How to read data from MQTT message

Setup, Configuration and Use Beginners
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1

Hello,
I’m beginner in this stuff;)
I’m getting this code from mosquitto_sub:

{"Bediening":"2006-0310","Modus":"2006-0343","Cvretourtemp":"47","Cvaanvoertemp":"50","Zone1gemetentemp":"NaN","Zone1ingesteldetemp":"NaN","Zone1watertemp":"50","Zone2gemetentemp":"0","Zone2ingesteldetemp":"0","Zone2watertemp":"0","Dhwgemetentemp":"47","Dhwingesteldetemp":"47","Buffertanktemp":"0","Buitentemp":"0","Waterdebiet":"25.18","pompsnelheid":"3700","driewegklep":"2006-0950","Ruimteverwarming":"2006-0960","Tankverwarming":"undefined","Ontdooien":"2006-0300","Zon":"","Zontemp":"0","Bivalent":"","Foutstatus":"-","Compressorfrequentie":"75","Bedrijfstijd":"2916","Startstops":"3797","Ruimteverwarmingcapaciteit":"3","Ruimteverwarmingbedrijfstijd":"115","Tankverwarmingbedrijfstijd":"0"}

How to read this data to items?? I’m using MQTT 2.4 binding.
I have made Thing with channel
String with mqtt state topic “/panasonic/out” .
I added item:
String pompa_dane { channel="mqtt:topic:2da5c4d0:state" }
What now??

2

Is there a specific value you want? Or multiple of them? The easiest way is to create a channel for each of the values you need, and apply an “incoming value transformation” in the channel config. Use the JsonPath transform.

1 Like
3

@pacive Can You give me any example how it should look like??

4

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1.jpg1541×659 72.2 KB

I have made like this and nothing happens

5

Have you installed the JsonPath transformation service? I think you have written it correctly, and the expression is valid.

Is the thing marked as online?

6

yes JsonPath is installed, Thing is marked as online…
mosquitto_sub is still getting data but openhab not.
Other mqtt things is working normally.

7

If you skip the transform, does the item get updated?

8

no. It should get all data??? maybe stateTopis is different??

9

What topic did you use with mosquitto_sub?

10

panasonic/out

11

Then remove the / at the beginning of the state topic. It’s valid to have a slash in the beginning of a mqtt topic, but not recommended.

1 Like
12

Yeah Man!!! That was it;)

13

Great! Does it work with the JsonPath as well now?

14

YESS!!! :smile:
Thank You so much!

15

One more little problem;)

Number:Temperature pompa_dane_temp_zewn "Rzeczywista [%.1f °C]" <temperature> { channel="mqtt:topic:2da5c4d0:state" }

What is wrong? It’s not working. Still shows NaN

16

it is changing channel but not item.

2019-04-19 12:20:28.676 [vent.ItemStateChangedEvent] - mqtt_topic_2da5c4d0_state changed from 25 to 24

17

That is an Item that’s linked to the channel, that’s been created automatically, I guess you have simple mode enabled?
Anyway, what type is the channel? If you want to use a Number item, then the channel must also be of type Number.