We have fixed an issue in the internal Bluetooth library that could cause a crash related to r_rwbtdm_isr_wrapper with 32768. Below is the updated Bluetooth library. Please follow the steps below to switch your project to use the new library:

Replace components/bt/controller/lib_esp32/esp32/libbtdm ...

We have fixed an issue in the internal Bluetooth library that could cause a crash related to `r_rwbtdm_isr_wrapper with 32768`. Below is the updated Bluetooth library. Please follow the steps to switch your project to use the new library:

1. Replace `components/bt/controller/lib_esp32/esp32/libbtdm ...

The crash that occurred in `r_rwbtdm_isr_wrapper` is a Bluetooth hardware error. Specifically, the number of `1`’s in the AFH channel map written by software does not match the value of `nb_good_chan` also written by software. By examining the ESP32 Bluetooth library, we found there might be a ...

I will try some testing with this sniff change. However, I think this sniff mode bug is a separate issue from the original SCO link problem... is that correct?

Regarding SCO link quality and retries:

This is a known issue which caused by that our hardware is not able to receive retransmitted ...

You can change to and test again. Please provide feedback on your test results, thank you very much!

Thanks for the note on hardware limitation esp-jc. A few follow-up questions:
Is there a workaround to the HW limitation that can improve audio quality?
Will there be a future update to the BT controller lib that will help?

I have some additional observations from testing that may be useful ...

BT_APPL: bta_ag_sco_read_cback: status(2)
This is a known issue which caused by that our hardware is not able to receive retransmitted sco packets from the peer device.