private bool UpdateConnectionIntervalNative(ConnectionInterval interval)
{
if (_gatt == null || _gattCallback == null)
{
Trace.Message("You can't update a connection interval for disconnected devices. Device is {0}", State);
return(false);
}
if (Build.VERSION.SdkInt < BuildVersionCodes.Lollipop)
{
Trace.Message($"Update connection interval paramter in this Android API level");
return(false);
}
try
{
// map to android gattConnectionPriorities
// https://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#CONNECTION_PRIORITY_BALANCED
return(_gatt.RequestConnectionPriority((GattConnectionPriority)(int)interval));
}
catch (Exception ex)
{
throw new Exception($"Update Connection Interval fails with error. {ex.Message}");
}
}
private async Task <bool> UpdateRssiNativeAsync()
{
if (_gatt == null || _gattCallback == null)
{
Trace.Message("You can't read the RSSI value for disconnected devices except on discovery on Android. Device is {0}", State);
return(false);
}
return(await TaskBuilder.FromEvent <bool, EventHandler <RssiReadCallbackEventArgs>, EventHandler>(
execute : () => _gatt.ReadRemoteRssi(),
getCompleteHandler : (complete, reject) => ((sender, args) =>
{
if (args.Error == null)
{
Trace.Message("Read RSSI for {0} {1}: {2}", Id, Name, args.Rssi);
Rssi = args.Rssi;
complete(true);
}
else
{
Trace.Message($"Failed to read RSSI for device {Id}-{Name}. {args.Error.Message}");
complete(false);
}
}),
subscribeComplete : handler => _gattCallback.RemoteRssiRead += handler,
unsubscribeComplete : handler => _gattCallback.RemoteRssiRead -= handler,
getRejectHandler : reject => ((sender, args) =>
{
reject(new Exception($"Device {Name} disconnected while updating rssi."));
}),
subscribeReject : handler => _gattCallback.ConnectionInterrupted += handler,
unsubscribeReject : handler => _gattCallback.ConnectionInterrupted -= handler));
}
private void StartScanningOld(Guid[] serviceUuids)
{
var hasFilter = serviceUuids?.Any() ?? false;
UUID[] uuids = null;
if (hasFilter)
{
uuids = serviceUuids.Select(u => UUID.FromString(u.ToString())).ToArray();
}
Trace.Message("Adapter < 21: Starting a scan for devices.");
#pragma warning disable 618
_bluetoothAdapter.StartLeScan(uuids, _api18ScanCallback);
#pragma warning restore 618
}
public IReadOnlyList <Device> GetSystemConnectedOrPairedDevices(Guid[] services = null)
{
if (services != null)
{
Trace.Message("Caution: GetSystemConnectedDevices does not take into account the 'services' parameter on Android.");
}
//add dualMode type too as they are BLE too ;)
var connectedDevices = _bluetoothManager.GetConnectedDevices(ProfileType.Gatt).Where(d => d.Type == BluetoothDeviceType.Le || d.Type == BluetoothDeviceType.Dual);
var bondedDevices = _bluetoothAdapter.BondedDevices.Where(d => d.Type == BluetoothDeviceType.Le || d.Type == BluetoothDeviceType.Dual);
return(connectedDevices.Union(bondedDevices, new DeviceComparer()).Select(d => new Device(this, d, null, 0)).Cast <Device>().ToList());
}
protected void StopScanNative()
{
if (Build.VERSION.SdkInt < BuildVersionCodes.Lollipop)
{
Trace.Message("Adapter < 21: Stopping the scan for devices.");
#pragma warning disable 618
_bluetoothAdapter.StopLeScan(_api18ScanCallback);
#pragma warning restore 618
}
else
{
Trace.Message("Adapter >= 21: Stopping the scan for devices.");
_bluetoothAdapter.BluetoothLeScanner?.StopScan(_api21ScanCallback);
}
}
/// <summary>
/// This method is only called by a user triggered disconnect.
