I'm currently working on a driver for the Radio Thermostat CT-80, which uses the API. Because it uses the API, it's a possible universal driver for all Radio Thermostat models. I've based mine on Sean's (aka WhateverFits) excellent 3M50 driver (thanks for the great work Sean!), and updated it for the additional capabilities of the CT-80 plus other API features which should work with other models. There's been a bit of discussion in this thread: http://forum.linuxmce.org/index.php/topic,13336.0.html
In order to try and make this a universal driver, I'm hoping some other Radio Thermostat owners could do me a favor, and post the results of a few URL's off of your thermostat. That way, I can make sure I don't break anybody's usage of their thermostats if they try my driver. . So, if you have a 3M50, a CT-30, or a CT-80, if you could post the results of some URL's, it would let me make sure that I'm not making assumptions on the capabilities of the various models, as the API docs don't go into enough specifics as to what devices have which capabilities.
You should be able to use a web browser, and just paste the URL's into the browser address bar. I'll also post a curl version people can run from the core via command line. Just substitute the xxx with the proper address of your thermostat (or the full IP if you're not using the normal subnet range for the LMCE network)
Thanks for your assistance with this!