Cloud API - MQTT - RTMP

Hello, we're developing an app that basically will alert the user when the detected temperature goes above a certain temperature threshold.
We currently have issue with the thridparty-server docker to install and we're trying to figure out:
- do we really need a standalone server between the drone and our program? Can't we just have information directly from FlightHub?
- we need to grab info about the drone (position, highest temperature) and what the drone is seeing (RTMP feed from camera) and then attach the drone info on the video but of course the 2 streams might have different delays, is there any information given from the server that might help us sync the 2 streams?
- is using the cloud API the only way to achieve this?