@dc42 @Foosel suggests the format should be:

Recv: ok T:195.0 /195.0 T1:188.6 /190.0 B:60.0 /60.0

https://github.com/foosel/OctoPrint/issues/2590

monkeypantman created this issue in foosel/OctoPrint closed No longer recognising second tool temperature on dual extruder from M105 query #2590