Already had that setup before.
This is how my astra.toml looks like:
# trace, debug, info, warn, error, fatal
level = "error"
console_output = true
file_output = true
#path = "Plugins"
OrbbecBodyTracking.dll is located in sub-folder Plugins as you mentioned.
I tried changing path to ".\Plugins", ".\Plugins\", and "C:\Users\vitom\Documents\Visual Studio 2015\Projects\astra-joint-tracking\x64\Debug\Plugins" which is complete local path to Plugins folder but nothing changed.
I'm still not receiving any frames after starting body stream, and OrbbecBodyTracking.dll is still unloading right after loading.
My folder where dll's are looks like this:
Also I've tried starting other streams without BodyStream (for example DepthStream and HandStream) and everything works perfect. But as soon as I start BodyStream in application, no frames will be ready.