https://devzone.nordicsemi.com/f/nordic-q-a/99663/questions-regarding-ble-service-and-characteristics-in-ncs-2-2-0Hi I have created a service and a few characteristics under it in one file using BT_GATT_SERVICE_DEFINE(my_service, BT_GATT_PRIMARY_SERVICE(&amp;my_service_uuid), BT_GATT_CHARACTERISTIC(&amp;my_char_uuid, BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY), BT_GATT_CCCen-USTelligent Community 13Fri, 12 May 2023 14:32:38 GMThttps://devzone.nordicsemi.com/thread/425390?ContentTypeID=1Fri, 12 May 2023 14:32:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41794f98-5a78-4aea-89cd-6a4cb6517ba2tesc<p>Hi,</p> [quote user=""]Is there any possible ways to do so,[/quote] <p>No, you cannot split a macro invocation over multiple files. Everything within the parentheses must be in the same file.</p> [quote user=""]<span><span>what is this&nbsp; &quot;</span></span>BT_GATT_SERVICE_INSTANCE_DEFINE&quot; used for and how?[/quote] <p>It can be used if you need multiple instances of the same service.</p> <p>I highly recommend having a look at the <a href="https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/">Bluetooth Low Energy Fundamentals</a> course on DevAcademy, and in particular <a href="https://academy.nordicsemi.com/lessons/lesson-4-bluetooth-le-data-exchange/">Lesson 4 - Data exchange in Bluetooth LE</a> which covers what is needed for setting up a service with two characteristics.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>