Can I use my Android device as remote control for my SmartTV?
There are multiple possibilities to remote-control your Samsung TV with your Android device. For one, there are a bunch of Samsung TV remote control apps giving you a wide range of choices.

A second variant would involve FHEM on your PC (this is a home automation software, and there's a module available for Samsung TVs – I use this, so I can vouch for it) and, optionally, the andFHEM Android app. This way you cannot only use your Android device, but any device with a web browser to remote control the TV – and even integrate it with some other (home) automation stuff. For example, using tasker you could have your TV turned off (or mute it) whenever you receive a call on your Android device – or turn it on as soon as your device connects to your local WiFi. Much more is possible, of course :)