After quite a bit of decompilation, reverse engineering, packet capturing and a few silent curses at Sony, I have some updated information for those who have tried the plugin to find that they cannot control their devices.
First off, the device against which the plugin was originally developed required NO authentication -- this applies mostly to 2013 and later models. Most likely those will work out-of-the-box so to speak once you enable remote control. However, some models produced (even today) require that you pair your device to the television in order to get access to network control. This is the "official" access method - same as Sony's TV SideView application uses, so it should be stable once established - and far better than the "spoofing" methods out there that did not work on many TV models. All that is to say that there are several other access/token methods out there and I don't know which models support which features or if all models support this, but have other options available. We shall see...
For those of you who found they could not control their televisions before, give this plugin "Release Candidate" a try. Once you device your device in Indigo, go to the Plugin's menu and under Sony Bravia Network Remote Plugin choose the "Pair to Device" option.
I can work with anyone individually that has issues or for which this doesn't work; several new features are built into the plugin to allow us to debug and figure out what will and won't work on your particular TV model. I have no real delusions that this will work on all models without some further tweaks -- but it should enable a MUCH larger range.
Thus far this has only been tested on TVs and one receiver (which didn't support this method for authentication). I am waiting to see if that user is able to get me some further details. However, if you have a receiver or Bluray for which this is not working, let me know and we can see if there is any way to add support (note this is MUCH easier if you have an Android device which can control your devices. Go Android! )
Release Candidate Download
Adam