I’m going to build a drone using PX4 as heart and RPi with LTE as companion computer.
I read from the documentation that I will be able to control the drone using the QGroundControl application and receive video from multiple cameras on my android phone or PC via Zerotier service and control it with a bluetooth Android controller (please confirm everything).
As you know, 4G connectivity is payable. In my country it is €10 for 5GB. 720p transmission for an hour uses about 2GB or something (1GB RPi and 1GB Android on the ground). Is there any solution to flying at close range (500m?) for free?
I suspect that it is possible to connect via Android and RPi through the built-in WiFi module. If so, is it possible to switch to LTE during the flight, and the other way while catching back WiFi coverage? And what will the range and video quality be?
There is a nice device on the market - “Herelink HD Video Transmission System”.
Is somewhere a cheaper option to create a similar long range WiFi bridge between the Android screen?
Please help me find a solution.