If you need to create a connection with a Bluetooth LE device

Question

For a bluetooth project with Xamarin (Android API 21 and above), I would like to know if creating a connection with a Bluetooth device is normal. Current requirements:

• A Bluetooth device is used often but not constantly.
• Reconnecting should be as fast as possible.
• The Bluetooth address changes randomly when the device is turned off.
• Device name unknown, blank or random
• The connection is encrypted.
• The connection uses an overlying API, for which a Bluetooth device is required as a parameter for the connection.

You should create a connection with this device for "better" recognition (as a kind of cache) or reconnect to the device from scratch. What is common in this scenario? So, this is not the question “Can I fasten”, but whether it is necessary to bind or even better: what is the corrective and the working, reliable script.

I am currently using code like this (result.Device.Name is for dev purposes):

  public override void OnScanResult([GeneratedEnum] ScanCallbackType callbackType, ScanResult result)
    {

        if (result.Device.Name == "  " &&

            !_discovered &&
          result.ScanRecord != null &&
          result.ScanRecord.ServiceUuids != null &&
          result.ScanRecord.ServiceUuids.Any(x => x.Uuid.ToString().ToUpper() == uuid))
        {
            lock (_locker)
            {
                _discovered = true;
                _deviceList.Add(result.Device);
                BluetoothDiscoverySucces?.Invoke(result.Device);
            }
        }
    }

Answer 1

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