Hello mcamara!
You could use our Thermal Raw Data that was added in a FW a couple months ago (I believe V5.2.3.30, x6 series only). Please have a look here for more info: Eventstream SDK: Thermal raw images and live stream
Other than that, unfortunately, I do not know a way to utilise a HTTP GET to pull the current TR temperature reading from the camera. If the above doesn’t answer your question - please try getting in contact via our official support mail so we can escalate your query (support-intl@mobotix.com)