Need simple example showing how to apply dcb settings from the application

[jerrywrice]

I'm a relative novice using type conversion operators (such Into) with rust.

Could you add an example source file that applies port settings using the DCB under Windows? To be clear, I understand how the serial DCB fields work with Windows serial ports, but don't know how to accomplish this from a rust application using the serial2 crate.

Thx

[de-vri-es]

Is there anything from Settings you're missing? Do you want access to the raw DCB structure?

[jerrywrice]

Maarten,

Thanks for replying, and for publishing and supporting this crate.

My app needs to customize the Windows Receive timeout configuration, based on the device I’m controlling. In various scenarios I need to set different DCB ReadIntervalTimeout, ReadTotalTimeoutMultiplier, and ReadTotalTimeoutConstant DCB field values. I haven’t found a way to do this without modifying the crate interface. Is there a way to update the raw DCB from outside the crate library - from a client application?

From: Maarten de Vries @.> Sent: Tuesday, October 10, 2023 10:53 AM To: de-vri-es/serial2-rs @.> Cc: JWR_FABNexus @.>; Author @.> Subject: Re: [de-vri-es/serial2-rs] Need simple example showing how to apply dcb settings from the application (Issue #16)

Is there anything from https://docs.rs/serial2/latest/serial2/struct.Settings.html Settings yuo're missing? Do you want access to the raw DCB structure?

— Reply to this email directly, view it on GitHub https://github.com/de-vri-es/serial2-rs/issues/16#issuecomment-1755948028 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AEHOLCQQKVO4KJX5NW3UTULX6WDOFAVCNFSM6AAAAAA5XJA76WVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONJVHE2DQMBSHA . You are receiving this because you authored the thread. https://github.com/notifications/beacon/AEHOLCUGG265SJWZ5SSCTP3X6WDOFA5CNFSM6AAAAAA5XJA76WWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTTIVGR7Y.gif Message ID: @. @.> >

[de-vri-es]

Hey! Currently there is indeed no way to access the raw DCB fields or the timeouts. Do note that the timeouts are not in the DCB struct, they're in the _COMMTIMEOUTS struct, which requires a separate set of syscalls to manipulate.

I am interested in exposing platform specific configuration parameters, but there are some challenges with that. Would it suffice for your application to just set the read/write timeout (ReadTotalTimeoutConstant)? Because that is already exposed through set_read_timeout().

Note that setting ReadIntervalTimeout and ReadTotalTimeoutMultiplier will cause read() to return no data if the timeout is reached, not even whatever data has been received so far. This is normally a big problem, so you should be careful when using these settings.

[jerrywrice]

Maarten,

Yes, I'm familiar with those Windows data structures. I was a bit rushed with I formulated my earlier email.

I recently collaborated and volunteered time/effort to supplying updates to those setting fields for the ‘serialport-rs’ crate. Unfortunately that crate’s support team is very preoccupied with other things besides that crate – something I’m sure you must contend with as well (we’re all volunteers!). But after almost six months of roughly 20 hours per week assisting that crate’s support team I concluded things were moving too slow. Recently someone referred me to your crate, which is why I began experimenting with it about a week or so back.

Let me know if you have a need/interest in adding to your open source volunteer support team – I have some time as I’m semi-retired. Regarding my background, I’ve been using rust for some in-house projects for about a year now. IMO it’s a great system’s development language, one of the best I’ve encountered in my career. You can check out my technical resume on my web-site (URL below).

From: Maarten de Vries @.> Sent: Wednesday, October 11, 2023 12:34 AM To: de-vri-es/serial2-rs @.> Cc: JWR_FABNexus @.>; Author @.> Subject: Re: [de-vri-es/serial2-rs] Need simple example showing how to apply dcb settings from the application (Issue #16)

Hey! Currently there is indeed no way to access the raw DCB fields or the timeouts. Do note that the timeouts are not in the DCB struct, they're in the _COMMTIMEOUTS struct, which requires a separate set of syscalls to manipulate.

I am interested in exposing platform specific configuration parameters, but there are some challenges with that. Would it suffice for your application to just set the read/write timeout (ReadTotalTimeoutConstant)? Because that is already exposed through https://docs.rs/serial2/latest/serial2/struct.SerialPort.html#method.set_read_timeout set_read_timeout().

Note that setting ReadIntervalTimeout and ReadTotalTimeoutMultiplier will cause read() to return no data if the timeout is reached, not even whatever data has been received so far. This is normally a big problem, so you should be careful when using these settings.

— Reply to this email directly, view it on GitHub https://github.com/de-vri-es/serial2-rs/issues/16#issuecomment-1757023230 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AEHOLCX7JRETDY3WEL5QWS3X6ZDX3ANCNFSM6AAAAAA5XJA76U . You are receiving this because you authored the thread. https://github.com/notifications/beacon/AEHOLCU676XV7CCUB43YFNDX6ZDX3A5CNFSM6AAAAAA5XJA76WWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTTIXIF74.gif Message ID: @. @.> >

[de-vri-es]

Hey! As mentioned, I do want to support access to platform specific features.

It's currently open in #18. Could you have a look to see if it fits your needs?

[jerrywrice]

Your latest merge of pr #18 into main resolves my request. Thx.