Hello Paskual86,
Thank you for reaching out to us regarding your questions.
The NatNet SDK does require our software, which acts as the server. There is, unfortunately, no way to simulate the server; you will need a license for our software.
The error code you are receiving is likely related to the missing server. Without our software, there is nothing to connect to and the connection will fail.
If you are considering a simple tracking solution, you can try one of our tracking bars. Either the V120:Duo or V120:Trio will act as a license for our software, so you would then have our camera tracking as well as the required software.
https://optitrack.com/products/v120-duo/
https://optitrack.com/products/v120-trio/
Best,
Steven
--
Steven Andrews
OptiTrack | Senior Customer Support Engineer
help.naturalpoint.com
support@optitrack.com