private void BluetoothLEService_ConnectionStateChanged(object sender, ConnectionStateChangedEventArgs e)
{
if (e.NewStatus == ProfileState.Disconnected && _bluetoothLEService != null)
{
_bluetoothLEService.CharacteristicNotificationReceived -= BluetoothLEService_CharacteristicNotificationReceived;
_bluetoothLEService = null;
SetControlsEnabled(false);
RunOnUiThread(() =>
{
_retryConnectButton.Visibility = ViewStates.Visible;
_retryConnectButton.Enabled = true;
});
ShowAlert("Bluetooth Disconnected", "Device has disconnected or lost connection. Reconnect and try again.");
}
}
private async void BluetoothLEScanner_DeviceDiscovered(object sender, DeviceDiscoveredEventArgs e)
{
_bluetoothLEService = new BluetoothLEService(this, e.Device);
BluetoothLEScanner.Current.StopScan();
_progressBar.Visibility = ViewStates.Visible;
var result = await _bluetoothLEService.ConnectGattAsync();
if (result.NewStatus != ProfileState.Connected)
{
_retryConnectButton.Enabled = true;
_progressBar.Visibility = ViewStates.Gone;
ShowAlert("Bluetooth Connection Error", "Could not connect to device.");
return;
}
_bluetoothLEService.ConnectionStateChanged -= BluetoothLEService_ConnectionStateChanged;
_bluetoothLEService.ConnectionStateChanged += BluetoothLEService_ConnectionStateChanged;
var readResult = await _bluetoothLEService.ReadCharacteristicAsync(BluetoothConstants.ServiceUuid,
BluetoothConstants.StatusCharacteristicUuid);
_progressBar.Visibility = ViewStates.Gone;
if (readResult.GattStatus != GattStatus.Success)
{
ShowAlert("Get Status Failed", $"Failed to get current status.");
}
_bluetoothLEService.CharacteristicNotificationReceived -= BluetoothLEService_CharacteristicNotificationReceived;
_bluetoothLEService.CharacteristicNotificationReceived += BluetoothLEService_CharacteristicNotificationReceived;
var subscribeResult = _bluetoothLEService.SubscribeCharacteristicNotification(BluetoothConstants.ServiceUuid,
BluetoothConstants.StatusCharacteristicUuid);
if (subscribeResult.GattStatus != GattStatus.Success)
{
ShowAlert("Status Subscription Failed", $"Failed to subscribe for status changes.");
}
UpdateStatus(readResult.Response);
SetControlsEnabled(true);
_retryConnectButton.Visibility = ViewStates.Gone;
}
private void Init()
{
if (_bluetoothLEService != null)
{
_bluetoothLEService.CharacteristicNotificationReceived -= BluetoothLEService_CharacteristicNotificationReceived;
}
_bluetoothLEService = null;
SetControlsEnabled(false);
_retryConnectButton.Visibility = ViewStates.Visible;
var permissions = new[]
{
Manifest.Permission.AccessCoarseLocation,
Manifest.Permission.AccessFineLocation,
Manifest.Permission.Bluetooth,
Manifest.Permission.BluetoothAdmin
};
RequestPermissions(permissions, PermissionsRequestCode);
}