throughput issues with a simple notification on MAC/Iphone

RE: throughput issues with a simple notification on MAC/Iphone

Vidar Berg — Fri, 28 Feb 2025 10:13:31 GMT

Hi,

Yes, ~600 kbps matches the max. data rate I've been able to get with iPhones. Some Android phones will let you get closer to the theoretical max. (have gotten around 1200 kbps).

RE: throughput issues with a simple notification on MAC/Iphone

klaus1234 — Fri, 28 Feb 2025 09:48:19 GMT

I got your example running. I get a throughput of about 600 kbps, which is similar to what I see in your screenshot above.

I ported your prj.conf settings to my project and there I have a proper bandwidth as well.

But: Since my device and the Phone are close close to each other I would have expected to see some thing close to 700 kbps(1M phy) or 1.4 mbps (2M phy).

Any exaplanation?

RE: throughput issues with a simple notification on MAC/Iphone

Vidar Berg — Wed, 19 Feb 2025 15:26:28 GMT

Hi,

From the sniffer captures it appears that the transfer rate is pretty high in both cases, but it is difficult to see the exact transfer speed in wireshark. Please try the project below and see if you get similar results. This sample uses a timer instance to monitor the throughput locally. To test it, just connect to it with a central device, enable notifications, then press button 1 on the board to start the test.

The throughput will vary between different centrals. I haven't tested throughut with macOS, but I've seen that iOS caps the data rate by limiting the connection event lengths.

devzone.nordicsemi.com/.../throughput_5F00_test.zip

Best regards,

Vidar