public override void OnCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic)
{
if (characteristic.Uuid.Equals(DT1WatchDogService.DT1WatchdogDataCharacteristicUUID))
{
log.Debug("Watchdog data characteristic changed.");
// we got data - fine we disconnect and wait for the next alarm
var CLIENT_CHARACTERISTIC_CONFIG = Java.Util.UUID.FromString("00002902-0000-1000-8000-00805f9b34fb");
var clientCharacteristiConfigDescriptor = characteristic.GetDescriptor(CLIENT_CHARACTERISTIC_CONFIG);
clientCharacteristiConfigDescriptor.SetValue(BluetoothGattDescriptor.DisableNotificationValue.ToArray());
gatt.WriteDescriptor(clientCharacteristiConfigDescriptor);
gatt.Disconnect();
var data = characteristic.GetValue();
var reading = GlucoseReading.ParseRawCharacteristicData(data);
// fill in source
reading.Source = gatt.Device.Name;
dataService.PersistReading(reading);
if (reading.ErrorCode == GlucoseReading.ReadingErrorCode.NoError)
{
dataService.LastValidReading = DateTimeOffset.UtcNow;
EvaluateReading(reading);
}
var dataIntent = new Intent(DT1WatchDogService.IntentIncommingData);
service.SendBroadcast(dataIntent);
}
}
public async Task ScanReadingsAsync()
{
if (watchdogDevice == null)
{
throw new InvalidOperationException("ScanReadings can only be executed after a device was detected.");
}
if ((watchdogDevice.Status == ConnectionStatus.Connected) || (watchdogDevice.Status == ConnectionStatus.Connecting))
{
return;
}
await watchdogDevice.Connect();
var service = await watchdogDevice.GetKnownService(DT1WatchdogSericeUuid);
service.WhenCharacteristicDiscovered().Subscribe(async x =>
{
if (x.Uuid == DT1WatchdogDataCharacteristicUUID)
{
if (await x.EnableNotifications())
{
x.WhenNotificationReceived().Subscribe((result) =>
{
result.Characteristic.DisableNotifications();
result.Characteristic.Service.Device.CancelConnection();
var reading = GlucoseReading.ParseRawCharacteristicData(result.Data);
});
}
}
});
}
private void EvaluateReading(GlucoseReading reading)
{
if (reading.GlucoseLatest < DT1WatchDogService.NonConditionalHypoglycemiaThresholdmgdl)
{
service.TriggerAlert(DT1WatchDogService.AlertType.Hypoglycemia, reading.GlucoseLatest.ToString() + "mgdl", false);
return;
}
if (reading.GlucoseLatest < DT1WatchDogService.ConditionalHypoglycemiaThresholdmgdl)
{
service.TriggerAlert(DT1WatchDogService.AlertType.Hypoglycemia, reading.GlucoseLatest.ToString() + "mgdl", true);
return;
}
if (reading.GetPredictedGlucoseValue(DT1WatchDogService.PredictionInterval) < DT1WatchDogService.ConditionalHypoglycemiaThresholdmgdl)
{
service.TriggerAlert(DT1WatchDogService.AlertType.PredictedHypoglycemia, reading.GlucoseLatest.ToString() + "mgdl", true);
return;
}
if (reading.GlucoseLatest > DT1WatchDogService.HyperglycemiaThresholdmgdl)
{
service.TriggerAlert(DT1WatchDogService.AlertType.Hyperglycemia, reading.GlucoseLatest.ToString() + "mgdl", true);
return;
}
if (reading.GetPredictedGlucoseValue(DT1WatchDogService.PredictionInterval) > DT1WatchDogService.HyperglycemiaThresholdmgdl)
{
service.TriggerAlert(DT1WatchDogService.AlertType.PredictedHyperglycemia, reading.GlucoseLatest.ToString() + "mgdl", true);
return;
}
if (reading.PerCentCharge < DT1WatchDogService.LowPowerThresholdPerCent)
{
service.TriggerAlert(DT1WatchDogService.AlertType.LowBattery, reading.PerCentCharge + "%", false);
return;
}
service.TriggerValidInRangeReading();
}
