Request for sample: nRF54L15 dynamic switching from ESB to BLE SMP (DFU) with timeout logic

[mi pingjie]

Environment:

• Chip: nRF54L15

• SDK Version: nRF Connect SDK (NCS) v3.1.1

• Board: nRF54L15 DK / Custom Board

Description: Hi Nordic Team,

I am developing a low-latency application on the nRF54L15 using the ESB (Enhanced ShockBurst) protocol as the default running mode. I need to implement a mechanism to switch to BLE mode specifically for firmware updates (DFU/FOTA) and then return to ESB if no connection is established.

My desired workflow is as follows:

1. Default State: The device runs proprietary ESB logic.

2. Trigger: Upon a specific Button Press (GPIO interrupt), the device should suspend/uninitialize the ESB subsystem.

3. Action: Initialize the BLE stack and start advertising with the SMP Service (Console/DFU).

4. Timeout Logic: If no BLE Central connects within 30 seconds, the device should stop BLE advertising, disable the Bluetooth stack, and re-initialize/resume the ESB functionality.

My Questions: Since the nRF54L15 is a new platform, could you please provide a reference sample or code snippets demonstrating:

1. How to cleanly de-initialize ESB and initialize BLE (and vice versa) in the same runtime context without triggering a full system reset?

2. How to properly manage the shared radio resources to avoid conflicts during this switch?

3. Is there an existing sample in the NCS that combines esb_ptx (or prx) with the smp_svr (SMP Server) that I can modify?

Any guidance on the recommended architectural approach for this "dual-mode but exclusive" operation on the nRF54L15 would be greatly appreciated.

Thanks.

[Vidar Berg]

Hello,

Please have a look at the Single-slot DFU sample here: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/dfu/single_slot/README.html. It seems like it may suit your requirements.

Best regards,

Vidar