I am inspecting the Bluetooth HCI snoop logs as part of debugging an application. For dissecting the logs/Bluetooth LE packets I'm using Wireshark.
I found that there is a recurring unknown command in my Bluetooth LE logs, right before setting scan parameters and after generating advertisement reports. The command is being sent from the host to the controller. The host is a Samsung Galaxy S5, and the controller chip is a Broadcom BCM4354 MIMO.
The unknown code is "0xfd57"
The controller answers with a command complete packet. I have tried to look for events that induce this command but I've yet to find any; I cannot manually trigger it.
Below are screenshots depicting the unknown code:
Does anyone know any approaches to finding out more about this command? Or has anyone encountered such a command before?