.\" $NetBSD: umb.4,v 1.2 2018/08/01 17:28:42 wiz Exp $
.\"
.\" Copyright (c) 2016 genua mbH
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.Dd August 1, 2018
.Dt UMB 4
.Os
.Sh NAME
.Nm umb
.Nd USB Mobile Broadband Interface Model (MBIM)
.Sh SYNOPSIS
.Cd "umb*  at uhub? port?"
.Sh DESCRIPTION
The
.Nm
driver provides support for USB MBIM devices.
.Pp
MBIM devices establish connections via cellular networks such as
GPRS, UMTS, and LTE.
They appear as a regular point-to-point network interface,
transporting raw IP frames.
.Pp
Required configuration parameters like PIN and APN have to be set
with
.Xr umbctl 8 .
Once the SIM card has been unlocked with the correct PIN, it
will remain in this state until the MBIM device is power-cycled.
In case the device is connected to an "always-on" USB port,
it may be possible to connect to a provider without entering the
PIN again even if the system was rebooted.
.Sh HARDWARE
The following devices should work:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Ericsson H5321gw and N5321gw
.It Fibocom L831-EAU
.It Medion Mobile S4222 (MediaTek OEM)
.It Sierra Wireless EM7345
.It Sierra Wireless EM7455
.It Sierra Wireless EM8805
.It Sierra Wireless MC8305
.El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr usb 4 ,
.\" .Xr hostname.if 5 ,
.Xr ifconfig 8 ,
.Xr umbctl 8
.Rs
.%T "Universal Serial Bus Communications Class Subclass Specification for Mobile Broadband Interface Model"
.%U http://www.usb.org/developers/docs/devclass_docs/MBIM10Errata1_073013.zip
.Re
.Sh HISTORY
The
.Nm
device driver first appeared in
.Ox 6.0
and
.Nx 9.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Gerhard Roth Aq Mt gerhard@openbsd.org
and ported from
.Ox
by
.An Pierre Pronchery Aq Mt khorben@defora.org .
.Sh CAVEATS
The
.Nm
driver does not support IPv6.
.Pp
Devices which fail to provide a conforming MBIM implementation will
probably be attached as some other driver, such as
.Xr u3g 4 .