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+.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $Id: ng_bluetooth.4,v 1.3 2003/05/21 19:37:35 max Exp $
+.\" $FreeBSD$
+.\"
+.Dd November 9, 2002
+.Dt NG_BLUETOOTH 4
+.Os
+.Sh NAME
+.Nm ng_bluetooth
+.Nd placeholder for global Bluetooth variables
+.Sh SYNOPSIS
+.In sys/types.h
+.In netgraph/bluetooth/include/ng_bluetooth.h
+.Sh DESCRIPTION
+The
+.Nm
+module is a placeholder for global Bluetooth variables.
+All Bluetooth variables can be examined and changed via
+.Xr sysctl 8 .
+.Ss Bluetooth Variables
+Below is the description of default variables.
+Each Bluetooth module might add its own variables to the tree.
+.Bl -tag -width foo
+.It Va net.bluetooth.version
+A read-only integer variable that shows the current version of the
+Bluetooth stack.
+.It Va 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
+.Dv Command_Complete
+or
+.Dv Command_Status
+event from a Bluetooth device.
+.It Va 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
+.Dv 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.
+.It Va 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
+.Dv 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.
+.It Va 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.
+.It Va 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
+.Dv 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.
+.El
+.Sh SEE ALSO
+.Xr ng_btsocket 4 ,
+.Xr ng_hci 4 ,
+.Xr ng_l2cap 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+module was implemented in
+.Fx 5.0 .
+.Sh AUTHORS
+.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com