Re: [libusb] INVALID_PARAM when reconnecting to device after disconnect

[Dean S. <dea...@gm...>]

Tried a dumb thing.
The device I'm getting from the hotplug arrival event isn't usable.
I open a handle and make a few token attempts to claim the interface.
When that fails I close the handle.
Then I search for the device again and connect to that.

*Best Regards,*
*Dean Sands | Software Engineer *
Email: dea...@gm...  | Cell: 832 692 7411


On Fri, Jun 28, 2024 at 8:05 AM Dean Sands <dea...@gm...> wrote:

> Host:  aarch64 Linux 5.10.198
> libUSB:  v1.0.24.11584
> Client: CDC device with bulk endpoints
>
> Hi, libUSB,
> My goal is to connect to a device, then unplug it by hand after some time,
> then be able to reconnect it after I plug it back in.
> And it almost works.
> The hotplug callbacks are working fine, and I'm able to open the device
> and get a handle.
> However, the "new" device returns LIBUSB_ERROR_INVALID_PARAM when I try
> to do anything with the interface.
> Can I claim the interface? Invalid Param.
> Is the Kernel Driver attached? Invalid Param.
> Can I detach it anyway? Invalid Param.
> OK, maybe I need to set the configuration. LIBUSB_ERROR_BUSY. That's not
> good.
> Stopping the program and restarting works but that's not what I need.
> How do I reconnect?
>
>
> *Best Regards,*
> *Dean Sands*
>