It’s absolutely possible to run two Advanced Electronics Packages (Raspberry Pi + Pixhawk + Fathom-X) on one tether. You will, however, have to adjust some of the settings on one of the setups. You’ll have to change the IP address so that the Raspberry Pi is on a different address like
192.168.2.3 and also the ID of the Pixhawk so that it shows up as a separate vehicle in QGC.
You actually don’t need a network switch either because the Fathom-X boards can be operated in parallel. You can attach two boards to the same twisted pair on the vehicle and they can coexist.
That said, we can eventually add speed control to the external motors on the servo channels so that none of this is necessary. I’ll file that as an issue on Github so that we can get to it soon.