The M105 response look like this:
Recv:16:27:02.882: T:255.14/255.00 B:85.07/85.00 X:52.54/36.00 A:50.21/0.00 @:126 B@:127 C@:35.09 HBR@:255
The C@:temp is definitely the chamber temperature. I have checked this several times. The Core One does not have active chamber heating. Therefore. I only see the current measurement.
I had a look to the github page of the firmware. There are some discussions about this. It seems it's a bug in the firmwar:
https://github.com/prusa3d/Prusa-Firmware-Buddy/pull/4671
So anyway: Is there an option to parse the value myself as long it is not solved?