How do you voluntarily switch between BLE NUS/DFU service?

[wknight92]

My question is while the application is running, how can I disable the NUS service to turn on the DFU service. This idea stems from this question: devzone.nordicsemi.com/.../

The accepted answer involves switching between the two services but there is no explanation of how this is done. I see in one of the comments there is something about setting NRF_POWER->GPREGRET = BOOTLOADER_DFU_START but there seems to be more to fixing the problem.

I would like to have the application start in NUS, and then switch over to DFU when it receives a command (via UART). Then after the DFU upload process happens, the device resumes default NUS mode.

Thank you.

[wknight92]

As it turns out, you can have both NUS and DFU services (two 128-bit UUID services) working simultaneously if you set [softdevice_handler.c line 388]p_ble_enable_params->common_enable_params.vs_uuid_count = 2. Solution was found by this answer: devzone.nordicsemi.com/.../

[wknight92]

You may have to increase your IRAM size (default 0x6100) to get your application to function.