This is not a problem, but more a question to understand more about BLE audio broadcasting, advertising and PAST.
Please correct me if I'm wrong :
My understanding is that a BLE Audio broadcaster sends advertising packets which can be received and processed by a scanner / receiver. The scanner / receiver first will get information from the primary advertising packets about how to read the secondary advertising packets (which channels, PHY etc.), which in turn explain how to get the periodic advertising packets. The receiver can then more efficiently read these periodic advertising packets as it knows from where, how and when they will be sent.
Now onto the actual audio packets being broadcasted by the broadcaster. Are these again on separate channels, and not part of the periodic advertising packets? I assume that they are separate, and that the periodic advertising data explain how to sync to them?
This leads me to PAST (Periodic Advertising Sync Transfer). As pictured below. This allows a device such as a Smartphone to scan on behalf of a resource-constrained receiver device, and then transfer all of the audio sync information to the receiver.
The receiver doesn't even need to scan for advertising packets? What's misleading from the picture below, is that the receiver still needs to receive the audio broadcast packets directly from the broadcast source. Is this correct? Or are the audio broadcast packets are not sent via PAST also?
Thanks in advance! Sorry for such a long post.
