readonly attribute [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#BluetoothConnectionState|BluetoothConnectionState]] [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#connectionState|connectionState]];
attribute EventHandler [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#onservicechanged|onservicechanged]]; attribute EventHandler [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#oncharacteristicchanged|oncharacteristicchanged]]; attribute EventHandler [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#onconnectionstatechanged|onconnectionstatechanged]];
[NewObject, Throws] Promise<> [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#connect.28.29|connect()]];