0986ab12e4
Reviewed by: M. Warner Losh <imp@bsdimp.com>; John Hay <jhay@freebsd.org> Approved by: M. Warner Losh <imp@bsdimp.com> (mentor)
113 lines
4.3 KiB
Groff
113 lines
4.3 KiB
Groff
.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: ng_bluetooth.4,v 1.3 2003/05/21 19:37:35 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd November 9, 2002
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.Dt NG_BLUETOOTH 4
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.Os
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.Sh NAME
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.Nm ng_bluetooth
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.Nd placeholder for global Bluetooth variables
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.Sh SYNOPSIS
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.In sys/types.h
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.In ng_bluetooth.h
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.Sh DESCRIPTION
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The
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.Nm
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module is a placeholder for global Bluetooth variables.
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All Bluetooth variables can be examined and changed via
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.Xr sysctl 8 .
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.Ss Bluetooth Variables
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Below is the description of default variables.
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Each Bluetooth module might add its own variables to the tree.
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.Bl -tag -width indent
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.It Va net.bluetooth.version
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A read-only integer variable that shows the current version of the
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Bluetooth stack.
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.It Va net.bluetooth.hci.command_timeout
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A read-write interger variable that controls the Host Controller Interface
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(HCI) command timeout (in seconds), i.e. how long the HCI layer will wait
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for the
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.Dv Command_Complete
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or
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.Dv Command_Status
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event from a Bluetooth device.
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.It Va net.bluetooth.hci.connection_timeout
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A read-write integer variable that controls the HCI connection timeout, i.e.\&
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how long the HCI layer will wait for the
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.Dv Connection_Complete
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event.
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Normally this should not be required as Bluetooth devices have
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connection timeout of their own and will send event back.
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This timeout
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is required to ensure that no connection will stall in case when the HCI
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transport layer is broken.
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Be careful when changing this variable.
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Make sure you understand what you are doing.
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.It Va net.bluetooth.hci.max_neighbor_age
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A read-write integer variable that controls time-to-live (in seconds) for
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entries in the HCI neighbor cache.
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Every time a Bluetooth device performs an
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.Dv Inquiry
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operation, the results will be put in cache.
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Later when a Bluetooth device
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establishes a baseband connection, it will try to find the matching entry in
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the cache and use it.
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This might speed up establishment of the baseband
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connection.
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.It Va net.bluetooth.l2cap.rtx_timeout
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A read-write integer variable that controls the Link Layer Control and
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Adaptation Protocol (L2CAP) Retransmission Timeout (RTX) (in seconds).
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Every time the L2CAP layer submits a control command, the RTX timeout is set.
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The value of the RTX timeout should be greater or equal to the value of
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the HCI connection timeout.
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Be careful when changing this variable.
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Make sure you understand what you are doing.
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.It Va net.bluetooth.l2cap.ertx_timeout
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A read-write integer variable that controls the L2CAP Extended Retransmission
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Timeout (ERTX) (in seconds).
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In some cases remote peer may respond with
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.Dv PENDING
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status to the L2CAP control command.
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In this case the L2CAP command timeout is reset to the ERTX timeout value.
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The value of the ERTX timeout should be
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greater or equal to the value of the RTX timeout.
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Be careful when changing this variable.
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Make sure you understand what you are doing.
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.El
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.Sh SEE ALSO
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.Xr ng_btsocket 4 ,
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.Xr ng_hci 4 ,
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.Xr ng_l2cap 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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module was implemented in
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.Fx 5.0 .
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com
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