/// <summary>
/// Event raised when the bluettoth device notify a value change
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void OnCharacteristicValueChangeEvent(object sender, Plugin.BLE.Abstractions.EventArgs.CharacteristicUpdatedEventArgs e)
{
if (this.eventAggregator == null)
{
eventAggregator = (IEventAggregator)App.Current.Container.Resolve(typeof(IEventAggregator));
}
DialogBehaviourHolder beahaviour = FreeStyleLibreUtils.RespondToPacketBehaviour(e.Characteristic.Value);
switch (beahaviour.ResponseType)
{
case PacketResponseType.Accept:
eventAggregator.GetEvent <MeasureChangeEvent>().Publish(beahaviour.ReceivedData);
this.MeasureServiceState = MeasureServiceState.RECEIVING_DATA;
break;
case PacketResponseType.AnswerBack:
WriteCharacteristicAsync(MiaoMiaoProtocol.NRF_UART_RX, beahaviour.Response);
break;
case PacketResponseType.Refuse:
this.MeasureServiceState = MeasureServiceState.REFUSED_DATA_THEN_WAIT;
break;
case PacketResponseType.Ignore:
default:
this.MeasureServiceState = MeasureServiceState.WAITING_DATA;
break;
}
}
/// <summary>
/// Update the measure offset for a GlucoseMeasure
/// </summary>
/// <param name="measure">The measure to update</param>
/// <param name="offsetValue">The offset value coming from the calibration</param>
/// <param name="appSettings">The appSettings</param>
public GlucoseMeasure UpdateMeasureOffset(GlucoseMeasure measure, float calibrationOffset, AppSettings appSettings)
{
using (var trans = realm.BeginWrite())
{
measure.CalibrationOffset = calibrationOffset;
measure.GlucoseLevelMGDL = (float)Math.Round((decimal)measure.GlucoseLevelRaw / 10) + calibrationOffset;
measure.GlucoseLevelMMOL = (float)FreeStyleLibreUtils.ConvertMGDLToMMolPerLiter(appSettings, measure.GlucoseLevelMGDL);
trans.Commit();
}
return(measure);
}
/// <summary>
/// This methods executes the pairing actions
/// </summary>
private async Task <bool> PairDeviceAsync(Models.Device device)
{
ComputeScanningPropertiesIndicators(ScanningWizardState.Pairing);
availableDevices.Clear();
await Task.Delay(1500);
this.HasConnected = await MeasureService.RegisterDeviceAsync(device);
await Task.Delay(500);
if (HasConnected)
{
this.HasInitializedDevice = await MeasureService.InitializeBLEServicesAsync(device, MiaoMiaoProtocol.UART_SERVICE_ID);
}
await Task.Delay(500);
if (this.HasInitializedDevice)
{
this.HasSubscribed = await MeasureService.SubsrcibeCharacteristicAsync(MiaoMiaoProtocol.NRF_UART_TX);
}
await Task.Delay(500);
if (this.HasSubscribed)
{
// MIAOMIAO PROTOCOL
List <byte[]> resetPacket = new List <byte[]>();
resetPacket.Add(FreeStyleLibreUtils.GenerateResetPacket());
this.HasReadFirstMeasure = await MeasureService.WriteCharacteristicAsync(MiaoMiaoProtocol.NRF_UART_RX, resetPacket);
}
await Task.Delay(1500);
bool HasReadCorrectData = true;
if (this.HasReadFirstMeasure)
{
HasReadCorrectData = MeasureService.CurrentState() != Models.Enums.MeasureServiceState.REFUSED_DATA_THEN_WAIT;
}
return(this.HasConnected && this.HasInitializedDevice && this.HasSubscribed && this.HasReadFirstMeasure && HasReadCorrectData);
}
/// <summary>
/// This method is in charge of awake the device and connects to it
/// NOTE : If an error is raised during its execution, this method calls itself (the called is post delayed)
/// </summary>
/// <returns></returns>
private async Task WakeUpMeasureServiceAsync()
{
Log.Debug(LOG_TAG, GetType() + ".WakeUpMeasureServiceAsync: called");
bool needToPostDelayExecution = false;
User currentUser = this.userRepository.GetCurrentUser();
if (!currentUser.DeviceIsBounded)
{
Log.Debug(LOG_TAG, GetType() + ".WakeUpMeasureServiceAsync: no device bounded. No need to awake the mesure service");
return;
}
Models.Device device = new Models.Device(currentUser.DeviceId, currentUser.DeviceName);
try
{
bool IsDeviceConnected = true;
bool IsInitialized = true;
bool IsSuscribed = true;
bool IsWritten = true;
bool IsRead = true;
// step 1 : register device
IsDeviceConnected = await this.measureService.RegisterDeviceAsync(device);
// step 2 : initializes ble services
if (IsDeviceConnected)
{
IsInitialized = await this.measureService.InitializeBLEServicesAsync(device, MiaoMiaoProtocol.UART_SERVICE_ID);
}
// step 3 : subscription
if (IsInitialized)
{
IsSuscribed = await this.measureService.SubsrcibeCharacteristicAsync(MiaoMiaoProtocol.NRF_UART_TX);
}
// step 4 : reset
// MIAOMIAO PROTOCOL
if (IsSuscribed)
{
List <byte[]> resetPacket = new List <byte[]>();
resetPacket.Add(FreeStyleLibreUtils.GenerateResetPacket());
IsWritten = await this.measureService.WriteCharacteristicAsync(MiaoMiaoProtocol.NRF_UART_RX, resetPacket);
}
// step 5 : the state of the service
if (IsWritten)
{
IsRead = this.measureService.CurrentState() != Models.Enums.MeasureServiceState.REFUSED_DATA_THEN_WAIT;
}
// if there was an error in of the steps, we start over
if (!IsDeviceConnected || !IsInitialized || !IsSuscribed || !IsWritten || !IsRead)
{
needToPostDelayExecution = true;
this.measureService.UnregisterDevice(device);
Log.Debug(LOG_TAG, GetType() + ".WakeUpMeasureServiceAsync: awakening is incomplete");
}
else
{
Log.Debug(LOG_TAG, GetType() + ".WakeUpMeasureServiceAsync: awakening is complete");
}
}
catch (CharacteristicReadException exception)
{
Log.Debug(LOG_TAG, GetType() + ".WakeUpMeasureServiceAsync: " + exception);
if (this.measureService != null && device != null)
{
this.measureService.UnregisterDevice(device);
}
needToPostDelayExecution = true;
}
finally
{
// post delay the execution of this method in X minutes because something went wrong
if (needToPostDelayExecution)
{
await Task.Delay(this.appSettings.MEASURE_SERVICE_RETRY_DEFAULT_TIME * 1000 * 60).ContinueWith(t =>
Xamarin.Forms.Device.BeginInvokeOnMainThread(() => { WakeUpMeasureServiceAsync(); })
);
}
}
}