I’ve just finished a change to the Onkyo binding. I’ve added a rule action that can be used to send raw eISCP commands to the receiver, so everyone is able to send commands that are not directly supported by the channels on the binding.
I use this action to change the volume level on the center channel when watching movies because most movies have low volume on the center channel. And If I want to watch a movie during the night I can compensate for this without having to raise the main volume too much and without having to search through all the menus to change this.
Please see the chapter “Rule Actions” in the readme how to use this: https://github.com/TheNetStriker/openhab2-addons/tree/OnkyoThingAction/addons/binding/org.openhab.binding.onkyo
And here is a link to the new binding: https://www.dropbox.com/s/t6jhsn0ysnhy1nd/org.openhab.binding.onkyo-2.5.0-SNAPSHOT.jar?dl=0
I hope to find some testers for this because this would help getting the changes merged into the main Openhab repository.