How to increase throughput in nrf52-ble-image-transfer-demo project?

RE: How to increase throughput in nrf52-ble-image-transfer-demo project?

Sunil vignesh — Tue, 07 Jul 2020 16:10:27 GMT

how to achieve 1000 - 1400 kbps with same code

RE: How to increase throughput in nrf52-ble-image-transfer-demo project?

Sunil vignesh — Tue, 07 Jul 2020 16:09:22 GMT

Hi,

I have tried your code in nrf52832 sdk16.0

with Samsung A7 2017

RE: How to increase throughput in nrf52-ble-image-transfer-demo project?

Kirill_K — Fri, 26 Jun 2020 08:01:08 GMT

Yes, my results are significantly lower than yours (around 50-60 kbps). And it's similar to what i've got with image transfer demo. I'll send your example to my colleague to try with another phone.

upd: with other phones throughput is significantly higher. So, the problen is on the phone side and this is good news (partly...)

RE: How to increase throughput in nrf52-ble-image-transfer-demo project?

Vidar Berg — Fri, 26 Jun 2020 07:30:52 GMT

Hello,

It sounds like you are doing it correctly. Calling ble_its_string_send() in a loop until it stops returning NRF_SUCCESS will help make sure the Softdevice's output buffer gets fully utilized. I don't have a Xiaomi Redmi Note 4X to test with, but maybe the throughput is getting limited by the BT chipset on this phone.

I have made a simple example based on the ble_app_uart example in SDK 16 which attempts to send dummy data as fast as possible once the client enables notifications, see attached below. Please try this on your side and see if it gives you any better throughput.

devzone.nordicsemi.com/.../ble_5F00_app_5F00_uart_5F00_throughput_5F00_test.zip

Test result I got with a Google Pixel 2: