If you want to change TV channel or volume up - you can use TV remote control for Android! It’s free tool which can be used instead of physical TV remote control! Easy Universal Remote TV Control
simple application.It works with IR emitter or via WiFi for all smartphones or tablets.Go into setup to edit the default IP address.

Feature:

• Supports hundreds of TV models and phone models
• TV Remote Control User friendly interface.
• TV Remote Control Power on off button.
• Volume control button for tv remote control.
• Button for number of channels.
• Easy to use UI
• Many buttons

How To Use:
1.Open,check the WiFi signal of your android.
2.Turn on the TV from Power IR - Universal Remote Control application or the original plastic remote.
3.Check if your Smart TV connected to your local WiFi network.
4.You must insert the IP of your Smart TV into application.Go into your TV menu > Network > Network Status > IP Address.
5.You are ready to use it.