Introduction

The Link Manager is responsible for controlling the Baseband and maintain physical and logical connections to other devices. In the protocol stack the Link Manager is just above the Baseband and the two are very closely tied. The Host Controller Interface is the interface to control the Link Manager and is also used to send data through once a connection has been set up. The Host Controller Interface defines methods to inquire for other Bluetooth devices, connecting and disconnecting, accept or reject requests for connections, asking for the supported feature of the remote device, etc. It communicates in the other direction with the upper layer through a system of event messages. In our implementation of the protocol stack, the Host Controller Interface is used by the L2CAP layer, which is implemented by Benjamin Hanney, and all decisions for the interface between the two has been discussed with him. Furthermore the last stage of implementation, testing and bug fixing has been done by the two of us in cooperation.