For the TV service Horizon from UPC Cablecom, mobile use has so far only been possible on Apple devices with the iOS operating system and one hears again and again that apps for Android and Co. are already in development. A date when these will be available has not yet been set. With these, television and video-on-demand can then also be used on the PC, smartphone and tablet. The viewer has access to TV channels and the Horizon video library without a cable receiver. But unfortunately UPC keeps its customers waiting and so has Herrser.com got down to it and programmed a Horizon remote control for Android.
The app is an alpha version and suitable for devices with Android 4.x. This works flawlessly on a Google Nexus tablet and the Samsung Galaxy S3 and is faster than the original remote control! If you want to test the app at your own risk, you have to proceed as follows:
In order for the APK to be installed at all, you must allow “unknown sources” on your smartphone. This option can be found in the settings of the Android device. Usually under “Settings => Options => Security => Unknown Sources” you put a tick there to allow apps to be installed from sources other than the Google Play Store. With newer models, a warning message will now be displayed, which you must confirm with OK. Now you can open the app the Herrser.com website on XDA download and install.
In the app in the “Settings” you must now create a new controller, assign a name to the controller and enter the IP address of the Horizon Box. The IP can be found on the Horizon in the “Options => Settings => Network Settings => Network Diagnostics => IP Address” area. Now enter this into the app. You can then leave the “Settings” again and select the name of the controller you just created in the app. The remote control appears and if everything was done correctly, a green circle appears on the top right of the remote, which signals the successful connection. If there is no connection, the circle appears in red with a corresponding message.
Although the app is an alpha version, it works excellently and you can now conveniently operate your Horizon using your smartphone via W-LAN. Have fun with it!
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The app is still available from XDA: https://forum.xda-developers.com/showthread.php?t=2468149 but remember, that was forever and four years ago and the app worked with the old Horizon at the time, but was never further developed and I don't know whether it still does it today ......
Thank you for your answer.
I noticed that the app is older, but I'll try my luck. 
May Fortuna be with you?
Thanks, but of course it didn't work. Of course the app doesn't work. The official app has a remote control, but in Austria only for the Media Box, not for the Horizon. In Germany and Switzerland they have the remote control for the Horizon, but not for the Media Box. Very strange…
Thanks for the feedback, it's a shame it didn't work out….