ATT assertion fail when subscribing to characteristic using nRF9160 as central

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Fredrik — Wed, 05 Feb 2020 12:41:03 GMT

The Zephyr ATT was apparently rewritten a while ago, and it seems the changes made it into fw-nrfconnect-nrf v1.2.0-rc1 released just now. With the new changes, this issue has vanished!

I can finally close this thread 🙂

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Simon — Thu, 09 Jan 2020 11:09:38 GMT

That sound like a good idea👍

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Fredrik — Thu, 09 Jan 2020 10:40:50 GMT

Alright, thanks. I'll ask on the zephyr slack again and post here if the problem is resolved.

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Simon — Wed, 08 Jan 2020 14:58:23 GMT

I took a look at and tested your code, and was not able to get to the bottom of it, unfortunately. I think you will get better help on the Zephyr slack channel since you will get in touch with the developers that have written the BLE software.

We don't give support for Zephyr running on nRF52 at the moment, and I am sorry for not telling you this earlier.

Best regards,

Simon

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Fredrik — Sun, 05 Jan 2020 17:50:29 GMT

Hi Simon,

I'm attaching an altered version of my nRF9160 code that works with the HRS example from nRF SDK v15.2 on PCA10040. If you look in the file "project_stripped/src/ble.c", I've declared a boolean called "do_discover". When set to true, the nRF9160 performs service discovery and then subscribes to hard-coded ccc_handle and value_handle (which match the handles I'm getting on my PCA10040). This should work on your end as well. When "do_discover" is false, the nRF9160 tries to subscribe inside the connected callback and fails the assertion.

Flashing a PCA10040 with the HRS sample code from SDK v15.2 and running the attached code on an nRF9160 should work, however you may need to change the hard-coded values for it to work on your end. Also, I'm using west directly on Ubuntu 18.04 for building and flashing (no SES project unfortunately), but hopefully that's not an issue.

Thanks for your help!

devzone.nordicsemi.com/.../4628.project_5F00_stripped.zip

RE: ATT assertion fail when subscribing to characteristic using nRF9160 as central

Simon — Mon, 23 Dec 2019 13:35:02 GMT

Could you upload the code? Then I can try to reproduce the issue and get to the bottom of it. I can make the ticket private if you would like to?

You may experience delayed answers since huge parts of the support team are on vacation. Most of the staff will be back 2 of January, and you'll get help then.

Best regards,

Simon