hi: Use ssh or vnc to connect smart phones to PCs or single board systems. Servers and clients are available
in the repos.
ssh ----- openssl (client and server)
vnc clients ----- remina, tightvncviewer tigervncviewer
vnc server ----- xtightvncserver and more -just google it
For smartphones you can find several ssh and vnc clients and even servers at the google appstore or in
apk websites outside the google world.