DFU and custom service doesnt work together

[Prasad]

I have included the DFU service and a custom service in my application. During initialisation DFU service is getting initialised and later down the line my custom service is getting initialised.
During initialisation of my custom service I am calling sd_ble_uuid_vs_add(), this call fails giving NRF_ERROR_NO_MEM.

Note that the failure happens only when I enable the DFU related code. The call is successful and things run perfectly fine when DFU related code is commented out from my application. Same is true vice versa; DFU works fine when custom service related code is removed.

Is there a limit on number of custom services that we can add in an application? Or does this sound like something else is wrong?

[Prasad]

When I changed vs_uuid_count=2 my application was failing. When I enabled logging and checked the logs, I found that softdevice_enable() was throwing messages and asking me to change the app_ram_base. So I shifted my application ram start address as suggested in the message given by softdevice_enable() .

[Rishi]

Okay. I have never encountered such behaviour, but it must be due to DFU code because vs_uuid_count is also responsible for shifting addresses. So, in order to accommodate DFU and 2 custom UUIDs, this change was necessary. Thanks for the insight.

[Hung Bui]

When you increase the number of base UUID, you need to increase the ram needed for the softdevice. The UUID database enlarged, softdevice needs more RAM for it.