https://devzone.nordicsemi.com/f/nordic-q-a/127169/smp-dfu-service-enabling-disabling---can-i-set-the-default-in-kconfignRF54L10 + NCS 3.02 A simple question: So I found CONFIG_MCUMGR_TRANSPORT_BT_DYNAMIC_SVC_REGISTRATION=y which lets me enable/disable the SMP service. Is there another config to make the default disabled, or do I need to call smp_bt_unregister() on startupen-USTelligent Community 13Wed, 25 Feb 2026 13:47:20 GMThttps://devzone.nordicsemi.com/thread/562049?ContentTypeID=1Wed, 25 Feb 2026 13:47:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2fe66a0-842b-4d73-beb1-86e35f746085Nick_RA<p>OK thanks. Caching isn&#39;t an issue here as the actual DFU will probably be done using nRF Connect once we enable it using our own config app or CLI.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/562033?ContentTypeID=1Wed, 25 Feb 2026 12:30:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2b6991b-069f-4f7c-a235-ae2cab95cba6Vidar Berg<p>Hello,</p> <p>To remove the service, you will need to call smp_bt_unregister() on startup before starting the advertiser since it is added unconditionally by the BT transport here:&nbsp;<a href="https://github.com/nrfconnect/sdk-zephyr/blob/baf177647fc40c5b87d35b24f13b5e4174bd7de3/subsys/mgmt/mcumgr/transport/src/smp_bt.c#L676">https://github.com/nrfconnect/sdk-zephyr/blob/baf177647fc40c5b87d35b24f13b5e4174bd7de3/subsys/mgmt/mcumgr/transport/src/smp_bt.c#L676</a>. And as you may know, when adding/removing services from the attribute table, it is important to consider potential issues related to attribute caching&nbsp;(<a href="https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-54/out/en/host/generic-attribute-profile--gatt-.html#UUID-542d3f08-c238-c464-d662-b3982828e5bc">2.5.2. Attribute caching</a>). The DFU client must do a new service discovery after the service is registered.&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>