Bluetooth OTA Speeds on NRF5 SDK vs Zephyr

[wilcockj]

I have been working on a project using a nrf52832 and currently have the firmware developed on nrf5sdk. I have been testing out Zephyr with this example https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/README.html for trying out OTA updating. I am getting about 20-24KB/s via the nordic device manager on my pixel 8. While on the nrf5sdk version I am getting around 7-8KB/s on the nordic dfu app, is this to be expected? Are there some config options I should look into on the nrf5sdk version to get closer to this speed?

Would love to hear if there are known benchmark speeds for nrf52832 or similar on OTA DFU speeds via BLE comparing nrf5sdk to the Zephyr performance.

[Menon]

Hello,

Sorry for misinterpreting the question you raised. I’m not very familiar with our old nRF5 SDK, but I will look into this. I am checking with the mobile apps team to see if this is the expected normal speed. Is this a custom application or one of the samples from the SDK? If it’s a custom application, are you able to see the same issue with any of the samples?

Kind regards,
Abhijith

[wilcockj]

Hello,
Yes that nRF5 SDK is built of the dfu secure bootloader ble example, with little to no modification. To be specific pca10056_s140_ble. We are using single bank updates.