Incompatibility with baudrate-less serial drivers on Windows

[y3nd]

Like explained here for another software, some drivers requires that no baudrate is set for the serial port, otherwise the driver can crash an output an error, and ser2net is not usable.

Here is the error from the underlying gensio:

unhandled OS error in gensio_win_setup_comport:857: A device attached to the system is not functionning. (31)

This is the case for ublox F9x devices when using the integrated USB interface.

Proposed solution : allow to set the baudrate to None to be compatible with those specific drivers.

[cminyard]

There is already a "dev" gensio that I believe does what you want. So instead of serialdev, use dev.

[y3nd]

Using dev instead produces the same error. It looks like the DCB configuration is overconstraining the driver causing it to error out.

C:\Users\x\dev\tests\ser2net>ser2net -c ser2net.yaml -d -l
info: Unhandled OS error in gensio_win_setup_commport:857: A device attached to the system is not functioning.
 (31)

[cminyard]

Hmm. If you use dev, it shouldn't be calling that code. It seems that the device is advertising itself as a serial port, and that the windows code I have here is just trusting it; the information about whether it's "dev" or "serialdev" is not passed in. Fortunately, that can be solved pretty easily.

[cminyard]

Ok, I have pushed up a patch to the gensio repository that should solve this. Unfortunately, I cannot ultimately test it, as I don't have any hardware like that. Can you give it a try?

[cminyard]

Any news on this? I'd like to get a release out for a different issue, but I'd like to make sure this is fixed, too.

[y3nd]

Sorry I don't have the compilation setup right know so I won't be able to test it. I went developing an alternative using Golang and https://github.com/bugst/go-serial

I can try a prerelease or the release you want to publish.

[cminyard]

Ok, I went ahead and did a release of gensio 2.8.12 and ser2net 4.6.4. If you could test it, that would be great. I think I got everything, but I can't test and be sure. Sorry this didn't work out of the box for you.