The Lanbox does have a physical MIDI port but I don't think it supports MIDI over TCP/IP. In order to use MIDI I believe we would need MIDI hardware on the computer as well as a very long MIDI cable. We alternate shows between two different performance spaces in our building. In neither case is sound colocated with lighting. We use wireless LAN to control lights via TCP/IP from a laptop to the Lanbox. The sound computer running SCS gets directly cabled to the mixer which is nowhere near the Lanbox.
We use a single Lanbox to control lights in both rooms but separate mixers, amps, and speakers. Our DMX cable run from the Lanbox to dimmers is very roundabout daisy chaining dimmers in the two rooms, but even a direct cable run would require a couple hundred feet of MIDI cable. I've never worked with MIDI before and I don't know whether running a couple hundred foot cable would be a viable option.
I haven't looked for hardware yet so I don't know if a Ethernet to MIDI converter is something that's readily available. If we could go MIDI over the wireless LAN to some sort of converter box in the lighting booth and then just a short MIDI cable from the converter to the Lanbox that might be an option.