I modified the nRF5 SDK 15.1 example program serial to display a message on a physical device. I added a blinky service to the ble_app_template example program and I am able to connect with the Nordic Blinky App and toggle a LED. What do I need to consider when I want to merge the two programs into one, that a connected device displays a message and at the same time you are able to connect via Blinky App and toggle a LED?