[android-developers] controling network devices via android app

Hi, in my network there are several (linux hosted) devices. now i want to control those devices via an android smartphone.
In the end there should be a general interface to the devices, so that everybody could build an app for it and control it.
How would you do this?
My first thought was, since on each device there is running a http server, to control the devices over http calls. (some kind of rest webservice?) This way i have an interface to my device and it could be easily extended to be reachable from outside the local network too.

What are the alternatives to communicate with devices in the network from android.
kind regards

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