Copyright (c) 2006 Itronix Inc.
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Written by Iain Hibbert for Itronix Inc.
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.Dd Apr 20, 2005 .Dt UBT 4 .Os .Sh NAME .Nm ubt .Nd USB Bluetooth driver .Sh SYNOPSIS .Cd "ubt* at uhub? port ? configuration ? interface ?" .Sh DESCRIPTION The .Nm driver provides support for USB Bluetooth dongles to the Bluetooth protocol stack.
p USB Bluetooth dongles provide two interfaces, both of which the .Nm driver claims. The second interface is used for Isochronous data and will have several alternate configurations regarding bandwidth consumption, which can be set using the hw.ubtN.config .Xr sysctl 8 variable. The number of alternate configurations is indicated by the value in the hw.ubtN.alt_config variable, and the isoc frame size for the current configuration is shown in the hw.ubtN.sco_rxsize, and hw.ubtN.sco_txsize variables.
p By default, configuration 0 is selected, which means that no bandwidth is used on the Isochronous interface and no SCO data can be sent. Consult the Bluetooth USB specification at https://www.bluetooth.org/ for complete instructions on setting bandwidth consumption. The following extract may be useful as a general guidance though details may differ between manufacturers.
p l -tag -compact -width XXX t 0 No active voice channels t 1 One voice channel with 8-bit encoding t 2 Two voice channels with 8-bit encoding, or One voice channel with 16-bit encoding. t 3 Three voice channels with 8-bit encoding t 4 Two voice channels with 16-bit encoding t 5 Three voice channels with 16-bit encoding .El .Sh SEE ALSO .Xr bluetooth 4 , .Xr uhub 4 , .Xr ubtbcmfw 4 , .Xr sysctl 8 .Sh HISTORY This .Nm device driver was originally a character device written by .An "David Sainty" and .An "Lennart Augustsson" . It was rewritten to support socket based Bluetooth access for .Nx 4.0 by .An "Iain Hibbert" . .Sh BUGS The Isochronous configuration can only be changed when the device is not marked up.
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