connectless CTE TX/RX problem

[loquat]

I am testing connectless CTE RX/TX.
A strange behavior is occurring.
Please advice me.

・connectless CTE TX
     nRF52833-DK + nRF Connect SDK + connectless CTE TX (almost same as sample)
・connectless CTE RX
   nRF52833-DK + nRF Connect SDK + My Application (customised connectless CTE RX)
   Scan doesn't stop after sync_create().

1. CTE is received normally for several tens of minutes.
2. Suddenly reception on the connectless CTE RX side stops. (stop scan)
3. If you start advertising while reception is stopped, you will be able to receive it.
4. When advertising stops, reception also stops. (stop scan)
5. If the connectless CTE TX is operating (transmitting) while advertising is running, reception will not stop even if advertising stops.

Is there anything we can investigate?

[Simonr]

Hi

I just wanted to let you know that I'm back, and I checked up on Hieu's test setup which has been running over the weekend and can confirm it is still running. So it seems like the fix is a success as far as we can tell. I'll let you know if anything changes.

Best regards,

Simon

[loquat]

An interesting phenomenon has occurred.
The phenomenon occurred in an environment I built into my product.
Similar to the test, you will receive a CTE.
nRF5340
Set CONFIG_BT_PER_ADV_SYNC_MAX=8
5 TX boards(with CTE)
If you are receiving for a long time, only EXT_ADV will not be received. (ADV_NON_CONN and ADV_CONN are received.)

Do you have any advice?

[Simonr]

So you're trying to receive CTE data from 5 TX devices at the same time? If so, that makes sense, as CTE means Constant tone extension, so it will only be able to receive from one device at a time by default, and you'll need to give each of them separate timeslots using I.E. the MPSL I believe. Are you able to receive the EXT_ADV at all? What exactly is "long time" in this test case?

Best regards,

Simon