private async void ConnectGenericDevice()
{
if (ChosenDevice != null)
{
await CheckBluetoothStatus(true); // check bluetooth status and activate it if is turned off
if (!IsBluetoothEnabled)
{
AddLog("Can not connect with bluetooth disabled. Turn on the Bluetooth and try again.", AppLog.LogCategory.Warning);
return;
}
// request access to the selected device
BluetoothDevice = await BluetoothLEDevice.FromIdAsync(ChosenDevice.Id);
DeviceAccessStatus accessStatus = await BluetoothDevice.RequestAccessAsync();
// log
AddLog("[Connection: " + accessStatus.ToString() + "]" + " Connecting to " + BluetoothDevice.Name + "...", AppLog.LogCategory.Debug);
AddLog("Connecting to " + BluetoothDevice.Name + "...", AppLog.LogCategory.Info);
GattCharacteristicsResult hrGattCHaracteristics = null;
// try to read the device charateristics
try {
var gattDeviceServicesResult = await BluetoothDevice.GetGattServicesForUuidAsync(HRserviceGuid); // get services with the HR service GUID
// for each service withe the given GUID try to read get
foreach (GattDeviceService service in gattDeviceServicesResult.Services)
{
AddLog("[" + ChosenDevice.Name + "] Found service. " +
"\n - Handle: " + service.AttributeHandle.ToString() +
"\n - UUID: " + service.Uuid.ToString(), AppLog.LogCategory.Debug); // log
if (await service.GetCharacteristicsForUuidAsync(HRCharacteristicGuid) != null)
{
hrGattCHaracteristics = await service.GetCharacteristicsForUuidAsync(HRCharacteristicGuid);
HRReaderService = service;
break;
}
}
} catch {
AddLog("Device \"" + ChosenDevice.Name + "\" does not support HR service." +
"\nSelect another one from the devices list.", AppLog.LogCategory.Warning);
return;
}
// get the HR reader characteristic
if (hrGattCHaracteristics != null)
{
foreach (GattCharacteristic characteristic in hrGattCHaracteristics.Characteristics.Where(c => c.Uuid.Equals(HRCharacteristicGuid)))
{
HRReaderCharacteristic = characteristic;
}
}
else
{
// log something
return;
}
// if HR characteristic can't be found, show an error and return
if (HRReaderCharacteristic == null)
{
AddLog("Heart rate monitor characteristic NOT found.", AppLog.LogCategory.Debug);
AddLog("Could not connect to Heart Rate service of the device \"" + ChosenDevice.Name + "\".", AppLog.LogCategory.Warning);
return;
}
// if HR characteristic have been found, then start reading process
else
{
AddLog("Heart rate monitor characteristic found [Handle: " +
HRReaderCharacteristic.AttributeHandle.ToString() + "]", AppLog.LogCategory.Debug);
BeginBluetoothReadProcess();
SwitchConnectButtonToDisconnectButton();
}
}
else
{
AddLog("The button should be disabled. Kowalski analisis.", AppLog.LogCategory.Debug);
return;
}
}