RE: Could I dfu my nrf54l15 board through my nrf52820dongle board?

Edvin — Tue, 07 Jan 2025 11:27:05 GMT

Hello, and sorry for the late reply.

Unfortunately, we don't have anything doing exactly this.

We do however have two building blocks that can be used.

1: NCS\nrf\samples\bluetooth\central_smp_client

2: NCS\nrf\samples\cellular\lwm2m_client

The first one shows how to implement the client side of an smp server. SMP is the server that is used to upload the new application image.

The second one is an nRF91 sample that is capable of updating an nRF5x on the same board using UART (for mcuboot).

So basically, what you would need to do is to use the "update nRF5x device from nRF91 device, port it to run on the nRF52820 instead, and switch out the uart transport layer with BLE transport.

I am not sure of the flow in the lwm2m_client app. Not sure if it receives the application chunk wise, or if it downloads the entire image first. If it is the last, I don't think you would be able to fit the entire application for the nRF54L15 on the nRF52820, so you will have to figure out how to work around that.

Just out of curiosity, you say that you are using the "nrf52820dongle". We don't have an official nrf52820 dongle. What sort of device are you using? Do you have a part name for it? Or a picture?

Best regards,

Edvin