We bought 1 real Shelly Plus H&T sensor for $40.
As you can see from the screenshot
it sends JSON payloads, but very infrequently. In our case, after 6 minutes
So, every time we wanted a message, we needed to change the temperature.
To accelerate development, we used MIMIC.
This video shows the process in 2 minutes:
Money saved: $40,000. Time saved: immeasurable.