I am an Android Developer Having 3 Years of Experience .. I Developed 80+ Mobile Apps. I can write same app as your requirements are.. please msg me if you need High Quality App
I have 2 android applications live on Google Play Store, i have already served clients from South Africa and they are happy with my work. i will develop an app which will be easy to expand for you in long run.
I'm not sure what you want to do but I have quite a bit of experience developing android apps. I have also already made an app that can extract info about other devices connected to the same wifi network as your device (such as ip address and mac address).