public Builder addConnectedPeripheral(@NonNull RxBleDevice rxBleDevice) {
            connectedPeripherals.add(rxBleDevice);
            return this;
        }
Add a {@link RxBleDevice} to the list of connected devices.

@param rxBleDevice device that the mocked client should contain. Use {@link RxBleDeviceMock.Builder} to create them.
mockrxandroidble/src/main/java/com/polidea/rxandroidble2/mockrxandroidble/RxBleClientMock.java