public override void OnCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, GattStatus status)
{
try
{
byte[] deviceIdBytes = characteristic.GetValue();
string deviceIdEncountered = Encoding.UTF8.GetString(deviceIdBytes);
DeviceIdEncountered?.Invoke(this, new BluetoothDeviceProximityDatum(_encounterTimestamp, deviceIdEncountered));
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while getting device ID characteristic value after reading it: " + ex, LoggingLevel.Normal, GetType());
}
finally
{
DisconnectPeripheral(gatt);
}
}
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
peripheral.DiscoveredService += (sender, e) =>
{
try
{
if (e.Error == null)
{
// discover characteristics for newly discovered services
foreach (CBService service in peripheral.Services)
{
if (service.UUID.Equals(_probe.DeviceIdService.UUID))
{
peripheral.DiscoverCharacteristics(new CBUUID[] { _probe.DeviceIdCharacteristic.UUID }, service);
}
}
}
else
{
throw new Exception("Error while discovering service: " + e.Error);
}
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while discovering characteristics: " + ex.Message, LoggingLevel.Normal, GetType());
DisconnectPeripheral(central, peripheral);
}
};
peripheral.DiscoveredCharacteristic += (sender, e) =>
{
try
{
if (e.Error == null)
{
// read device ID for newly discovered characteristics
foreach (CBCharacteristic characteristic in e.Service.Characteristics)
{
if (characteristic.UUID.Equals(_probe.DeviceIdCharacteristic.UUID))
{
peripheral.ReadValue(characteristic);
}
}
}
else
{
throw new Exception("Error while discovering characteristic: " + e.Error);
}
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while reading device ID value from peripheral: " + ex.Message, LoggingLevel.Normal, GetType());
DisconnectPeripheral(central, peripheral);
}
};
peripheral.UpdatedCharacterteristicValue += (sender, e) =>
{
try
{
if (e.Error == null)
{
// characteristic should have a non-null value
if (e.Characteristic.Value == null)
{
throw new Exception("Null updated value for characteristic.");
}
else
{
string encounteredDeviceId = Encoding.UTF8.GetString(e.Characteristic.Value.ToArray());
DeviceIdEncountered?.Invoke(this, new BluetoothDeviceProximityDatum(DateTime.UtcNow, encounteredDeviceId));
}
}
else
{
throw new Exception("Error while updating characteristic value: " + e.Error);
}
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while reporting encountered device ID: " + ex.Message, LoggingLevel.Normal, GetType());
}
finally
{
DisconnectPeripheral(central, peripheral);
}
};
try
{
central.ConnectPeripheral(peripheral);
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while connecting to peripheral: " + ex.Message, LoggingLevel.Normal, GetType());
}
}