Hi Charlie, the .dat file is a saved container for thetis. You can import from thetis opening a new container ans click to load.
When imported you have all the meter structure ready to personalize with your 4char id of thetis..
For this you have to go to mmio menu and add a udp server, your personal 4char id will appear here. If you already have the juma communicating you also will see the variables appearing in the right window.
I tried with nodered but due to my lack of knowledge i was unable to send command to juma via Thetis... But receiving it works with your flux.
Also i found that this system is less resource consuming and easier for people that haven't yet nodered.
Let me know if you need more details.
Regards
Luca