Restarting USB Bluetooth Dongles immediately Post: 302493561

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Top Forums Shell Programming and Scripting Restarting USB Bluetooth Dongles immediately Post 302493561 by cabrix on Thursday 3rd of February 2011 05:19:21 AM

02-03-2011

Registered User

Restarting USB Bluetooth Dongles immediately

Hi @all,

i am currently having a Problem:

I want to restart 2 USB Bluetooth Dongles from the shell at the same time. It is very important that they are restarted nearly simultaneously, so that their clocks are starting to run at the same time.

At the moment i am using a command called "bccmd -d hci0 coldreset" to restart the hci0 device and afterwards i am restarting the hci1 device with the same command. The problem here is, that as it seems, there is a very short random timedifference between these restarts and thus the clocks of the Bluetooth USB Dongle are not started at the same time.

I ve already tried to use "nice" to increase the commands priority but that did not help.

So does anybody have an idea how this simultaneous restart can be achieved...i would be really thankful for any help.

Thanks in advance for your help

cabrix

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LEARN ABOUT DEBIAN

ng_ubt

NG_UBT(4)						   BSD Kernel Interfaces Manual 						 NG_UBT(4)

NAME

     ng_ubt -- Netgraph node type that is also a driver for Bluetooth USB devices

SYNOPSIS

     #include <sys/types.h>
     #include <netgraph/bluetooth/include/ng_ubt.h>

DESCRIPTION

     The ubt 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 a supported USB device is plugged in.

     The node has a single hook called 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 a HCI frame indicator if the device did not send it.	HCI frames received on
     hook are transmitted out.	The node will drop the HCI frame indicator unless the device requires it to be present.

HARDWARE

     The ng_ubt driver supports all Bluetooth USB devices that conform with the Bluetooth specification v1.1, including:

     o	 3Com 3CREB96
     o	 AIPTEK BR0R02
     o	 EPoX BT-DG02
     o	 Mitsumi Bluetooth USB adapter
     o	 MSI MS-6967
     o	 TDK Bluetooth USB adapter

HOOKS

     This node type supports the following hooks:

     hook    single HCI frame contained in a single mbuf structure.

CONTROL MESSAGES

     This node type supports the generic control messages, plus the following:

     NGM_UBT_NODE_GET_DEBUG
	     Returns an integer containing the current debug level for the node.

     NGM_UBT_NODE_SET_DEBUG
	     This command takes an integer argument and sets the current debug level for the node.

     NGM_UBT_NODE_GET_QLEN
	     This command takes a parameter that specifies the queue number and returns the current maximal length of the queue for the node.

     NGM_UBT_NODE_SET_QLEN
	     This command takes two parameters that specify the queue number and the maximum length of the queue and sets the maximal length of
	     the queue for the node.

     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.

     NGM_UBT_NODE_RESET_STAT
	     Reset all statistic counters to zero.

SHUTDOWN

     This node shuts down when the corresponding USB device is un-plugged.

SEE ALSO

     netgraph(4), ugen(4), usb(4), ngctl(8)

HISTORY

     The ubt node type was implemented in FreeBSD 5.0.

AUTHORS

     Maksim Yevmenkin <m_evmenkin@yahoo.com>

BUGS

     Isochronous USB transfers are broken.  This means that the USB device will not be able to transfer SCO data (voice).  USB interrupt transfers
     are implemented as bulk-in transfers (not really a bug).

BSD
								September 13, 2004							       BSD