Sinamics I will tell you my tcp low latency secret... don't share it too much...
I feel bad knowing and not letting people know.
It is tcp based tunneling web profile. It I will host and proxy your connection, which lifts ALL restrictions...
Instal on Pi, open wanted TCP ports to Remot3.
Form your ground station you open the website and press connect on wanted "port", let say ssh or video feed or RC control port
Remot3 will take date from Pi tunnel and generated proxy for connection address and port for you.
Copy past them into your ground station and you there you have.
It is not a web based server, it is like a web router, it provides you a link to directly connect to Pi created tunnel. Something like reverse tunneling with web based GUI and installer.
It take no time to set up, so you should try it.
Works extremely well for real time control of the drone over 4g
Video feed is still under examination