Negative values for temperature change datatype to string instead of float

[XAct-6510]

The decoder for TTN changes the data type of negative values for temperature from float to string, which causes our JSON application to reject the data and record a NULL value. Please change the decoder so that the data type for temperature always remains float and thus retains the correct sign.

[mcmuller]

Yes, same here for all of my three S2120 on firmware 1.0
UPDATE: solved for me after switching from "device repository Formatter" to this custom one.