Hello Melanie,
Thank you for your detailed inquiry about your situation and requirements.
In this situation, if server IP/domain and Port are known, we can recommend to insert a SIM card into the device and set APN and Server data of device via FMBT mobile application "CONFIGURATION" tab. So, the data will be sent to the server until the device fitment and after it, if server data will not change.
Please let us know if you will have any questions.
Best Regards,
Teltonika Support