Scale transformation service for negative numbers

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1

Hello,
I installed the Transformation Service and created the following WifiSignal.scale file:

[-65…]=4
[-75…-65[=3
[-85…-75[=2
[-95…-85[=1
[…-95[=0

In the Things Incoming Value Transformation field there is the following configuration:JSONPATH:$.Wifi.Signal∩SCALE:(WifiSignal.scale).

I can extract the RSSI value frm json, but the scale conversion don’t work.

Where is the mistake?

Thanks.

2

Is your thing an MQTT thing?

Your scale syntax doesn’t match any of the examples in the documentation. Are you sure it should work?

3

Yes, It is.

Ok, sorry in the correct file I have only two point, not three. I re-written the lines without copy them.
the right file is:

[-65…]=4 //From -65 (included) to up (included)
[-75…-65[=3 //From -75 (included) to -65 (not included)
[-85…-75[=2 //From -85 (included) to -75 (not included)
[-95…-85[=1 //From -95 (included) to -85 (not included)
[…-95[=0 //From minimum (included) to -95 (not included)

Is correct?

Thanks.

4

I tried to rewrite the file:

NaN=0
]-65..]=4       //From -65 (included) to up (included)
]-75..-65]=3 //From -75 (not included) to -65 (not included)
]-85..-75]=2 //From -85 (not included) to -75 (not included)
]-95..-85]=1 //From -95 (not included) to -85 (not included)
[..-95]=0      //From minimum (included) to -95 (not included)

now the not included value are the first and I added also the NaN conversion, but do not work…
Incoming Value Transformation, in Paper UI MQTT Things Channels is JSONPATH:$.Wifi.Signal∩SCALE:(WifiSignal.scale).

5

Try:

JSONPATH:$.Wifi.Signal∩SCALE:WifiSignal.scale

If that doesn’t work, perhaps try using the transformation as a profile for the Item itself?

1 Like
6

Yess, Now work!