I’ve just posted an updated version, which should work for the SRT323 while Smartthings overcomes it’s current issues with heating only thermostats.
It has also been amended to get rid of some of the clutter from the “History”. There should now no longer be duplicate entries, except for the “Heating Temperature” or setpoint, which may appear twice, once when it is set in the app and once when it is actually implemented by the device, which may be a few minutes later.
I am aware of a current issue with History for all devices, which appears several hours late.
I cannot guarantee that ths will work for SRT321, but it will help to eliminate the issues which are currently affecting several thermostats.