Are you able to confirm if the Pi is getting telemetry? Go to the APWeb interface at http://10.0.1.128 and check if you’re getting telemetry there.
Both pymavlink and mavproxy are already installed on APSync. You can start mavproxy with mavproxy.py --master=udpout:10.0.1.128:14550
Both APSync and Rpanion-server are similar, in that they both offer: Wifi access point, video streaming, telemetry forwarding, web interface. Just different options.
Correct. Note that the Wifi link and SiK radio link are sending exactly the same data - MAVLink telemetry.
Yep, that’s definitely possible. You’d likely need to write the software yourself though, depending on what sort of existing software support there is for the exact sensor you’re using.