Hey!
Unfortunately, because of architectural and protocol differences, Teltonika Networks devices are not compatible with Teltonika Telematics tracking devices (FMB series).
Regarding the Teltonika free server. I have checked internally, and it seems that Teltonika Networks does not provide such services, but since most of the equipment on that website is from Teltonika Telematics, I would suggest contacting their support directly here for further help.
Best regards,
Domas