public void BtGattDisconnect()
{
try
{
if (_gattCharacteristicSppRead != null)
{
try
{
_bluetoothGatt?.SetCharacteristicNotification(_gattCharacteristicSppRead, false);
}
catch (Exception)
{
// ignored
}
_gattCharacteristicSppRead = null;
}
_gattCharacteristicSppWrite = null;
_gattConnectionState = State.Disconnected;
_gattServicesDiscovered = false;
if (_bluetoothGatt != null)
{
try
{
_bluetoothGatt.Disconnect();
}
catch (Exception)
{
// ignored
}
_bluetoothGatt.Dispose();
_bluetoothGatt = null;
}
if (_btGattSppInStream != null)
{
_btGattSppInStream.Dispose();
_btGattSppInStream = null;
}
if (_btGattSppOutStream != null)
{
_btGattSppOutStream.Dispose();
_btGattSppOutStream = null;
}
}
catch (Exception)
{
// ignored
}
}
public bool ConnectLeGattDevice(Context context, BluetoothDevice device)
{
try
{
BtGattDisconnect();
_gattConnectionState = State.Connecting;
_gattServicesDiscovered = false;
_btGattSppInStream = new MemoryQueueBufferStream(true);
_btGattSppOutStream = new BGattOutputStream(this);
_bluetoothGatt = device.ConnectGatt(context, false, new BGattCallback(this));
if (_bluetoothGatt == null)
{
LogString("*** ConnectGatt failed");
return(false);
}
_btGattConnectEvent.WaitOne(2000, false);
if (_gattConnectionState != State.Connected)
{
LogString("*** GATT connection timeout");
return(false);
}
_btGattDiscoveredEvent.WaitOne(2000, false);
if (!_gattServicesDiscovered)
{
LogString("*** GATT service discovery timeout");
return(false);
}
IList <BluetoothGattService> services = _bluetoothGatt.Services;
if (services == null)
{
LogString("*** No GATT services found");
return(false);
}
#if DEBUG
foreach (BluetoothGattService gattService in services)
{
if (gattService.Uuid == null || gattService.Characteristics == null)
{
continue;
}
Android.Util.Log.Info(Tag, string.Format("GATT service: {0}", gattService.Uuid));
foreach (BluetoothGattCharacteristic gattCharacteristic in gattService.Characteristics)
{
if (gattCharacteristic.Uuid == null)
{
continue;
}
Android.Util.Log.Info(Tag, string.Format("GATT characteristic: {0}", gattCharacteristic.Uuid));
Android.Util.Log.Info(Tag, string.Format("GATT properties: {0}", gattCharacteristic.Properties));
}
}
#endif
_gattCharacteristicSppRead = null;
_gattCharacteristicSppWrite = null;
_gattCharacteristicUuidSppRead = null;
_gattCharacteristicUuidSppWrite = null;
BluetoothGattService gattServiceSpp = _bluetoothGatt.GetService(GattServiceCarlySpp);
BluetoothGattCharacteristic gattCharacteristicSpp = gattServiceSpp?.GetCharacteristic(GattCharacteristicCarlySpp);
if (gattCharacteristicSpp != null)
{
if ((gattCharacteristicSpp.Properties & (GattProperty.Read | GattProperty.Write | GattProperty.Notify)) ==
(GattProperty.Read | GattProperty.Write | GattProperty.Notify))
{
_gattCharacteristicSppRead = gattCharacteristicSpp;
_gattCharacteristicSppWrite = gattCharacteristicSpp;
_gattCharacteristicUuidSppRead = GattCharacteristicCarlySpp;
_gattCharacteristicUuidSppWrite = GattCharacteristicCarlySpp;
#if DEBUG
Android.Util.Log.Info(Tag, "SPP characteristic Carly found");
#endif
}
}
else
{
gattServiceSpp = _bluetoothGatt.GetService(GattServiceWgSoftSpp);
BluetoothGattCharacteristic gattCharacteristicSppRead = gattServiceSpp?.GetCharacteristic(GattCharacteristicWgSoftSppRead);
BluetoothGattCharacteristic gattCharacteristicSppWrite = gattServiceSpp?.GetCharacteristic(GattCharacteristicWgSoftSppWrite);
if (gattCharacteristicSppRead != null && gattCharacteristicSppWrite != null)
{
if (((gattCharacteristicSppRead.Properties & (GattProperty.Read | GattProperty.Notify)) == (GattProperty.Read | GattProperty.Notify)) &&
((gattCharacteristicSppWrite.Properties & (GattProperty.Write)) == (GattProperty.Write)))
{
_gattCharacteristicSppRead = gattCharacteristicSppRead;
_gattCharacteristicSppWrite = gattCharacteristicSppWrite;
_gattCharacteristicUuidSppRead = GattCharacteristicWgSoftSppRead;
_gattCharacteristicUuidSppWrite = GattCharacteristicWgSoftSppWrite;
}
#if DEBUG
Android.Util.Log.Info(Tag, "SPP characteristic WgSoft found");
#endif
}
}
if (_gattCharacteristicSppRead == null || _gattCharacteristicSppWrite == null)
{
LogString("*** No GATT SPP characteristic found");
return(false);
}
if (!_bluetoothGatt.SetCharacteristicNotification(_gattCharacteristicSppRead, true))
{
LogString("*** GATT SPP enable notification failed");
return(false);
}
BluetoothGattDescriptor descriptor = _gattCharacteristicSppRead.GetDescriptor(GattCharacteristicConfig);
if (descriptor == null)
{
LogString("*** GATT SPP config descriptor not found");
return(false);
}
if (BluetoothGattDescriptor.EnableNotificationValue == null)
{
LogString("*** GATT SPP EnableNotificationValue not present");
return(false);
}
_gattWriteStatus = GattStatus.Failure;
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
if (!_bluetoothGatt.WriteDescriptor(descriptor))
{
LogString("*** GATT SPP write config descriptor failed");
return(false);
}
if (!_btGattWriteEvent.WaitOne(2000))
{
LogString("*** GATT SPP write config descriptor timeout");
return(false);
}
if (_gattWriteStatus != GattStatus.Success)
{
LogString("*** GATT SPP write config descriptor status failure");
return(false);
}
#if false
byte[] sendData = Encoding.UTF8.GetBytes("ATI\r");
_btGattSppOutStream.Write(sendData, 0, sendData.Length);
while (_btGattReceivedEvent.WaitOne(2000, false))
{
#if DEBUG
Android.Util.Log.Info(Tag, "GATT SPP data received");
#endif
}
while (_btGattSppInStream.HasData())
{
int data = _btGattSppInStream.ReadByteAsync();
if (data < 0)
{
break;
}
#if DEBUG
Android.Util.Log.Info(Tag, string.Format("GATT SPP byte: {0:X02}", data));
#endif
}
#endif
return(true);
}
catch (Exception)
{
_gattConnectionState = State.Disconnected;
_gattServicesDiscovered = false;
return(false);
}
}
