NAME

     ng_bluetooth — placeholder for global Bluetooth variables

SYNOPSIS

     #include <sys/types.h>
     #include <netgraph/bluetooth/include/ng_bluetooth.h>

DESCRIPTION

     The ng_bluetooth module is a placeholder for global Bluetooth variables.  All Bluetooth
     variables can be examined and changed via sysctl(8).

   Bluetooth Variables
     Below is the description of default variables.  Each Bluetooth module might add its own
     variables to the tree.

     net.bluetooth.version
          A read-only integer variable that shows the current version of the Bluetooth stack.

     net.bluetooth.hci.command_timeout
          A read-write integer variable that controls the Host Controller Interface (HCI) command
          timeout (in seconds), i.e., how long the HCI layer will wait for the Command_Complete
          or Command_Status event from a Bluetooth device.

     net.bluetooth.hci.connection_timeout
          A read-write integer variable that controls the HCI connection timeout, i.e. how long
          the HCI layer will wait for the Connection_Complete event.  Normally this should not be
          required as Bluetooth devices have connection timeout of their own and will send event
          back.  This timeout is required to ensure that no connection will stall in case when
          the HCI transport layer is broken.  Be careful when changing this variable.  Make sure
          you understand what you are doing.

     net.bluetooth.hci.max_neighbor_age
          A read-write integer variable that controls time-to-live (in seconds) for entries in
          the HCI neighbor cache.  Every time a Bluetooth device performs an Inquiry operation,
          the results will be put in cache.  Later when a Bluetooth device establishes a baseband
          connection, it will try to find the matching entry in the cache and use it.  This might
          speed up establishment of the baseband connection.

     net.bluetooth.l2cap.rtx_timeout
          A read-write integer variable that controls the Link Layer Control and Adaptation
          Protocol (L2CAP) Retransmission Timeout (RTX) (in seconds).  Every time the L2CAP layer
          submits a control command, the RTX timeout is set.  The value of the RTX timeout should
          be greater or equal to the value of the HCI connection timeout.  Be careful when
          changing this variable.  Make sure you understand what you are doing.

     net.bluetooth.l2cap.ertx_timeout
          A read-write integer variable that controls the L2CAP Extended Retransmission Timeout
          (ERTX) (in seconds).  In some cases remote peer may respond with PENDING status to the
          L2CAP control command.  In this case the L2CAP command timeout is reset to the ERTX
          timeout value.  The value of the ERTX timeout should be greater or equal to the value
          of the RTX timeout.  Be careful when changing this variable.  Make sure you understand
          what you are doing.

SEE ALSO

     ng_btsocket(4), ng_hci(4), ng_l2cap(4), sysctl(8)

HISTORY

     The ng_bluetooth module was implemented in FreeBSD 5.0.

AUTHORS

     Maksim Yevmenkin <m_evmenkin@yahoo.com>