Basically, almost any controller can be connected with Bluetooth. My XBox One controller does it too. Gamesir is not particularly well suited either. Just particularly cheap... ;)
Hello everyone. It's me again. I have found out how to do it:
1. switch on Bluetooth on the iPhone
2. switch on GameSir > press and hold until the blue dots flash.
3. switch on the GameSir app
4. click on "Search for Controllers" > the blue dots now light up.
Wait until the calibration is complete (if necessary, carry out the calibration yourself).
6. switch to the app "Settings" on the iPhone.
Switch on Tello and hold it close to the iPhone.
8. switch on the WLAN on the iPhone and click on the "Tello app" button.
9. activate the Tello app on the iPhone
10. large circles appear on the display
Press the small "PAIR" button on GameSir.
12. press Tello app > "Settings" > "Disconnected" > now both big circles are gone > click screen
13. start: press keys R2+Y on GameSir simultaneously
14. attention:
- Tello is only slightly suitable for wind
- Observe short flight times
- Avoid distances over 80 metres
15. after battery change > reactivate the Tello in the WLAN
Now you are ready to go.
Have fun
Difficult to answer. One would have to try. However, I have the impression that there will probably be compatibility problems. That's why this controller can only be used for the Tello drone. At least that could be one of the reasons.