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Bluetooth™: Connect Without Cables by Charles F. Sturman, Jennifer Bray

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7 The Link Manager

The host drives a Bluetooth device through Host Controller Interface (HCI) commands, but it is the Link Manager (LM) that translates those commands into operations at the baseband level, managing the following operations.

  • Attaching Slaves to a piconet and allocating their active member addresses.
  • Breaking connections to detach Slaves from a piconet.
  • Configuring the link including controlling Master/Slave switches (where both devices must simultaneously change roles).
  • Establishing ACL (data) and SCO (voice) links.
  • Putting connections into low-power modes: Hold, Sniff, and Park.
  • Controlling test modes.

A Bluetooth Link Manager communicates with Link Managers on other Bluetooth devices using the Link Management Protocol (LMP). ...

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