/// A user will first trigger _gatt.disconnect -> which in turn will trigger _gatt.Close() via the gattCallback
/// </summary>
internal void Disconnect()
{
if (_gatt != null)
{
IsOperationRequested = true;
ClearServices();
_gatt.Disconnect();
}
else
{
Trace.Message("[Warning]: Can't disconnect {0}. Gatt is null.", Name);
}
}
private void StartScanningNew(Guid[] serviceUuids)
{
var hasFilter = serviceUuids?.Any() ?? false;
List <ScanFilter> scanFilters = null;
if (hasFilter)
{
scanFilters = new List <ScanFilter>();
foreach (var serviceUuid in serviceUuids)
{
var sfb = new ScanFilter.Builder();
sfb.SetServiceUuid(ParcelUuid.FromString(serviceUuid.ToString()));
scanFilters.Add(sfb.Build());
}
}
var ssb = new ScanSettings.Builder();
ssb.SetScanMode(ScanMode.ToNative());
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
// enable Bluetooth 5 Advertisement Extensions on Android 8.0 and above
ssb.SetLegacy(false);
}
//ssb.SetCallbackType(ScanCallbackType.AllMatches);
if (_bluetoothAdapter.BluetoothLeScanner != null)
{
Trace.Message($"Adapter >=21: Starting a scan for devices. ScanMode: {ScanMode}");
if (hasFilter)
{
Trace.Message($"ScanFilters: {string.Join(", ", serviceUuids)}");
}
_bluetoothAdapter.BluetoothLeScanner.StartScan(scanFilters, ssb.Build(), _api21ScanCallback);
}
else
{
Trace.Message("Adapter >= 21: Scan failed. Bluetooth is probably off");
}
}
private async Task <int> RequestMtuNativeAsync(int requestValue)
{
if (_gatt == null || _gattCallback == null)
{
Trace.Message("You can't request a MTU for disconnected devices. Device is {0}", State);
return(-1);
}
if (Build.VERSION.SdkInt < BuildVersionCodes.Lollipop)
{
Trace.Message($"Request MTU not supported in this Android API level");
return(-1);
}
return(await TaskBuilder.FromEvent <int, EventHandler <MtuRequestCallbackEventArgs>, EventHandler>(
execute : () => { _gatt.RequestMtu(requestValue); },
getCompleteHandler : (complete, reject) => ((sender, args) =>
{
if (args.Error != null)
{
Trace.Message($"Failed to request MTU ({requestValue}) for device {Id}-{Name}. {args.Error.Message}");
reject(new Exception($"Request MTU error: {args.Error.Message}"));
}
else
{
complete(args.Mtu);
}
}),
subscribeComplete : handler => _gattCallback.MtuRequested += handler,
unsubscribeComplete : handler => _gattCallback.MtuRequested -= handler,
getRejectHandler : reject => ((sender, args) =>
{
reject(new Exception($"Device {Name} disconnected while requesting MTU."));
}),
subscribeReject : handler => _gattCallback.ConnectionInterrupted += handler,
unsubscribeReject : handler => _gattCallback.ConnectionInterrupted -= handler
));
}
public override void OnScanFailed(ScanFailure errorCode)
{
Trace.Message("Adapter: Scan failed with code {0}", errorCode);
base.OnScanFailed(errorCode);
}
public void OnLeScan(BluetoothDevice bleDevice, int rssi, byte[] scanRecord)
{
Trace.Message("Adapter.LeScanCallback: " + bleDevice.Name);
_adapter.HandleDiscoveredDevice(new Device(_adapter, bleDevice, null, rssi, scanRecord));
}
private static List <AdvertisementRecord> ParseScanRecord(byte[] scanRecord)
{
var records = new List <AdvertisementRecord>();
if (scanRecord == null)
{
return(records);
}
int index = 0;
while (index < scanRecord.Length)
{
byte length = scanRecord[index++];
//Done once we run out of records
// 1 byte for type and length-1 bytes for data
if (length == 0)
{
break;
}
int type = scanRecord[index];
//Done if our record isn't a valid type
if (type == 0)
{
break;
}
if (!Enum.IsDefined(typeof(AdvertisementRecordType), type))
{
Trace.Message("Advertisment record type not defined: {0}", type);
break;
}
//data length is length -1 because type takes the first byte
byte[] data = new byte[length - 1];
Array.Copy(scanRecord, index + 1, data, 0, length - 1);
// don't forget that data is little endian so reverse
// Supplement to Bluetooth Core Specification 1
// NOTE: all relevant devices are already little endian, so this is not necessary for any type except UUIDs
//var record = new AdvertisementRecord((AdvertisementRecordType)type, data.Reverse().ToArray());
switch ((AdvertisementRecordType)type)
{
case AdvertisementRecordType.ServiceDataUuid32Bit:
case AdvertisementRecordType.SsUuids128Bit:
case AdvertisementRecordType.SsUuids16Bit:
case AdvertisementRecordType.SsUuids32Bit:
case AdvertisementRecordType.UuidCom32Bit:
case AdvertisementRecordType.UuidsComplete128Bit:
case AdvertisementRecordType.UuidsComplete16Bit:
case AdvertisementRecordType.UuidsIncomple16Bit:
case AdvertisementRecordType.UuidsIncomplete128Bit:
Array.Reverse(data);
break;
}
var record = new AdvertisementRecord((AdvertisementRecordType)type, data);
Trace.Message(record.ToString());
records.Add(record);
//Advance
index += length;
}
return(records);
}