The question I really need answered, in a nutshell, is what is Microsoft's sanctioned way to write OID data from user mode IoT, and where is it documented?
Here's the background:
A while back the topic of sending OID data came up in this thread:
I'm porting some software from Windows CE to Windows 10 IoT Core, and there's a user-mode component that needs to be able to send OID data down the NDIS stack. There seem to be two general approaches to this:
In the original thread, Doron Holan stated, "there is no WMI on IoT." If true, that takes option 1 off the table.
Option 2 is a little strange in that I've only seen this documented for Windows CE. There is a driver named ndisuio.sys on Windows 10 desktop as well as Windows 10 IoT Core, but I have found no documentation on the web nor supporting headers in the SDK.
There's a ndisprot sample at: https://github.com/Microsoft/Windows-driver-samples/tree/master/network/ndis/ndisprot/6x
Thinking that ndisuio.sys might be very nearly the same, I attempted to use ndisuio.sys with the IOCTLs and structures defined in that project, but with no success. From browsing the binary in a hex editor, I guessed that I might be able to call CreateFile() with either \\.\WwanProt or \\.\NdisUio as the device name; the former succeeds, the latter fails with a file share error code regardless of the file share parameters passed in. Beyond that point, though, I can't get an open via DeviceIoControl()/IOCTL_NDISUIO_OPEN_DEVICE to work when the adapter GUID is passed in (I get a general failure error back).
But let's step back a moment; this is silly. Reverse engineering Windows to find undocumented ways to do things is no path towards a stable application.
There is a third path available to me, I think, and that is to take the ndisprot sample and create my own parallel of the ndisuio.sys driver. It seems like a lot of messing around to do something simple that the OS supports internally, but it's at least a path that isn't explicitly unsupported.
My apologies if I've overlooked something obvious.
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