The problem was that with version 7.1.0 of the library you need to call RNBOsproSetContactServer before calling RNBOsproFindFirstUnit. When I did this, I got SP_VERSION_NOT_SUPPORTED. I then updated the installed driver to 7.5.9 and it worked. It seems strange that the 7.1.0 version of the library is not supported by the 7.4.0 driver.
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