Hi @mtbsteve! Thanks for your help 
I’m working with Niharika on this.
We don’t actually have ApSync – just Raspbian (Stretch Lite) configured to connect to our network and stream its Pi camera over UDP.
We’ll have a look at the cables but last we checked we were getting ~3V on the TX and RX so I’d assume they’re still soldered on.
We have the stock cube but updated to Open Solo – if that makes a difference.
As for our use case, it is related to this other post.
TL;DR: we aim to operate multiple drones as a swarm over a network and we need all the UAVs to be connected to that same network as clients as opposed to our GCS connecting to wash UAV network.
I imagine we could tinker with the IMX code but it seemed easier to slap a RPi on it to start out. We will also want to connect a Flir One or Seek thermal, and one person reported no being able to build the Flir loopback driver on IMX due to kernel compatibility issues.