Unity additional Device controller

My idea is to connect a Desktop Unity app with a device like iPhone or Android. For a start I'd like to have a simple button on my device, that on click event will change something in desktop app (for example change the text, or increment clicked times). I have two scripts for starting a master server and another one to connect to the room. Now somehow I need to send a click event to the server, and move the client app to an mobile device. Any help?