If you run RasPlex (Plex on a Raspberry Pi), you have probably noticed that the latest version of the Plex iOS (iPhone/iPad) app is no longer compatible.
To deal with this I have quickly written a Plex remote which is accessible from any device with a web browser.
To use it, simply enter the hostname or IP address (e.g. plex.local or 192.168.1.15) of your Plex Media Server and then the IP address of the Plex client you wish to control.
Hopefully an update to RasPlex will be released soon to fix the incompatibility. In the mean time, this will do the trick!