Data Length Update on nRF7002-DK

RE: Data Length Update on nRF7002-DK

Vidar Berg — Wed, 08 Oct 2025 12:46:54 GMT

The RADIO peripheral is only available to the network core, so any application that relies on the RADIO must have firmware running on the network core. In the case of Bluetooth, the bluetooth host typically runs on the application core, while the bluetooth controller resides on the network core (https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf53/features_nrf53.html#bluetooth_low_energy)

The throughput sample is for for the application core, but uses sysbuild (see https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-sysbuild/) to also include ipc_radio in the build. Both the app and network core will be programmed when you click "flash".

If you’re using our VS Code extension to build your project, you can see which projects are included in the build from the APPLICATIONS view.

RE: Data Length Update on nRF7002-DK

Ted Jones — Wed, 08 Oct 2025 12:32:39 GMT

Thanks Vidar. I appreciate your quick response but I am still a little confused. In the case of the throughput example is the entire code base being built for the network core? I am building my application for the application core, I am not sure what needs to be built/flashed to the network core. I will need to support both BLE and WiFi.

Thanks.

RE: Data Length Update on nRF7002-DK

Vidar Berg — Wed, 08 Oct 2025 11:59:56 GMT

Hello,

The radio packet length should be set to the maximum, which is 251 bytes. This allows the entire 247 byte ATT packet to fit into a single on-air packet. Support for the max. radio packet length (default:27) must be enabled in the ipc_radio FW running on the network core like how it's done in our BLE throughput sample here: https://github.com/nrfconnect/sdk-nrf/blob/main/samples/bluetooth/throughput/sysbuild/ipc_radio/prj.conf#L21-L23. CONFIG_BT_AUTO_DATA_LEN_UPDATE is also enabled by default, which means you to not have to initiate the update yourself.

Best regards,

Vidar

RE: Data Length Update on nRF7002-DK

Ted Jones — Tue, 07 Oct 2025 20:03:14 GMT

BTW, I tried initiating a data length update from nRF Connect as well, that had the same behavior.