nRF_connect_config.xml

<server-configuration name="Sample App">
   <service configure="CURRENT_TIME"/>
   <service configure="LINK_LOSS"/>
   <service configure="HEART_RATE"/>
   <service name="Light Switch" uuid="11111111-2222-3333-4444-555555555555">
      <characteristic name="Enabled" uuid="aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee" value="00">
         <permission name="READ"/>
         <permission name="WRITE"/>
         <property name="READ"/>
         <property name="WRITE"/>
      </characteristic>
   </service>
</server-configuration>