@Override
    public String toString() {
        return "RxBleDeviceImpl{" + "bluetoothDevice=" + name + '(' + macAddress + ')' + '}';
    }
Set a BLE connection mock. Calling this method is required.
mockrxandroidble/src/main/java/com/polidea/rxandroidble2/mockrxandroidble/RxBleDeviceMock.java