Minus temperature: device not responding making

[guussie]

No description provided.

[guussie]

I am trying to implement a Homekit device measuring the temperature inside a freezer. The temperature inside the freezer is obviously below 0 degrees Celsius. When I use this variable in the Publish function, I get a "device not responding" message in Homekit. When I use a negative int for testing, I get the same message, so apparently it has nothing to do with the float I am feeding into the Publish function. When I use a positive int, everything works. When I multiply the negative variable with -1, Homekit works (but shows the wrong value).

Can you please look into this?