ng_bluetooth(4)

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 Blue

tooth variables.
All Bluetooth variables can be examined and changed via

sysctl(8).

Bluetooth Variables

Below is the description of default variables. Each Blue

tooth 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 Com

mand_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 re

sults will be
put in cache. Later when a Bluetooth device estab

lishes 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 re

set 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 under

stand 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>

BSD November 9, 2002

BSD