I need a wakeup interval shorter than the standard 1800 sec. So I used the driver of Marc Cockcroft. Unfortunately, I faced two problems: The TRV sporadically set my desired short wakup interval (600s) to the default 1800s and sporadically fast setpoint changes failed.
So I started to modify the driver. My first solution was to always set in every wakeup cycle the desired wakeup interval as new. This stabilized the interval, but caused high battery consumption.
After that, I tried out other ways to stabilize the wakeup interval and I found a reliable solution for me. Additionally, there is a correction feature for the interval, if nevertheless a reset should happen. The setpoint changes work reliable for me. The battery consumption is low.
If you want to use this driver, it's advantageous first to use the standard "driver" to delete your old variables and states.
