Need some help getting faster sending rates with the NRF8001 and Arduino Library. Running out of credits.

RE: Need some help getting faster sending rates with the NRF8001 and Arduino Library. Running out of credits.

awneil — Thu, 08 Oct 2020 16:06:28 GMT

[quote userid="94090" url="~/f/nordic-q-a/66850/need-some-help-getting-faster-sending-rates-with-the-nrf8001-and-arduino-library-running-out-of-credits/273597#273597"]My connection interval is set to 7.5ms min and max[/quote]

That's what your peripheral requests - you need to find out what your Central is actually granting.

If it's a phone, it is unlikely to be giving you 7.5ms.

RE: Need some help getting faster sending rates with the NRF8001 and Arduino Library. Running out of credits.

Kenneth — Thu, 08 Oct 2020 11:48:46 GMT

For new development we recommend the nRF52-series, the nRF52 have much higher throughput since it can support Data Length Extension (255bytes instead of 20bytes). Also more packets can be sent in each connection event. Also check out this link that affect the nRF8001: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/what-impact-does-the-deprecation-and-withdrawal-of-bluetooth-core-specification-v4-0-and-v4-1-have-on-your-current-and-future-products

RE: Need some help getting faster sending rates with the NRF8001 and Arduino Library. Running out of credits.

polishdude20 — Wed, 07 Oct 2020 22:57:15 GMT

My connection interval is set to 7.5ms min and max. Judging by the fact that the NRF8001 can send 20 bytes per connection interval, I expect it to be ready to send data at least every 10 ms which would be perfect for my needs. But when I have a delay of 10ms between send calls, I still get an error about there not being enough credits yet.

RE: Need some help getting faster sending rates with the NRF8001 and Arduino Library. Running out of credits.

awneil — Wed, 07 Oct 2020 22:38:36 GMT

[quote userid="94090" url="~/f/nordic-q-a/66850/need-some-help-getting-faster-sending-rates-with-the-nrf8001-and-arduino-library-running-out-of-credits"]very quickly[/quote]

How quickly is "very" ?

In the 'examples' folder, there's a 'ble_bandwidth_test' - have you tried that?

Remember that BLE was never designed as a high-speed link, and the nRF8001 is a very old device - so doesn't benefit from more recent updates.

What are your link settings - connection interval, etc ?

EDIT

Note that what you're looking at is a port of Nordic's code; the original is here:

https://github.com/NordicSemiconductor/ble-sdk-arduino

You'd have to contact the authors/maintainers of the code you're using for specific details of how that code might be optimised