Welcome @1231 to the Forum.
Have you carried out a search for Teltonika on the Forum. There are several threads describing communication between Node-RED and Teltonika devices.
I recommend watching this playlist: Node-RED Essentials. The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.
A quick search shows this thread, which might help. You also might want to read your Teltonika (insert Device Name here), to see what communications options are available to you.
