement = M , Mandatory Properties = Indicate
        {
            var characteristics = Service.GetCharacteristics(new Guid("00002A1C-0000-1000-8000-00805f9b34fb"));
            this.Characteristic_Temperature_Measurement = characteristics.First();
            if (this.Characteristic_Temperature_Measurement.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Indicate)) {
                this.Characteristic_Temperature_Measurement.ValueChanged += characteristicChanged_Temperature_Measurement;
                await this.Characteristic_Temperature_Measurement.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Indicate);
            }
        }

        // Get Intermediate Temperature Characteristic
        // Requirement = O , Mandatory Properties = Notify
        {
            var characteristics = Service.GetCharacteristics(new Guid("00002A1E-0000-1000-8000-00805f9b34fb"));
            this.Characteristic_Intermediate_Temperature = characteristics.First();
            if (this.Characteristic_Intermediate_Temperature.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Notify)) {
                this.Characteristic_Intermediate_Temperature.ValueChanged += characteristicChanged_Intermediate_Temperature;
                await this.Characteristic_Intermediate_Temperature.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
            }
        }
    }
}

// Temperature_Measurement　体温測定値
private GattCharacteristic Characteristic_Temperature_Measurement;
private void characteristicChanged_Temperature_Measurement(GattCharacteristic sender, GattValueChangedEventArgs eventArgs)
{
    byte[] data = new byte[eventArgs.CharacteristicValue.Length];
    Windows.Storage.Streams.DataReader.FromBuffer(eventArgs.CharacteristicValue).ReadBytes(data);

    // Parse
    byte[] c1 = data.Skip(1).Take(4).ToArray();
    var temperature = Common.ConvertToFloat(c1, Common.ConvType.IEEE_11073_32bit_float);

    return;
}

// Intermediate_Temperature　体温の変化通知
private GattCharacteristic Characteristic_Intermediate_Temperature;
private void characteristicChanged_Intermediate_Temperature(GattCharacteristic sender, GattValueChangedEventArgs eventArgs)
{
    byte[] data = new byte[eventArgs.CharacteristicValue.Length];
    Windows.Storage.Streams.DataReader.FromBuffer(eventArgs.CharacteristicValue).ReadBytes(data);
    return;
}