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+.\" ng_ubt.4
+.\" 
+.\" 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_ubt.4,v 1.2 2002/11/12 17:20:16 max Exp $
+.\" $FreeBSD$
+.Dd June 14, 2002
+.Dt NG_UBT 4
+.Os
+.Sh NAME
+.Nm ubt
+.Nd Netgraph node type that is also a driver for Bluetooth USB devices
+.Sh SYNOPSIS
+.In sys/types.h
+.In ng_ubt.h
+.Sh DESCRIPTION
+The
+.Nm
+node type is both a persistent Netgraph node type and a driver for
+Bluetooth USB devices. It implements a Bluetooth USB transport layer 
+as per chapter H2 of the Bluetooth Specification Book v1.1. A new 
+node is created when supported USB device is plugged.
+.Pp
+The node has a single hook called
+.Dv hook .
+Incoming bytes received on the device are re-assembled into HCI frames
+(according to the length). Full HCI frames are sent out on the hook. The node 
+will add HCI frame indicator if device did not send it. HCI frames received
+on
+.Dv hook
+are transmitted out. The node will drop HCI frame indicator unless device
+requires it to be present. 
+.Sh HOOKS
+This node type supports the following hooks:
+.Pp
+.Bl -tag -width foobar
+.It Dv hook
+single HCI frame contained in single
+.Dv mbuf
+structure.
+.El
+.Sh CONTROL MESSAGES
+This node type supports the generic control messages, plus the following:
+.Bl -tag -width foo
+.It Dv NGM_UBT_NODE_GET_DEBUG
+Returns an integer containing the current debug level for the node.
+.It Dv NGM_UBT_NODE_SET_DEBUG
+This command takes an integer argument and sets current debug level
+for the node.
+.It Dv NGM_UBT_NODE_GET_QLEN
+This command takes a parameter that specifies queue number and returns
+current maximal length of the queue for the node.
+.It Dv NGM_UBT_NODE_SET_QLEN
+This command takes two parameters that specify queue number and maximum 
+length of the queue and sets maximal length of the queue for the node.
+.It Dv NGM_UBT_NODE_GET_STAT
+Returns various statistic information for the node, such as: number of 
+bytes (frames) sent, number of bytes (frames) received and number of 
+input (output) errors.
+.It Dv NGM_UBT_NODE_RESET_STAT
+Reset all statistic counters to zero.
+.El
+.Sh SHUTDOWN
+This node shuts down when the corresponding USB device is un-plugged.
+.Sh BUGS
+Isochronous USB transfers are probably broken. It means that USB device 
+probably will not be able to transfer SCO data (voice). Driver does not 
+support firmware upgrade procedure. USB interrupt transfers are
+implemented as bulk-in transfers (not really a bug).
+.Sh SEE ALSO
+.Xr usb 4 ,
+.Xr netgraph 4 ,
+.Xr ngctl 8
+.Sh HISTORY
+The
+.Nm
+node type was implemented in
+.Fx 5.0 .
+.Sh AUTHORS
+.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com