Bluetooth Stack

This layer manages the state of the connection. It controls advertising (broadcasting presence to other devices), scanning (looking for advertisers), and creating/maintaining connections. It handles the low-level timing and frequency hopping, which ensures Bluetooth is resistant to interference from Wi-Fi or microwaves.

At the very top of the stack sit the . Profiles are essentially standard rules that dictate how different applications should use the stack. They ensure interoperability so that a Sony speaker works with a Samsung phone. bluetooth stack

: The official Linux Bluetooth stack used in most distributions and Raspberry Pi systems. This layer manages the state of the connection

That night, Lena wrote in her lab notebook: “The Bluetooth stack is fragile because it’s a stack. But it’s also powerful for the same reason. Fix one brick, and the whole tower stands again.” At the very top of the stack sit the

: Allows devices to query what services (like "Headset" or "File Transfer") another device supports. Common Implementations