Splitting data advice

[gregoinc]

Hello,

I am receiving some data from an aqara temperature sensor and I really want to extract just the temperature data to send to my blynk app. Here's what I have setup...

Here's the code from the json node... kindly supplied by a person on another forum.

[{"id":"f91c0961d1a8d7db","type":"inject","z":"14ca354715bc92f3","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"battery\":100,\"humidity\":56.09,\"linkquality\":111,\"pressure\":1040,\"temperature\":21.35,\"voltage\":3065}","payloadType":"str","x":230,"y":640,"wires":[["b1664fd5d8d9d187"]]},{"id":"ed0a70bcd258ea58","type":"debug","z":"14ca354715bc92f3","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":550,"y":640,"wires":[]},{"id":"b1664fd5d8d9d187","type":"json","z":"14ca354715bc92f3","name":"","property":"payload","action":"","pretty":false,"x":400,"y":640,"wires":[["ed0a70bcd258ea58"]]}]

And here's the output from the json code...

So all I need to do now is extract the temperature: value so I can send it to my blynk app.

Any advice appreciated.

[E1cid]

You do not need the json node. You can set the mqtt node to output a json object.
The documentation has information on how you can move and set message properties using change, function and template nodes here.
https://nodered.org/docs/user-guide/messages

[gregoinc]

Hi E1cid, thanks for guiding me to that info, much appreciated. I will watch the videos and read the info. I figure all I need to do is add a switch, and then redirect the temperature data.

I've added a switch, see below...

And configured it this way...

Will see if that sends any data, but so far haven't seen anything.

[bakman2]

How are you sending messages to the "blynk app", i assume you use a specific node for this ?

The switch node is used to "route" messages to different paths depending on their properties. This is different from your needs: you want to extract a value, you can use a change node for this.

This depends on the output destination (your blynk node) - read the documentation for that node about the input it accepts.

[E1cid]

As said the json node is not required.
the switch will direct/filter messages down different routes
the change node moves/sets and changes msg properties

have a look at this example

[{"id":"cf17e5bc.7a6888","type":"inject","z":"c791cbc0.84f648","name":"simulate data","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"humidity\":70,\"temerature\":19}","payloadType":"json","x":170,"y":660,"wires":[["84e13593.cc088"]]},{"id":"84e13593.cc088","type":"switch","z":"c791cbc0.84f648","name":"","property":"payload.temperature","propertyType":"msg","rules":[{"t":"btwn","v":"0","vt":"num","v2":"25","v2t":"num"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":360,"y":660,"wires":[["aac72a22.0b5218"],["f775d2e6.87572"]]},{"id":"aac72a22.0b5218","type":"change","z":"c791cbc0.84f648","name":"","rules":[{"t":"move","p":"payload.temperaure","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":610,"y":640,"wires":[["ff12e9c2.911248"]]},{"id":"f775d2e6.87572","type":"debug","z":"c791cbc0.84f648","name":"other stoff with data","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":690,"y":700,"wires":[]},{"id":"2e754cab.2110b4","type":"mqtt in","z":"c791cbc0.84f648","name":"set to output object","topic":"a/topic","qos":"0","datatype":"json","broker":"d675b749.04b9c8","x":200,"y":720,"wires":[["84e13593.cc088"]]},{"id":"ff12e9c2.911248","type":"debug","z":"c791cbc0.84f648","name":"temp","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":870,"y":620,"wires":[]},{"id":"d675b749.04b9c8","type":"mqtt-broker","name":"Localhost","broker":"localhost","port":"1883","clientid":"","usetls":false,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""}]

Press ctrl I , paste code and click import.

[Colin]

@bakman2 I think you meant Move msg.payload.temperature To msg.payload, or Set msg.payload To the value msg.payload.temperature.

[bakman2]

Yes you are correct it was early and still mix it up.

[gregoinc]

Hi E1cid, that worked really well, thank you so much for your help. I really appreciate the guidance as I am not that up to speed with json code. Thanks again.

@bakman2 thank you for your help, all of this assistance really makes this forum such a great place.