Hello all,
We are working with the CYW43340 on the Inventek ISM43340. I have the HCI interface up and running with my host and everything seems to work fine in that regard.
However, there is a strange problem where, during the connection process, the LMP layer seems to fail to respond causing an HCI TIMEOUT
I gathered some logs with the following test procedure:
1) Enable monitoring with btmon
2) Disable secure connections and simple secure pairing (this ensures the simplest pairing routine, however, the same problem happens either way)
3) Launch a pair operation with the Anker SoundCore2 Bluetooth speaker.
These logs reveal a failure to execute the “Pairing during connection Setup” outlined in Figure 3.10 from the Bluetooth Core 5.1 Spec Vol 2 part F Section 3.1 “Connection Setup”
I am able to execute the parts up until the 2nd HCI_Command_Complete confirms the HCI_PIN_Code_Request_Reply. After this, however, the controller stalls for 20 seconds before reporting Connection Timeout (Reason 0x08). After confirming that the default Link Supervisor Timeout is in fact 20 seconds, I began to suspect a problem in the LMP layer.
I gathered a log with my phone (a known working Pixel XL running Android 😎 to see if anything before the timeout looks different. This showed the same lead up to the aforementioned step in Figure 3.10 (right before LMP_in_rand) however, the pariing operation is completed successfully resulting in the HCI_Link_Key_Notification which establishes paired status.
The btsnoop_hci.cap file attached has an example of connecting to the Soundcore from my phone (packet No. 6485 – 6538)
The btmon.log file attached shows the same log from the Linux Host. However, where we should be getting the HCI_Link_Key_Notification – we wait 20 seconds and timeout.
This seems to me to be a link manager interaction problem – rather than a host-controller problem. Perhaps there’s a vendor specific command required by the BCM43341 to fix this issue?
Any help with this issue would be greatly appreciated.
