Channel Sounding RAS RREQ and RRSP at the same time

RE: Channel Sounding RAS RREQ and RRSP at the same time

Simonr — Tue, 27 May 2025 07:52:04 GMT

This does indeed seem feasible to me, what exactly are you missing in your application now, and are there further action points from our side? The warnings seem to refer to you trying to enable notifications but that not being enabled on the peer side. I don't think you need to implement notifications here.

Best regards,

Simon

RE: Channel Sounding RAS RREQ and RRSP at the same time

Bruno Randolf — Mon, 26 May 2025 12:04:44 GMT

Hi Simon! Yes, thank you! That fix helps to get the sample running. When I activate CONFIG_BT_RAS_RRSP_AUTO_ALLOC_INSTANCE=y I get some warnings, but it still works:

W: Peer is not subscribed to status characteristic.
W: Notify overwritten failed: -22

I assume that has to do with the GATT ranging roles you mentioned.

My use case is that I would like to be able to do CS between any two devices on demand, which means for one device the role is not fixed to initiator or reflector but it should be able to do both. I am not doing this in parallel or on the same link. It's more like device A could be initiator and then device B should be reflector. Or in an other moment B could be the initiator and A the reflector. Do you think that is feasible? It seems we are close...

RE: Channel Sounding RAS RREQ and RRSP at the same time

Simonr — Fri, 23 May 2025 06:10:03 GMT

If you add this fix to the sample, you should be able to get the samples to work with both RAS_RRSP and RAS_RREQ configs.

Best regards,

Simon

RE: Channel Sounding RAS RREQ and RRSP at the same time

Simonr — Thu, 22 May 2025 12:54:15 GMT

Hi Bruno

Hmm, okay. It seems like we need to take a step back here. What exactly is your use case here? Are you using just one device as both reflector and initiator on a single link at the same time? If so, that is outside of the Bluetooth specification and won't be possible. However, multilink configurations should be possible, and one device should be able to be initiator on one link and reflector on the other, but note that the ranging roles (GATT) are unrelated to this.

How many devices are you working with here, and what is the goal with channel sounding here?

Best regards,

Simon

RE: Channel Sounding RAS RREQ and RRSP at the same time

Bruno Randolf — Wed, 21 May 2025 11:24:54 GMT

CONFIG_MAIN_STACK_SIZE=8192 doesn't fix it, and no I didn't make any other changes to the sample.

RE: Channel Sounding RAS RREQ and RRSP at the same time

Simonr — Tue, 20 May 2025 12:33:27 GMT

Can you try increasing the CONFIG_MAIN_STACK_SIZE to make more room for the buffers, as the error seems to be due to the buffer not being large enough for the ranging operation to take place here. Also, do you not make any changes to the main file here, only add those two configs to reproduce the issue?

Best regards,

Simon

RE: Channel Sounding RAS RREQ and RRSP at the same time

Maria Gilje — Mon, 19 May 2025 10:14:25 GMT

Hello,

Our Channel Sounding expert is away today and will address this case when he is back (tomorrow or wednesday). Thank you for your patience.

Best regards,

Maria