which Communication mechanism need to use between

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Desktop application is written using QT C++ on Windows (Image ID app) Server is written using C++ language on Linux (Ubuntu) (server)

Image ID app upload images from file system and send these images to linux server and Linux server then store these images into Mysql databse

Question is How these 2 process which are running on window and Linux can communicate with each other?

Which protocol can be use or any kind of rpc mechanism can use ? please suggest .