SMP Server DFU very slow

RE: SMP Server DFU very slow

Kenneth — Tue, 12 Oct 2021 08:47:10 GMT

Looking at the traces I can see that much of the data is fragmented, this is because the peripheral have not enabled data length exentsion (DLE). Can you follow the project settings from the throughput example on how to enable DLE:
https://github.com/tejlmand/fw-nrfconnect-nrf/blob/master/samples/bluetooth/throughput/prj.conf

In addition I can see that the connection interval is about 48.75ms, if possible you should try to reduce the connection interval (e.g. 30ms) should speed thing up.

The implementation is different from the nRF5 SDK, so you can't get the same performance in terms of throughput, but hopefully the above should help some.

Hope that helps,
Kenneth

RE: SMP Server DFU very slow

fgeldenh — Tue, 12 Oct 2021 05:38:01 GMT

Hi - I have taken traces from IOS and Android nrfConnect for Mobile.

devzone.nordicsemi.com/.../androidcapture.pcapng devzone.nordicsemi.com/.../ioscapture.pcapng

RE: SMP Server DFU very slow

Kenneth — Mon, 11 Oct 2021 13:09:12 GMT

[quote userid="71851" url="~/f/nordic-q-a/80514/smp-server-dfu-very-slow"]Are there any suggestions as to how to improve the performance.[/quote]

Are you able to create an on air BLE sniffer log so we can theorize a bit what may improve throughput?
https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE (you need a spare nRF52/nRF52840-DK)
https://infocenter.nordicsemi.com/topic/ug_sniffer_ble/UG/sniffer_ble/intro.html (I suggest download the user guide in pdf)

Kenneth