Confusion : To use L2CAP vs GATT for max throughput with iOS.

RE: Confusion : To use L2CAP vs GATT for max throughput with iOS.

rishi — Thu, 13 Aug 2020 22:18:03 GMT

HI armz,

Using GATT i was able to achieve around 65KB per sec between nRF52840 and iOS 10 and + devices.

This was OK for me for my current application so i didn't tried L2CAP but i still wonder if somebody tries it to see what difference it can make if any.

Thanks, Rishi

RE: Confusion : To use L2CAP vs GATT for max throughput with iOS.

armz12 — Thu, 13 Aug 2020 04:59:06 GMT

Hi rishi,

We're trying to achieve the same thing and are equally confused. What throughput were you able to achieve using GATT between the nRF52840 and iOS?

RE: Confusion : To use L2CAP vs GATT for max throughput with iOS.

rishi — Wed, 06 May 2020 01:50:58 GMT

Hi Einar,

Thanks, i guess will start with ble uart example and see what best i can get, then after reaching this stage can decide further. Anyways thanks a lot for clearing up my confusion.

RE: Confusion : To use L2CAP vs GATT for max throughput with iOS.

Einar Thorsrud — Tue, 05 May 2020 14:23:40 GMT

Hi,

I don't see that you get significantly higher bandwidth using L2CAP directly rather than GATT (which is on top of L2CAP). With iOS and other mobile devices there will always be many factors that affect the actual throughput, but to have a baseline, you can get up to ~700 kbps using the 1 Mbps PHY and GATT between two nRF devices (use the throughput example in the SDK to see it demonstrated).

There are a few use cases for L2CAP connected oriented channels, particularly object transfer service, but unless you have a specific need for that I suggest you look at doing things the "normal" way with GATT first.

Regarding examples, there are examples of L2CAP connected oriented channels in the SDK (6LoWPAN examples and object transfer service).