https://devzone.nordicsemi.com/f/nordic-q-a/26006/question-about-secondary-gatt-servicesI know it&#39;s not very common to use a secondary service, but I want to use it in one specific scenario. When referring to the documentation for the API sd_ble_gatts_include_add() , I see the following note: &quot;It is currently only possible to add an includeen-USTelligent Community 13Tue, 17 Oct 2017 12:46:17 GMThttps://devzone.nordicsemi.com/thread/102489?ContentTypeID=1Tue, 17 Oct 2017 12:46:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1007e51c-f5c2-4482-a531-83a04360b4aeMohammad Afaneh<p>Got it. Makes sense. Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/102488?ContentTypeID=1Tue, 17 Oct 2017 08:42:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8862be65-62ed-4566-b979-354d29a03531bjorn-spockeli<p>It means that it only possible to add the include declaration of the secondary service to the last service that was added using sd_ble_gatts_service_add().</p> <p>So if you want to add a secondary service to multiple services you will have to add the services and secondary services in the following order.</p> <pre><code>sd_ble_gatts_service_add(&lt;Service 1&gt;) sd_ble_gatts_include_add( Secondary Service) sd_ble_gatts_service_add(&lt;Service 2&gt;) sd_ble_gatts_include_add(Secondary Service) sd_ble_gatts_service_add(&lt;Service 3&gt;) sd_ble_gatts_include_add(Secondary Service) </code></pre><div style="clear:both;"></div>