Thank you very much for the detailed information.
I turned on the logs, but will turn off as you advise, to avoid card damage
It turned out that the problem was in the router! I moved it besides a Bluetooth emitter that was ruining the wifi signal when TV was on!
Everything is working fine now, I am working on tweaking the thermometer and HestiaPi’s display to show temperatures one besides the other. My idea is HestiaPi looking after the ANAVI thermometer termperature when we go bed, and coming back to its own temperature when we wake up.
I will release the software and post a blog entry the results!