Use external keyboard without mouse in Android OS

Dear friends, I have attached external keyboard to my android mobile successfully, and I have to operate my android mobile by external keyboard only means without mouse.
Now there are two options one is to operate mobile through shortcut keys of keyboard like arrows key, tab etc. On this way I can select and open app but I can not select and click some buttons of app, this is a problem.
Now second options is that move cursor (pointer of mouse) directly by keyboard with the help of numerical keys of keyboard, this is possible in window OS by doing some change in control panel. But I don't know how to do in android OS.
Actually I am making a home security system and I require operate android mobile by keyboard only.
Please guide me , please, please.

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