@Eric-Katzfey
Thanks for your reply! I am not attempting to establish communication via UART. I have already successfully been communicating the the FC/PX4 via WiFi, ethernet, and USB-C through the ADB shell (link). What I am talking about doing in my post is fundamentally different. I have an ELRS receiver plugged into J19 on the VOXL2. As mentioned in the above post, I have verified that the ELRS receiver/transmitter works for RC inputs over CRSF.
What I am trying to get working now is using the transmitter for QGC connection. This is possible on other flight controllers by connecting to the transmitter's local WiFi or via USB, but this does not seem to be working in the same way for the VOXL2. I imagine I am missing a specific configuration option or setting somewhere, or maybe this just isn't possible since Mavlink seems to be only communicated via UDP on this device. That is what I am looking for clarity on.