Hi and welcome to the Bome community!
Ureachable usually means it is on the wrong network. Is you BomeBox ethernet on the same network as the CQ20B? Have you configured your A&H for the proper network address and netmask? I would need to see your ethernet settings for your BomeBox as well as you settings on your A&H (screenshots should help here).
First, thanks for your purchase! There are some example project file on our forum. This one shows how to use a CC on a Launch Control XL to control the CQ L/R level. You could use it as a model (along with the Allen&Heath CQ documentation) for constructing other actions.
You would normally run the project on Bome MIDI Translator Pro located on your computer for development, sending the output using Remote Direct MIDI to the BomeBox Allen&Heath port. Once you get it working on your computer through BomeBox , you should then be able to upload it to BomeBox for execution (after modifying the MIDI aliases).
You can learn more about aliases from this tutorial.
But first of all, we need to figure out why it is not connecting with the manual connection. I know the current version of the firmware does not auto discover the CQ, but that is OK as you should be able to manually connect. A newer version is in the works that should help discoving some of the newer Allen & Heath products using auto discovery.
Steve Caldwell
Bome Customer Care
Also available for paid consulting services: bome@sniz.biz