This is a simple application that initialy was designed in order to make "GET" requests to an Arduino UNO, which is connected to the motherboard of a Desktop computer, thus turning on the computer remotely. It is pretty clear that the security concerns are huge but if you keep the address and port of the Arduino only for your self then you can be safe on some level.
This application uses the org.apache.httpcomponents:httpclient:4.5 library which is tested with the android SDK 22. (Yeah i know this application is old. Is the first Android application that i have created. :P)
This is a screenshot of the application:
