SMP (DFU) service enabling/disabling - can I set the default in kconfig?

[Nick_RA]

nRF54L10 + 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 startup?

Thanks

[Vidar Berg]

Hello,

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: https://github.com/nrfconnect/sdk-zephyr/blob/baf177647fc40c5b87d35b24f13b5e4174bd7de3/subsys/mgmt/mcumgr/transport/src/smp_bt.c#L676. And as you may know, when adding/removing services from the attribute table, it is important to consider potential issues related to attribute caching (2.5.2. Attribute caching). The DFU client must do a new service discovery after the service is registered. 

Best regards,

Vidar

[Nick_RA]

OK thanks. Caching isn'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.