This package wraps ZWO's three device SDKs (the ASI camera SDK, the EAF focuser SDK and the EFW filter wheel SDK, from https://www.zwoastro.com/software/) and uses NuGet's multi-platform support to put the right native library beside any consumer.

Platforms: win-x64, linux-x64, linux-arm64, linux-arm, osx-x64, osx-arm64. Every library carries one name on every platform (EFWFilter.dll, libEFWFilter.so, libEFWFilter.dylib), which ZWO's own downloads do not (EFW_filter.dll on Windows); lib/SOURCE.txt names the downloads the package was built from.

6.0 is a breaking release. EFW1_7 is now EFWFilter and EAFFocuser1_6 is EAFFocuser, with the native libraries renamed to match, and win-x86 and linux-x86 are no longer shipped. 4.x and later target .NET 10+; the last .NET Standard 2.0 version is 3.x.

using static ZWOptical.SDK.ASICamera2, then ASIGetSDKVersion and ASIGetNumOfConnectedCameras; using static ZWOptical.SDK.EAFFocuser, then EAFGetSDKVersion and EAFGetNum; using static ZWOptical.SDK.EFWFilter, then EFWGetSDKVersion and EFWGetNum. DeviceIterator<TDeviceInfo> enumerates any of the three as TianWen.DAL device infos.

• Windows: the filter wheel needs no runtime. ZWO's EFW_filter.dll imports MSVCR90.dll, the Visual C++ 2008 runtime, through a side-by-side manifest, so it loads only where ZWO's installer or a 2008 redistributable put that runtime. The EFWFilter.dll here is linked from ZWO's own static library with a static runtime instead, and imports only Windows system libraries. tools/fetch-natives.ps1 builds it; tools/efw-wrapper/ holds its export list and the one shim the link needs. The EAF build is ZWO's Windows 10 one (Bluetooth over WinRT), not the Windows 7 one.
• Linux: libudev is loaded for the focuser and the wheel. Both libraries call libudev without declaring it, so the package loads it globally before either is used; a host without libudev cannot drive those two. The camera needs libusb-1.0.so.0. lib/udev/ holds ZWO's rules for /etc/udev/rules.d, needed to open the devices without root.
• Linux: EAF over Bluetooth is not packaged. ZWO's x64 EAF download also carries libWrapperSdbus.so and libsdbus-c++.so.2, the Bluetooth transport. libEAFFocuser.so does not depend on them, USB focusers work without them, and they are left out (issue #8).
• macOS: the camera needs libusb. libASICamera2.dylib loads libusb-1.0.0.dylib: on Apple silicon from Homebrew (brew install libusb), on Intel from beside the library. The focuser and wheel libraries need nothing.

Download the three SDK zips from ZWO, then run tools/fetch-natives.ps1 (Windows, with Visual Studio's C++ tools, for the wheel's wrapper) and commit what changed. It unpacks every platform, renames each library to its one name, builds EFWFilter.dll, checks that it imports nothing but system libraries, and copies the headers and manuals. Then compare the new headers with the bindings in include/: an enum member ZWO inserts renumbers everything after it.