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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>