What is host and controller btsnoop_hci.log?

Question

Inside btnsnoop_hci.log file I am little confused about a host, controller, remote() and LocalHost(). I was digging on google to understand but unable to found the proper documentation which explains it. If you have any idea about btnsnoop_hei.log do share.

Answer 1

The host is the main cpu that runs a Bluetooth stack.

The controller is a separate chip that controls the low level Bluetooth radio.

These two devices (inside the phone) talk with each other usually over UART using the HCI protocol.

A remote controller is the Bluetooth chip in another device that communicates with the local controller over Bluetooth.