L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

ERobotics — Tue, 17 Sep 2019 03:22:50 GMT

Hi Marco,

Can you share the project to check L2CAP functionality.

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

Marco — Mon, 24 Sep 2018 06:19:01 GMT

Hello Joe,

The project I was working on has been put on hold. I can't find any notes about my tests but I'm pretty sure I couldn't get to the 40 kB/s (about 400 kbps?) that were the requirement. My tests were done with an iPhone 6s and an iPad 5th gen. I can't tell what the maximum performance would be as I didn't fully investigate all the options to tune the configuration.

FYI, a couple of related points that you might want to consider:

At the time, Android support was a concern as the API for CoC seemed to only be available on latest OS versions.
Performance varies significantly depending on the iOS device

Sorry if this is not particularly helpful.

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

JoeBakalor — Sun, 23 Sep 2018 12:10:10 GMT

Hi Marco,

Have you done any throughput testing between iOS and the NRF52 using L2CAP CoC? Just curious. I was able to get around 600kbps with the 2M phy between iPhone X and NRF52 using notifications. Curious how much of an increase using L2CAP CoC might add

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

Marco — Wed, 25 Apr 2018 08:24:33 GMT

Hi Mttrinh,

I'm using S140 nRF52 6.0.0.

I've started the project from the ble_app_template sample project, which calls nrf_sdh_ble_default_cfg_set().
I thought that function would fully configure the stack as specified in sdk_config.h but now that you mentioned it I've checked and noticed it calls sd_ble_cfg_set() to configure various things but not L2CAP.
I've added the L2CAP configuration, with ch_count=1 as the default is 0, and now it works.

Thank you for pointing me in the right direction 🙂

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

Mttrinh — Wed, 25 Apr 2018 07:38:15 GMT

Hi,

Which softdevice are you using? and what is the L2CAP configuration? The parameters that you are using when calling sd_ble_cfg_set().

RE: L2CAP connection refused with BLE_L2CAP_CH_STATUS_CODE_NO_RESOURCES

Marco — Fri, 20 Apr 2018 13:10:12 GMT

Any Nordic engineer able to offer some hints? I've tried a few different configuration options but I'm stuck on this.