Smarthome has a module called the Templinc.
It has varried modes. Like report changes in
temperature. Polled for the temperature are
two. The tempearture reported back is in the
form of a unit code and dim level. So
interpetation of the data is needed. If you
want to give it a look is PN:1625 Manual is
downloadable to read and decide if it will
do anything you need.
www.smarthome.com/1625.html