@ConnectionState
	public final int getConnectionState() {
		return requestHandler.getConnectionState();
	}
Method returns the connection state:
{@link BluetoothGatt#STATE_CONNECTING STATE_CONNECTING},
{@link BluetoothGatt#STATE_CONNECTED STATE_CONNECTED},
{@link BluetoothGatt#STATE_DISCONNECTING STATE_DISCONNECTING},
{@link BluetoothGatt#STATE_DISCONNECTED STATE_DISCONNECTED}

@return The connection state.
ble/src/main/java/no/nordicsemi/android/ble/BleManager.java