ANCS service migration

RE: ANCS service migration

Vidar Berg — Thu, 19 Dec 2019 07:45:45 GMT

Hi,

The only drawback is that you will need to perform service discovery on every connection even if the attribute table didn't change. So it adds a bit of overhead. But you don't need to store attribute handles to flash if you're doing the DB discovery anyway. Then you can just disable attribute caching.

RE: ANCS service migration

skulkarni — Wed, 18 Dec 2019 11:31:42 GMT

Hi Vidar,

I was storing the ANCS handles into persistent memory but when connecting to the previously bonded device instead of reading from the flash I was again trying to get the handles by starting the DB discovery. Now I have removed the code to store the ANCS handles in the persistent memory.

After this changes I am not seeing reconnect issue after connecting to previously bonded device.

I would like to understand the side effects of storing the handles in the persistent memory and doing the DB discovery again for the bonded device.

RE: ANCS service migration

Vidar Berg — Mon, 16 Dec 2019 17:49:58 GMT

Hi,

I haven't been able to replicate the disconnect here. I'm testing with an iphone 8 running iOS 13.3. Could you try to update iOS if you're not on the latest version already? I don't think the "unacceptable connection parameters" response you got earlier was valid because the packet was malformed. Also, is it only missed calls that lead to disconnects, or do you see the same if you send a text message?

RE: ANCS service migration

skulkarni — Mon, 16 Dec 2019 09:09:57 GMT

devzone.nordicsemi.com/.../ANCS_5F00_Terminate_5F00_User_5F00_connection.pcapng

Hi Vidar,

After repairing Iphone sends terminate connection after some time.

Please let me know if you get a chance a look into this issue.

I could see from the slave(NRF52832) when ever connection parameter update request sent Iphone sending terminate signal.. devzone.nordicsemi.com/.../ANCS_5F00_Conn_5F00_param_5F00_update.pcapng

RE: ANCS service migration

Vidar Berg — Fri, 13 Dec 2019 14:07:02 GMT

Thanks for providing a sniffer trace. I will take a look at it and also see if I can replicate the issue here. In the meantime, please make sure you're following the connection parameter recommendations given in section 25.6 of the Accessory Design guidelines document: https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf

Regards,

Vidar

RE: ANCS service migration

skulkarni — Fri, 13 Dec 2019 13:54:27 GMT

devzone.nordicsemi.com/.../6330.ANCS_5F00_Issue.pcapng

Hi Today I was able to take the sniffer log. I could see Terminate event from Iphone stating unacceptable connection parameters. Please let me know why I am receiving this event.

Thanks,

Kulkarni

RE: ANCS service migration

skulkarni — Thu, 12 Dec 2019 13:20:18 GMT

We have Android app also for which I didn't observe this behavior.

My NRF sniffer [using the DK-NRF52832 board] works for android phone but for IPhone I am not able to capture the Airtrace.