NG_BLUETOOTH(4) 					   BSD Kernel Interfaces Manual 					   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 Bluetooth variables.  All Bluetooth variables can be examined and changed via sysctl(8).

   Bluetooth Variables
     Below is the description of default variables.  Each Bluetooth 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 Command_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 results will be put in cache.  Later when a Bluetooth device establishes a baseband connec-
	     tion, 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 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.

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