To transmit telemetry, we need to configure Mission Planner:

Connect to MissionPlanner.

Go to Setup/Advanced, click on Mavlink Mirror and enter the required parameters (IP address 78.193.54.121 — use the one you received at the beginning. Make sure to check the Write checkbox).

Click GO. (If it doesn't connect, either you don't have a VPN connection or the specified data is incorrect (Host or Port)).