we still don’t know, what you did, which platform you use (except a raspberry pi) and what your specific problem is. If you expect more help from us, please have a look here:
currently we cannot help you, because you seem to mix different aspects, but we cannot assume your environment and what steps you did and what you already tried to solve your problem.
As a really good starting point, as you are new to openHAB, please take your time to have a look at the documentation and of course as you’re using raspberry Pi as platform it’s highly! recommended to start with openHABian: