Multiple connections with iso timer synchronization

RE: Multiple connections with iso timer synchronization

Elfving — Mon, 30 Sep 2024 09:13:26 GMT

Hello again,

[quote user="jvmreis"]I'm having difficulty implementing this part. I would like to know if the hardware or the SDK has any limitations that prevent this implementation.[/quote]

So synchronization with two different broadcasters isn't something the sample does by default. The stack and hardware does support this, but it isn't something the sample does, nor any of our other samples unfortunately. And getting the sample to do this does require a lot of changes.

Eg. https://github.com/nrfconnect/sdk-nrf/blob/main/samples/bluetooth/iso_time_sync/src/bis_receiver.c assumes that one goes through the steps to sync to one broadcaster only once. You would need to create two state machines to get this working.

I have talked to your local FAE about this, he will try to contact you this week.

Regards,

Elfving

RE: Multiple connections with iso timer synchronization

Elfving — Fri, 27 Sep 2024 13:19:34 GMT

Hi again,

I just had a talk with the team responsible, and the sample doesn't really support this by default. You would unfortunately have to change more than this to get it working. I will get more details for you on this next week.

Just to mention it, if you want this done in a more simple way you can also just send all the data on one channel.

Regards,

Elfving

RE: Multiple connections with iso timer synchronization

jvmreis — Tue, 24 Sep 2024 14:09:37 GMT

I changed the NCS version to 2.7.0 but it didn't work. The receiver code structure remains the same. My problem is that I want to activate two reception channels on the receiver so that each one can receive data from a sensor. However, from what I saw in the code, the receiver is limited to receiving only one channel. I'm having difficulty implementing this part. I would like to know if the hardware or the SDK has any limitations that prevent this implementation.

when I try to start two channels on the receiver, it only connects with the first index and the second index gives an initialization error

RE: Multiple connections with iso timer synchronization

Elfving — Thu, 19 Sep 2024 08:06:57 GMT

Could you try this with NCS 2.7.0 as well? The .99 part is what I am trying to avoid, just because of the chance that there is some bug in the main branches.

Regards,

Elfving

RE: Multiple connections with iso timer synchronization

jvmreis — Wed, 18 Sep 2024 19:18:02 GMT

i test with a Nordic SDK v2.7.99-cs1 and i had the same problem.

I saw this here in the .readme. The receiver only receives 1 transmitter even if the amount of CONFIG_BT_ISO_MAX_CHAN is increased? Why is there this limitation?

Besides this, are you seeing the sample otherwise working as it should regarding what is outlined here in the "Testing" part of the documentation?

Yes, I am following this documentation and the program works as described, however, I want to edit it so that a receiver can receive more than one transmitter.

RE: Multiple connections with iso timer synchronization

Elfving — Wed, 18 Sep 2024 09:27:01 GMT

Hi,

[quote user=""]

I am using the sample code from Nordic SDK v2.6.99-cs2 Bluetooth: ISO time synchronization.

[/quote]

Sorry for the cop-out answer from me here, but could you try the same thing with a tagged version of NCS? Release candidates and main-branch etc. could have issues, that can be annoying to debug in case the issue is allready solved in eg. 2.7, which is already released.

Besides this, are you seeing the sample otherwise working as it should regarding what is outlined here in the "Testing" part of the documentation?

Regards.

Elfving