Re: USB ethernet adapter modeswitch issue

On Sun, Feb 02, 2025 at 10:11:37AM -0800, Joseph Olatt wrote:
> On Fri, Jan 31, 2025 at 09:50:24PM +0100, MIZSEI Zolt??n wrote:
> > Hi,
> >
> > it comes up in ifconfig:
> >
> > cdce0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
> > lladdr MA:CA:DD:RE:SS
> > index 27 priority 0 llprio 3
> >
> > I assume, it would "just work" TM (c), but it switches to the mass storage rally quick, so I can't test my theory.
> >
> > I can eject the cd using "doas eject cd0", however it stucks in cd mode after this command, so while it really stops the switching back-and-forth it doesn't makes the hw usable :(
> >
> > -- ext
> >
> > On Fri, 31 Jan 2025 20:36:46 -0000 (UTC)
> > Stuart Henderson <stu.lists@spacehopper.org> wrote:
> >
> > > On 2025-01-31, MIZSEI Zolt??n <zmizsei@extrowerk.com> wrote:
> > > > Hi,
> > > >
> > > > i have got a cheap USB ethernet adapter for my ARM SBC running OpenBSD snapshot. If i connect it, it shows up as cdce, but then it automatically detaches and comes up as a usb storage device (it holds the the windows driver ). It does this repeatedly. Can I force somehow OpenBSD to ignore the mass storage device? DMESG below:
> > > >
> > > > uhub2 at uhub1 port 1 configuration 1 interface 0 "Terminus Technology USB2.0 HUB" rev 2.00/1.00 addr 2
> > > > cdce0 at uhub2 port 1 configuration 2 interface 0 "wch.cn USB 10/100 LAN" rev 2.00/7.34 addr 3
> > > > cdce0: address MA:CA:DD:RE:SS
> > > > cdce0 detached
> > > > umass0 at uhub2 port 1 configuration 1 interface 0 "wch.cn WCH UDISK_V1.1" rev 2.00/0.31 addr 3
> > > > umass0: using SCSI over Bulk-Only
> > > > scsibus4 at umass0: 2 targets, initiator 0
> > > > cd0 at scsibus4 targ 1 lun 0: <Flash, USB Special Disk, \\205`\\023> removable
> > > >
> > > > it repeats this in ~ every 30 sec.
> > >
> > > Does it stop doing it if you use eject(1) on the cd device? (I don't
> > > remember the exact syntax but try "eject cd0").
> > >
> > > You might need something else to actually make the ethernet work though -
> > > cdce is a generic ethernet class device and may or may not do something
> > > useful with your adapter.
> > >
> > >
> > > --
> > > Please keep replies on the mailing list.
> > >
> >
> >
> > --
> > MIZSEI Zolt??n <zmizsei@extrowerk.com>
>
> See if the following article applies/helps in your case:
>
> https://docs.netgate.com/pfsense/en/latest/cellular/hardware.html#mode-switching
>
>

The following *may* help as well:

https://www.draisberghof.de/usb_modeswitch/
https://www.baeldung.com/linux/usb-modems-communication

I'm suspecting your problem *may* have something to do with USB mode
switching. The source for it is at:

https://www.draisberghof.de/usb_modeswitch/#download